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all geography including DSDP/ODP Sites and Legs
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Africa
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Congo (1)
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East Africa
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elements, isotopes
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Os-188/Os-187 (6)
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Rb-87/Sr-86 (1)
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radium
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Sr-87/Sr-86 (48)
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aluminum
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Saurischia
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Pterosauria
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Synapsida
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Testudinata (1)
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Insecta
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Echinodermata
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Textulariina
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Wisconsinan
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Woodfordian (1)
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Siwalik System (4)
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Tertiary
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Arikareean (3)
-
Asmari Formation (1)
-
Catahoula Formation (2)
-
Challis Volcanics (2)
-
Cypress Hills Formation (2)
-
Florissant Lake Beds (3)
-
John Day Formation (6)
-
lower Tertiary (8)
-
middle Tertiary (1)
-
Neogene
-
Bidahochi Formation (3)
-
Hemphillian (5)
-
Miocene
-
Ash Hollow Formation (4)
-
Barstovian (2)
-
Calvert Formation (1)
-
Clarendonian (3)
-
Columbia River Basalt Group (1)
-
Fleming Formation (2)
-
lower Miocene
-
Aquitanian (1)
-
Burdigalian (1)
-
Hemingfordian (1)
-
Kasauli Series (1)
-
-
middle Miocene
-
Badenian (1)
-
-
Paintbrush Tuff (1)
-
Pebas Formation (1)
-
Puerto Madryn Formation (1)
-
Temblor Formation (1)
-
upper Miocene
-
Modelo Formation (1)
-
Santa Margarita Formation (2)
-
Tortonian (3)
-
-
Valentine Formation (1)
-
-
Ogallala Formation (9)
-
Pliocene
-
lower Pliocene (4)
-
upper Pliocene
-
Rexroad Formation (1)
-
-
-
upper Neogene (1)
-
-
Paleogene
-
Calvert Bluff Formation (1)
-
Chadron Formation (5)
-
Claron Formation (1)
-
Duchesne River Formation (2)
-
Eocene
-
Absaroka Supergroup (3)
-
Bridger Formation (2)
-
Bridgerian (3)
-
Chuckanut Formation (1)
-
Clarno Formation (1)
-
Colton Formation (1)
-
Ghazij Formation (1)
-
Golden Valley Formation (4)
-
Green River Formation (11)
-
Lake Gosiute (2)
-
Lookingglass Formation (1)
-
lower Eocene
-
Aquia Formation (1)
-
Hatchetigbee Formation (1)
-
Wasatchian (3)
-
Willwood Formation (9)
-
Wind River Formation (1)
-
Ypresian
-
London Clay (1)
-
-
-
middle Eocene
-
Aycross Formation (1)
-
Bartonian (1)
-
Claiborne Group (2)
-
Cook Mountain Formation (1)
-
Lisbon Formation (2)
-
Santee Limestone (1)
-
-
Nanjemoy Formation (1)
-
Subathu Formation (3)
-
Uintan (1)
-
upper Eocene
-
Chadronian (4)
-
Jackson Group (1)
-
Moodys Branch Formation (2)
-
Piney Point Formation (2)
-
Uinta Formation (1)
-
Yazoo Clay (1)
-
-
Wilkins Peak Member (1)
-
-
Flagstaff Formation (1)
-
Hanna Formation (10)
-
lower Paleogene (8)
-
Oligocene
-
Brule Formation (5)
-
Fontainebleau Sandstone (1)
-
Frio Formation (4)
-
lower Oligocene (7)
-
middle Oligocene
-
Bucatunna Formation (1)
-
Byram Formation (1)
-
-
upper Oligocene
-
Chattian (2)
-
-
Vicksburg Group (3)
-
-
Paleocene
-
Clayton Formation (1)
-
Lebo Member (1)
-
lower Paleocene
-
Danian (10)
-
K-T boundary (49)
-
Puercan (11)
-
Torrejonian (5)
-
-
Ludlow Member (4)
-
middle Paleocene (1)
-
Nacimiento Formation (2)
-
Nanafalia Formation (1)
-
Porters Creek Formation (1)
-
Ravenscrag Formation (9)
-
Tongue River Member (6)
-
Tullock Member (7)
-
upper Paleocene
-
Clarkforkian (2)
-
Thanetian (2)
-
Tiffanian (12)
-
-
-
Paleocene-Eocene Thermal Maximum (12)
-
Renova Formation (6)
-
Sespe Formation (1)
-
Wasatch Formation (7)
-
White River Group (15)
-
Wilcox Group (7)
-
Williamsburg Formation (1)
-
-
Shahejie Formation (4)
-
upper Tertiary (1)
-
-
Tulare Formation (1)
-
upper Cenozoic (4)
-
-
Dalradian (1)
-
Laurentide ice sheet (12)
-
Mesozoic
-
Bisbee Group (2)
-
Carrara Marble (1)
-
Cretaceous
-
Blairmore Group (2)
-
Colorado Group (6)
-
Comanchean
-
Buda Limestone (2)
-
Fredericksburg Group (1)
-
Glen Rose Formation (2)
-
Travis Peak Formation (1)
-
Washita Group (3)
-
-
Dakota Formation (43)
-
Graneros Shale (5)
-
Lower Cretaceous
-
Agrio Formation (4)
-
Albian
-
lower Albian (2)
-
upper Albian (8)
-
-
Aptian
-
Shuaiba Formation (2)
-
-
Barremian (7)
-
Bear River Formation (3)
-
Berriasian (2)
-
Blackleaf Formation (1)
-
Burro Canyon Formation (9)
-
Cedar Mountain Formation (15)
-
Clearwater Formation (4)
-
Cloverly Formation (6)
-
Fall River Formation (2)
-
Fredericksburg Group (1)
-
Gething Formation (1)
-
Glen Rose Formation (2)
-
Hauterivian (2)
-
Inyan Kara Group (1)
-
Kiowa Formation (1)
-
Lakota Formation (2)
-
Mannville Group (18)
-
McMurray Formation (11)
-
Mesa Rica Sandstone (2)
-
Mowry Shale (16)
-
Muddy Sandstone (9)
-
Newcastle Sandstone (3)
-
Skull Creek Shale (4)
-
Torok Formation (1)
-
Travis Peak Formation (1)
-
Valanginian (2)
-
Yingcheng Formation (1)
-
-
Mancos Shale (24)
-
Middle Cretaceous
-
Winton Formation (1)
-
-
Nanushuk Group (2)
-
Nenjiang Formation (2)
-
Potomac Group (2)
-
Qingshankou Formation (3)
-
Santana Formation (1)
-
Upper Cretaceous
-
Bearpaw Formation (12)
-
Belle Fourche Shale (2)
-
Belly River Formation (7)
-
Blackhawk Formation (5)
-
Bridge Creek Limestone Member (5)
-
Buda Limestone (2)
-
Campanian
-
Cerro del Pueblo Formation (1)
-
Dinosaur Park Formation (14)
-
lower Campanian (3)
-
upper Campanian (22)
-
-
Cardium Formation (5)
-
Carlile Shale (9)
-
Castlegate Sandstone (7)
-
Cenomanian
-
Dunvegan Formation (2)
-
lower Cenomanian (2)
-
upper Cenomanian (8)
-
-
Codell Sandstone Member (4)
-
Cody Shale (2)
-
Coniacian
-
lower Coniacian (1)
-
-
Demopolis Chalk (1)
-
Eagle Sandstone (5)
-
Edmonton Group (2)
-
Elkhorn Mountains Volcanics (1)
-
Eutaw Formation (2)
-
Ferron Sandstone Member (10)
-
Fort Hays Limestone Member (2)
-
Fox Hills Formation (17)
-
Frontier Formation (13)
-
Fruitland Formation (4)
-
Gallup Sandstone (4)
-
Gammon Ferruginous Member (2)
-
Greenhorn Limestone (14)
-
Gulfian
-
Aguja Formation (5)
-
Austin Group (1)
-
Eagle Ford Formation (7)
-
Olmos Formation (1)
-
Prairie Bluff Chalk (1)
-
Woodbine Formation (4)
-
-
Hell Creek Formation (37)
-
Hornbrook Formation (1)
-
Horseshoe Canyon Formation (17)
-
Javelina Formation (4)
-
Judith River Formation (14)
-
Kaiparowits Formation (4)
-
Kanguk Formation (1)
-
Kirtland Shale (1)
-
K-T boundary (49)
-
Lance Formation (13)
-
Laramie Formation (5)
-
Lewis Shale (8)
-
Maestrichtian
-
lower Maestrichtian (4)
-
upper Maestrichtian (13)
-
-
Maevarano Formation (1)
-
Mesaverde Group (16)
-
Middendorf Formation (1)
-
Milk River Formation (11)
-
Montana Group (3)
-
Mooreville Chalk (1)
-
Moreno Formation (2)
-
Niobrara Formation (27)
-
Ojo Alamo Sandstone (2)
-
Oldman Formation (8)
-
Pictured Cliffs Sandstone (1)
-
Pierre Shale (53)
-
Prince Creek Formation (2)
-
Ripley Formation (1)
-
Rock Springs Formation (1)
-
Saint Mary River Formation (3)
-
Santonian (13)
-
Selma Group (1)
-
Senonian (83)
-
Shannon Sandstone Member (3)
-
Sharon Springs Member (4)
-
Smoky Hill Chalk Member (1)
-
Star Point Sandstone (1)
-
Straight Cliffs Formation (9)
-
Sussex Sandstone Member (2)
-
Tropic Shale (5)
-
Tununk Member (1)
-
Turonian
-
lower Turonian (6)
-
middle Turonian (5)
-
-
Tuscaloosa Formation (4)
-
Two Medicine Formation (15)
-
Wahweap Formation (5)
-
Wall Creek Member (1)
-
Williams Fork Formation (5)
-
-
Viking Formation (8)
-
Whitemud Formation (5)
-
-
Glen Canyon Group (1)
-
Great Valley Sequence (1)
-
Jurassic
-
Aztec Sandstone (1)
-
Bazhenov Formation (1)
-
Carmel Formation (3)
-
Clarens Formation (1)
-
Fernie Formation (1)
-
Ferrar Group (1)
-
Kingak Shale (2)
-
Lower Jurassic
-
Nordegg Member (3)
-
Pliensbachian (3)
-
Toarcian (3)
-
Triassic-Jurassic boundary (1)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian (1)
-
Bathonian (3)
-
Callovian (3)
-
Page Sandstone (1)
-
Summerville Formation (3)
-
Todilto Formation (2)
-
-
Oxford Clay (2)
-
San Rafael Group (1)
-
Solnhofen Limestone (1)
-
Twin Creek Limestone (2)
-
Upper Jurassic
-
Brushy Basin Member (2)
-
Entrada Sandstone (8)
-
Fulmar Formation (1)
-
Hanifa Formation (1)
-
Haynesville Formation (1)
-
Kimmeridge Clay (2)
-
Kimmeridgian
-
upper Kimmeridgian (1)
-
-
Morrison Formation (33)
-
Oxfordian (8)
-
Portlandian (1)
-
Stump Formation (2)
-
Sundance Formation (13)
-
Swift Formation (3)
-
Tithonian (4)
-
-
-
lower Mesozoic (1)
-
Navajo Sandstone (10)
-
Nugget Sandstone (3)
-
Orocopia Schist (1)
-
Triassic
-
Hawkesbury Sandstone (1)
-
Lower Triassic
-
Dinwoody Formation (1)
-
Permian-Triassic boundary (5)
-
Smithian (1)
-
Spathian (1)
-
-
Middle Triassic
-
Anisian (2)
-
Doig Formation (6)
-
-
Moenkopi Formation (2)
-
Montney Formation (6)
-
Red Peak Formation (1)
-
Shublik Formation (1)
-
Upper Triassic
-
Carnian (1)
-
Chinle Formation (6)
-
Dockum Group (1)
-
Keuper (1)
-
Lockatong Formation (1)
-
Mercia Mudstone (1)
-
Norian (3)
-
Pardonet Formation (1)
-
Rhaetian
-
Penarth Group (1)
-
-
Shinarump Member (3)
-
Triassic-Jurassic boundary (1)
-
Xujiahe Formation (1)
-
Yanchang Formation (8)
-
-
-
upper Mesozoic (2)
-
Vaca Muerta Formation (6)
-
Yanshanian (1)
-
-
MIS 3 (1)
-
MIS 5 (1)
-
MIS 7 (1)
-
Moldanubian (2)
-
Paleozoic
-
Arbuckle Group (1)
-
Berea Sandstone (1)
-
Cambrian
-
Lower Cambrian (6)
-
Middle Cambrian (5)
-
Upper Cambrian
-
Furongian
-
Jiangshanian (1)
-
Paibian (1)
-
-
Lamotte Sandstone (1)
-
Mount Simon Sandstone (2)
-
Steptoean (4)
-
Wilberns Formation (1)
-
-
-
Carboniferous
-
Amsden Formation (3)
-
Benxi Formation (1)
-
Big Snowy Group (3)
-
Lower Carboniferous
-
Dinantian (5)
-
-
Mississippian
-
Barnett Shale (3)
-
Charles Formation (7)
-
Harrodsburg Limestone (1)
-
Lower Mississippian
-
Joana Limestone (1)
-
Kayak Shale (1)
-
Kinderhookian
-
Banff Formation (4)
-
-
Lodgepole Formation (17)
-
Osagian (3)
-
Tournaisian
-
upper Tournaisian (1)
-
-
-
Madison Group (22)
-
Middle Mississippian
-
Visean (3)
-
-
Mission Canyon Limestone (8)
-
Redwall Limestone (2)
-
Sunbury Shale (1)
-
Upper Mississippian
-
Chesterian
-
Cypress Sandstone (1)
-
-
Heath Formation (5)
-
Meramecian
-
Saint Louis Limestone (2)
-
Sainte Genevieve Limestone (1)
-
Salem Limestone (2)
-
-
Pennington Formation (1)
-
Serpukhovian (3)
-
-
-
Pennsylvanian
-
Conemaugh Group (1)
-
Joggins Formation (3)
-
Lower Pennsylvanian
-
Bashkirian (2)
-
Morrowan (1)
-
-
Middle Pennsylvanian
-
Atokan (2)
-
Desmoinesian
-
Cherokee Group (1)
-
Marmaton Group (1)
-
-
Moscovian (2)
-
Paradox Formation (3)
-
-
Minturn Formation (1)
-
Monongahela Group (1)
-
Morrow Formation (1)
-
Upper Pennsylvanian
-
Cisco Group (1)
-
Gzhelian (2)
-
Missourian
-
Kansas City Group (1)
-
Lansing Group (2)
-
Wann Formation (1)
-
-
Virgilian
-
Douglas Group (1)
-
Lawrence Formation (1)
-
Shawnee Group (1)
-
-
Wescogame Formation (1)
-
-
Watahomigi Formation (1)
-
-
Upper Carboniferous
-
Westphalian (1)
-
-
Wahoo Limestone (1)
-
-
Casper Formation (1)
-
Chattanooga Shale (1)
-
Cow Head Group (3)
-
Deadwood Formation (8)
-
Devonian
-
Beaverhill Lake Group (4)
-
Keg River Formation (5)
-
Lower Devonian
-
Coeymans Formation (1)
-
Emsian (1)
-
Lochkovian (1)
-
Manlius Formation (1)
-
Shap Granite (1)
-
-
Middle Devonian
-
Elk Point Group (7)
-
Givetian
-
Horn Plateau Formation (1)
-
-
Hamilton Group (2)
-
Marcellus Shale (6)
-
Moscow Formation (2)
-
Nahanni Formation (1)
-
Onondaga Limestone (1)
-
Prairie Evaporite (16)
-
Winnipegosis Formation (16)
-
-
Slave Point Formation (2)
-
Swan Hills Formation (2)
-
Upper Devonian
-
Birdbear Formation (1)
-
Duperow Formation (4)
-
Famennian
-
upper Famennian (2)
-
Wabamun Group (6)
-
-
Frasnian
-
Leduc Formation (5)
-
upper Frasnian (1)
-
-
Grosmont Formation (1)
-
Jefferson Group (2)
-
Nisku Formation (4)
-
Ohio Shale (3)
-
Olentangy Shale (1)
-
Palliser Formation (2)
-
-
Waterways Formation (1)
-
-
Dunkard Group (1)
-
Exshaw Formation (10)
-
Honaker Trail Formation (1)
-
Keyser Limestone (1)
-
Knox Group (1)
-
Lisburne Group (1)
-
lower Paleozoic
-
Cape Phillips Formation (1)
-
-
Maroon Formation (2)
-
middle Paleozoic (1)
-
Minnelusa Formation (6)
-
New Albany Shale (5)
-
Ordovician
-
Antelope Valley Limestone (1)
-
Eureka Quartzite (2)
-
Lower Ordovician
-
Arenigian (2)
-
Ellenburger Group (1)
-
Saint George Group (1)
-
Tremadocian (2)
-
-
Martinsburg Formation (1)
-
Middle Ordovician
-
Bromide Formation (1)
-
Chazyan (1)
-
Darriwilian (1)
-
Normanskill Formation (1)
-
Saint Peter Sandstone (1)
-
Whiterockian (3)
-
Winnipeg Formation (4)
-
-
Pogonip Group (1)
-
Upper Ordovician
-
Ashgillian (1)
-
Bighorn Dolomite (4)
-
Cincinnatian
-
Richmondian (1)
-
-
Hirnantian (1)
-
Katian (2)
-
Kope Formation (1)
-
Mohawkian (2)
-
Red River Formation (14)
-
Trentonian (2)
-
Whitewater Formation (1)
-
Wufeng Formation (3)
-
Yeoman Formation (5)
-
-
Viola Limestone (2)
-
-
Permian
-
Coconino Sandstone (1)
-
Cutler Formation (1)
-
Ecca Group (2)
-
Echooka Formation (1)
-
Guadalupian
-
Capitanian (2)
-
Roadian (2)
-
Wordian (1)
-
-
Kaibab Formation (2)
-
Khuff Formation (1)
-
Lower Permian
-
Abo Formation (1)
-
Cisuralian
-
Artinskian (1)
-
Asselian (1)
-
Kungurian (3)
-
Sakmarian (1)
-
-
Leonardian (1)
-
Opeche Shale (1)
-
Wolfcampian
-
Hueco Limestone (1)
-
-
-
Lyons Sandstone (5)
-
Maokou Formation (1)
-
Meade Peak Member (1)
-
Middle Permian (8)
-
Phosphoria Formation (5)
-
Rustler Formation (1)
-
Shihezi Formation (1)
-
Stone Corral Formation (1)
-
Toroweap Formation (2)
-
Unayzah Formation (1)
-
Upper Permian
-
Kazanian (1)
-
Permian-Triassic boundary (5)
-
Salado Formation (1)
-
-
Wellington Formation (1)
-
-
Pilot Shale (1)
-
Road River Formation (1)
-
Sauk Sequence (4)
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (1)
-
-
-
Middle Silurian (4)
-
Niagaran (2)
-
Upper Silurian
-
Bloomsburg Formation (1)
-
Ludlow
-
Ludfordian (1)
-
-
Pridoli (1)
-
Salina Group (1)
-
-
-
Supai Formation (3)
-
Taiyuan Formation (1)
-
Talchir Formation (1)
-
Tensleep Sandstone (4)
-
Tippecanoe Sequence (2)
-
upper Paleozoic
-
Admire Group (1)
-
Antrim Shale (2)
-
Bakken Formation (52)
-
Dwyka Formation (1)
-
Fountain Formation (3)
-
Kaskaskia Sequence (4)
-
Shanxi Formation (2)
-
Tirrawarra Sandstone (1)
-
-
Weber Sandstone (4)
-
Woodford Shale (4)
-
-
Phanerozoic (28)
-
Precambrian
-
Archean
-
Eoarchean (1)
-
Mesoarchean (3)
-
Neoarchean (13)
-
Paleoarchean (3)
-
Taihua Group (1)
-
-
Hadean (1)
-
Hazel Formation (1)
-
Kisseynew Complex (1)
-
Nonesuch Shale (2)
-
Spuhler Peak Formation (1)
-
Stillwater Complex (1)
-
upper Precambrian
-
Proterozoic
-
Damara System (1)
-
Huronian (2)
-
Isan Orogeny (1)
-
Keweenawan (1)
-
Lewisian (1)
-
Mesoproterozoic
-
Aldridge Formation (1)
-
Belt Supergroup (4)
-
Helikian (1)
-
Missoula Group (1)
-
Ravalli Group (1)
-
Shuangqiaoshan Group (1)
-
-
Miette Group (1)
-
Neoproterozoic
-
Ediacaran (4)
-
Riphean (1)
-
Tonian (1)
-
Torridonian (2)
-
Vendian (1)
-
-
Oronto Group (1)
-
Ortega Group (1)
-
Paleoproterozoic
-
Birimian (1)
-
Qinling Group (1)
-
-
Sinian
-
Xiong'er Group (1)
-
-
-
-
Vadito Group (2)
-
-
-
igneous rocks
-
igneous rocks
-
carbonatites (5)
-
kimberlite (3)
-
plutonic rocks
-
diabase (2)
-
diorites
-
tonalite (1)
-
trondhjemite (1)
-
-
gabbros
-
alkali gabbros (1)
-
-
granites
-
alkali granites (2)
-
aplite (5)
-
A-type granites (5)
-
biotite granite (1)
-
charnockite (1)
-
granite porphyry (2)
-
I-type granites (1)
-
leucogranite (13)
-
microgranite (1)
-
monzogranite (4)
-
muscovite granite (1)
-
rapakivi (2)
-
S-type granites (6)
-
two-mica granite (3)
-
-
granodiorites (8)
-
lamproite (1)
-
lamprophyres (1)
-
monzodiorite (1)
-
monzonites (3)
-
pegmatite (93)
-
syenites
-
albitite (2)
-
alkali syenites (1)
-
nepheline syenite (1)
-
quartz syenite (2)
-
-
ultramafics
-
peridotites
-
dunite (1)
-
harzburgite (2)
-
-
pyroxenite
-
orthopyroxenite (1)
-
-
-
-
porphyry
-
vitrophyre (1)
-
-
volcanic rocks
-
adakites (1)
-
andesites (5)
-
basalts
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alkali basalts (1)
-
flood basalts (5)
-
mid-ocean ridge basalts (6)
-
ocean-island basalts (1)
-
shoshonite (1)
-
-
dacites (1)
-
glasses
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obsidian (2)
-
volcanic glass (6)
-
-
latite (1)
-
phonolites (2)
-
pyroclastics
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ash-flow tuff (1)
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ignimbrite (7)
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pumice (2)
-
rhyolite tuff (1)
-
scoria (1)
-
tuff (10)
-
-
rhyodacites (1)
-
rhyolites (9)
-
trachytes (1)
-
vitrophyre (1)
-
-
-
ophiolite (1)
-
volcanic ash (9)
-
-
metamorphic rocks
-
K-bentonite (1)
-
metamorphic rocks
-
amphibolites (11)
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cataclasites (2)
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eclogite (6)
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garnetite (1)
-
gneisses
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granite gneiss (2)
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orthogneiss (5)
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paragneiss (1)
-
-
granulites (5)
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impactites (1)
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lapis lazuli (1)
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marbles (4)
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metaigneous rocks
-
metabasite (3)
-
metagabbro (2)
-
metagranite (4)
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metarhyolite (2)
-
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
meta-arkose (1)
-
metaconglomerate (3)
-
metapelite (7)
-
metasandstone (1)
-
paragneiss (1)
-
-
metasomatic rocks
-
skarn (6)
-
-
metavolcanic rocks (3)
-
migmatites
-
anatexite (3)
-
-
mylonites
-
pseudotachylite (1)
-
-
phyllites (1)
-
quartzites (14)
-
schists
-
greenschist (2)
-
greenstone (1)
-
-
slates (2)
-
-
ophiolite (1)
-
turbidite (9)
-
-
meteorites
-
meteorites
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stony meteorites
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achondrites
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Martian meteorites
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SNC Meteorites
-
chassignite
-
Chassigny Meteorite (1)
-
-
nakhlite (1)
-
shergottite (2)
-
-
-
-
chondrites (3)
-
-
-
-
minerals
-
alloys
-
awaruite (1)
-
electrum (1)
-
-
arsenates (1)
-
arsenides
-
arsenopyrite (4)
-
lollingite (2)
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maucherite (1)
-
-
arsenites (1)
-
borates (1)
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carbonates
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ankerite (1)
-
aragonite (5)
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bastnaesite (1)
-
calcite (43)
-
dolomite (17)
-
hydromagnesite (1)
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magnesian calcite (4)
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malachite (1)
-
rhodochrosite (1)
-
siderite (10)
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sphaerosiderite (6)
-
-
chromates (1)
-
halides
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bromides (1)
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chlorides
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carnallite (1)
-
halite (13)
-
-
fluorides
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bastnaesite (1)
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fluorite (6)
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topaz (2)
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triplite (2)
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zinnwaldite (1)
-
-
-
hydrates (1)
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K-bentonite (1)
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manganese minerals (1)
-
minerals (7)
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native elements
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graphite (2)
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onyx (1)
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organic minerals
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amber (2)
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-
oxides
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aluminum oxides (2)
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anatase (1)
-
baddeleyite (3)
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brucite (1)
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cassiterite (14)
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chromite (1)
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chrysoberyl (1)
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corundum (1)
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ferrihydrite (1)
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gahnite (2)
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goethite (4)
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hematite (6)
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hydroxides
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iron hydroxides (1)
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oxyhydroxides (2)
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-
ilmenite (3)
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iron oxides (7)
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leucoxene (1)
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limonite (1)
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maghemite (1)
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magnesium oxides (1)
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magnetite (4)
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manganese oxides (1)
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martite (1)
-
niobates
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aeschynite (1)
-
columbite (20)
-
euxenite (1)
-
ixiolite (2)
-
pyrochlore (2)
-
tapiolite (4)
-
-
pitchblende (1)
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rutile (5)
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sapphire (2)
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spinel (1)
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spinel group (1)
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tantalates
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euxenite (1)
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ixiolite (2)
-
microlite (3)
-
tantalite (13)
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wodginite (2)
-
-
titanomagnetite (1)
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uraninite (5)
-
-
phosphates
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amblygonite (2)
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apatite (30)
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barbosalite (1)
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britholite (1)
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chlorapatite (1)
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crandallite (1)
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fluorapatite (4)
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graftonite (1)
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hureaulite (1)
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lazulite (1)
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lithiophilite (2)
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monazite (30)
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montebrasite (3)
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rockbridgeite (1)
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sarcopside (1)
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strengite (1)
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triphylite (2)
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triplite (2)
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turquoise (2)
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variscite (1)
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vivianite (1)
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xenotime (8)
-
-
selenates (2)
-
selenides (1)
-
silicates
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aluminosilicates (1)
-
asbestos (9)
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borosilicates (2)
-
chain silicates
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amphibole group
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clinoamphibole
-
actinolite (1)
-
hornblende (9)
-
tremolite (1)
-
-
orthoamphibole
-
holmquistite (1)
-
-
-
jade (1)
-
pyroxene group
-
clinopyroxene
-
diopside (1)
-
jadeite (1)
-
omphacite (1)
-
spodumene (13)
-
-
-
-
feldspathoids (1)
-
framework silicates
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feldspar group
-
alkali feldspar
-
adularia (2)
-
amazonite (1)
-
K-feldspar (14)
-
microcline (1)
-
orthoclase (2)
-
perthite (2)
-
sanidine (11)
-
-
plagioclase
-
albite (4)
-
-
-
leucite (2)
-
myrmekite (1)
-
nepheline group
-
nepheline (1)
-
-
silica minerals
-
agate (3)
-
amethyst (1)
-
carnelian (2)
-
chalcedony (5)
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chrysoprase (1)
-
coesite (1)
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cristobalite (1)
-
jasper (1)
-
moganite (4)
-
opal
-
opal-A (1)
-
opal-CT (1)
-
-
quartz
-
smoky quartz (1)
-
-
-
zeolite group
-
analcime (1)
-
chabazite (2)
-
edingtonite (1)
-
erionite (7)
-
ferrierite (1)
-
garronite (1)
-
gmelinite (1)
-
heulandite (1)
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laumontite (1)
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mesolite (1)
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mordenite (1)
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natrolite (2)
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offretite (2)
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phillipsite (1)
-
pollucite (4)
-
roggianite (1)
-
scolecite (2)
-
thomsonite (1)
-
wairakite (1)
-
yugawaralite (1)
-
-
-
orthosilicates
-
nesosilicates
-
andalusite (2)
-
britholite group
-
britholite (1)
-
-
datolite group
-
gadolinite (1)
-
-
dumortierite (1)
-
garnet group
-
almandine (1)
-
schorlomite (1)
-
spessartine (2)
-
-
kyanite (2)
-
olivine group
-
forsterite (1)
-
olivine (1)
-
peridot (1)
-
-
sillimanite (1)
-
staurolite (2)
-
titanite group
-
titanite (8)
-
-
topaz (2)
-
zircon group
-
coffinite (2)
-
thorite (2)
-
zircon (142)
-
-
-
sorosilicates
-
epidote group
-
allanite (2)
-
epidote (4)
-
-
-
-
ring silicates
-
aquamarine (2)
-
beryl (13)
-
cordierite (2)
-
emerald (2)
-
tourmaline group
-
dravite (7)
-
elbaite (10)
-
foitite (2)
-
schorl (9)
-
-
-
sheet silicates
-
chlorite group
-
chlorite (9)
-
-
clay minerals
-
beidellite (1)
-
kaolinite (14)
-
montmorillonite (4)
-
smectite (17)
-
-
illite (21)
-
mica group
-
annite (1)
-
biotite (15)
-
celadonite (2)
-
glauconite (3)
-
lepidolite (9)
-
muscovite (21)
-
phengite (1)
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phlogopite (1)
-
polylithionite (2)
-
zinnwaldite (1)
-
-
palygorskite (1)
-
petalite (5)
-
sericite (3)
-
serpentine group
-
antigorite (1)
-
berthierine (1)
-
chrysotile (1)
-
serpentine (1)
-
-
-
-
sulfates
-
alunite (1)
-
anhydrite (21)
-
barite (2)
-
gypsum (14)
-
hexahydrite (1)
-
jarosite (1)
-
polyhalite (1)
-
selenite (1)
-
thenardite (1)
-
-
sulfides
-
arsenopyrite (4)
-
bismuthinite (1)
-
bornite (2)
-
chalcocite (1)
-
chalcopyrite (6)
-
copper sulfides (1)
-
galena (4)
-
heazlewoodite (1)
-
iron sulfides (1)
-
marcasite (1)
-
mawsonite (1)
-
molybdenite (5)
-
orpiment (1)
-
pentlandite (1)
-
pyrite (17)
-
pyrrhotite (5)
-
realgar (1)
-
roquesite (1)
-
sphalerite (2)
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stibnite (1)
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tetradymite (1)
-
-
sulfosalts
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sulfantimonites
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tetrahedrite (1)
-
-
sulfarsenites
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gratonite (1)
-
jordanite (1)
-
tennantite (2)
-
-
-
tellurides
-
tetradymite (1)
-
-
tungstates
-
scheelite (1)
-
wolframite (1)
-
-
uranium minerals (1)
-
-
Primary terms
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absolute age (245)
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academic institutions (1)
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Africa
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Central Africa
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Congo (1)
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East Africa
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North Africa
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Egypt
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Morocco
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Tafilalt (1)
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Tunisia (3)
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Southern Africa
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South Africa
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West Africa
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Senegal (1)
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Antarctica
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Asia
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Central Asia
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Far East
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Burma (1)
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Japan
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associations (5)
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Expedition 316
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Invertebrata
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Insecta
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Brachiopoda
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Echinodermata
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Ostreoidea
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Palaeoheterodonta
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Cephalopoda
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Porifera
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Textulariina
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Vermes
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Mesozoic
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Cretaceous
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Travis Peak Formation (1)
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Washita Group (3)
-
-
Dakota Formation (43)
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Graneros Shale (5)
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Lower Cretaceous
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Agrio Formation (4)
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Albian
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lower Albian (2)
-
upper Albian (8)
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Aptian
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Shuaiba Formation (2)
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Barremian (7)
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Blackleaf Formation (1)
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Burro Canyon Formation (9)
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Cedar Mountain Formation (15)
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Clearwater Formation (4)
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Cloverly Formation (6)
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Fall River Formation (2)
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Fredericksburg Group (1)
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Gething Formation (1)
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Glen Rose Formation (2)
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Hauterivian (2)
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Inyan Kara Group (1)
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Kiowa Formation (1)
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Lakota Formation (2)
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Mannville Group (18)
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McMurray Formation (11)
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Mesa Rica Sandstone (2)
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Mowry Shale (16)
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Muddy Sandstone (9)
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Newcastle Sandstone (3)
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Skull Creek Shale (4)
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Torok Formation (1)
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Travis Peak Formation (1)
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Valanginian (2)
-
Yingcheng Formation (1)
-
-
Mancos Shale (24)
-
Middle Cretaceous
-
Winton Formation (1)
-
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Nanushuk Group (2)
-
Nenjiang Formation (2)
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Potomac Group (2)
-
Qingshankou Formation (3)
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Santana Formation (1)
-
Upper Cretaceous
-
Bearpaw Formation (12)
-
Belle Fourche Shale (2)
-
Belly River Formation (7)
-
Blackhawk Formation (5)
-
Bridge Creek Limestone Member (5)
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Buda Limestone (2)
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Campanian
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Cerro del Pueblo Formation (1)
-
Dinosaur Park Formation (14)
-
lower Campanian (3)
-
upper Campanian (22)
-
-
Cardium Formation (5)
-
Carlile Shale (9)
-
Castlegate Sandstone (7)
-
Cenomanian
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Dunvegan Formation (2)
-
lower Cenomanian (2)
-
upper Cenomanian (8)
-
-
Codell Sandstone Member (4)
-
Cody Shale (2)
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Coniacian
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lower Coniacian (1)
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Demopolis Chalk (1)
-
Eagle Sandstone (5)
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Edmonton Group (2)
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Elkhorn Mountains Volcanics (1)
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Eutaw Formation (2)
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Ferron Sandstone Member (10)
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Fort Hays Limestone Member (2)
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Fox Hills Formation (17)
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Frontier Formation (13)
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Fruitland Formation (4)
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Gallup Sandstone (4)
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Gammon Ferruginous Member (2)
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Greenhorn Limestone (14)
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Gulfian
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Aguja Formation (5)
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Austin Group (1)
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Eagle Ford Formation (7)
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Olmos Formation (1)
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Prairie Bluff Chalk (1)
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Woodbine Formation (4)
-
-
Hell Creek Formation (37)
-
Hornbrook Formation (1)
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Horseshoe Canyon Formation (17)
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Javelina Formation (4)
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Judith River Formation (14)
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Kaiparowits Formation (4)
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Kanguk Formation (1)
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Kirtland Shale (1)
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K-T boundary (49)
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Lance Formation (13)
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Laramie Formation (5)
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Lewis Shale (8)
-
Maestrichtian
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lower Maestrichtian (4)
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upper Maestrichtian (13)
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Maevarano Formation (1)
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Mesaverde Group (16)
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Middendorf Formation (1)
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Milk River Formation (11)
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Montana Group (3)
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Mooreville Chalk (1)
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Moreno Formation (2)
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Niobrara Formation (27)
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Ojo Alamo Sandstone (2)
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Oldman Formation (8)
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Pictured Cliffs Sandstone (1)
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Pierre Shale (53)
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Prince Creek Formation (2)
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Ripley Formation (1)
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Rock Springs Formation (1)
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Saint Mary River Formation (3)
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Santonian (13)
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Selma Group (1)
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Senonian (83)
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Shannon Sandstone Member (3)
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Sharon Springs Member (4)
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Smoky Hill Chalk Member (1)
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Star Point Sandstone (1)
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Straight Cliffs Formation (9)
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Sussex Sandstone Member (2)
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Tropic Shale (5)
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Tununk Member (1)
-
Turonian
-
lower Turonian (6)
-
middle Turonian (5)
-
-
Tuscaloosa Formation (4)
-
Two Medicine Formation (15)
-
Wahweap Formation (5)
-
Wall Creek Member (1)
-
Williams Fork Formation (5)
-
-
Viking Formation (8)
-
Whitemud Formation (5)
-
-
Glen Canyon Group (1)
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Great Valley Sequence (1)
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Jurassic
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Aztec Sandstone (1)
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Bazhenov Formation (1)
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Carmel Formation (3)
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Clarens Formation (1)
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Fernie Formation (1)
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Ferrar Group (1)
-
Kingak Shale (2)
-
Lower Jurassic
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Nordegg Member (3)
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Pliensbachian (3)
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Toarcian (3)
-
Triassic-Jurassic boundary (1)
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upper Liassic (1)
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Middle Jurassic
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Page Sandstone (1)
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Summerville Formation (3)
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Todilto Formation (2)
-
-
Oxford Clay (2)
-
San Rafael Group (1)
-
Solnhofen Limestone (1)
-
Twin Creek Limestone (2)
-
Upper Jurassic
-
Brushy Basin Member (2)
-
Entrada Sandstone (8)
-
Fulmar Formation (1)
-
Hanifa Formation (1)
-
Haynesville Formation (1)
-
Kimmeridge Clay (2)
-
Kimmeridgian
-
upper Kimmeridgian (1)
-
-
Morrison Formation (33)
-
Oxfordian (8)
-
Portlandian (1)
-
Stump Formation (2)
-
Sundance Formation (13)
-
Swift Formation (3)
-
Tithonian (4)
-
-
-
lower Mesozoic (1)
-
Navajo Sandstone (10)
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Nugget Sandstone (3)
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Orocopia Schist (1)
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Triassic
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Hawkesbury Sandstone (1)
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Lower Triassic
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Dinwoody Formation (1)
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Permian-Triassic boundary (5)
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Smithian (1)
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-
-
Middle Triassic
-
Anisian (2)
-
Doig Formation (6)
-
-
Moenkopi Formation (2)
-
Montney Formation (6)
-
Red Peak Formation (1)
-
Shublik Formation (1)
-
Upper Triassic
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Carnian (1)
-
Chinle Formation (6)
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Dockum Group (1)
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Keuper (1)
-
Lockatong Formation (1)
-
Mercia Mudstone (1)
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Norian (3)
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Pardonet Formation (1)
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Rhaetian
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Penarth Group (1)
-
-
Shinarump Member (3)
-
Triassic-Jurassic boundary (1)
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Xujiahe Formation (1)
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Yanchang Formation (8)
-
-
-
upper Mesozoic (2)
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Vaca Muerta Formation (6)
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Yanshanian (1)
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metal ores
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-
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metals
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uranium
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U-238 (1)
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alkali metals
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cesium
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Li-7/Li-6 (5)
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potassium (6)
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rubidium
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Rb-87/Sr-86 (1)
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sodium (12)
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alkaline earth metals
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barium (3)
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beryllium
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Be-10 (7)
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calcium
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Ca-44/Ca-40 (1)
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Mg/Ca (2)
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Sr/Ca (1)
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magnesium
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Mg/Ca (2)
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Mg-25/Mg-24 (1)
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Mg-26/Mg-24 (1)
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radium
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Ra-228/Ra-226 (1)
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strontium
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Rb-87/Sr-86 (1)
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Sr/Ca (1)
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Sr-87/Sr-86 (48)
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-
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aluminum
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Al-26 (2)
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arsenic (3)
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chromium (3)
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cobalt (1)
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copper (1)
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gold (5)
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hafnium
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Hf-177/Hf-176 (4)
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indium (2)
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iron
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Fe-56/Fe-54 (4)
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Fe-57/Fe-54 (1)
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ferric iron (3)
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ferrous iron (3)
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lead
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Pb-206/Pb-204 (13)
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Pb-207/Pb-204 (10)
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Pb-207/Pb-206 (6)
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Pb-208/Pb-204 (8)
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Pb-208/Pb-206 (2)
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Pb-210 (2)
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manganese (6)
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nickel (1)
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niobium (16)
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platinum group
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osmium
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Os-188/Os-187 (6)
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Re-187/Os-188 (2)
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palladium (1)
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precious metals (2)
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Nd-144/Nd-143 (22)
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Sm-147/Nd-144 (4)
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samarium
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Sm-147/Nd-144 (4)
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scandium (2)
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yttrium (10)
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rhenium
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Re-187/Os-188 (2)
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tantalum (20)
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chondrites (3)
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meteorology (1)
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Mexico
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North America
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Rocky Mountains foreland (6)
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Western Interior
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ocean circulation (2)
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Ocean Drilling Program
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Leg 170
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ODP Site 1039 (1)
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ODP Site 1040 (1)
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Leg 171B
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ODP Site 1049 (1)
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ODP Site 1050 (2)
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ODP Site 1052 (2)
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Leg 174AX (2)
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Leg 194
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ODP Site 1193 (1)
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Leg 198
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ODP Site 1210 (1)
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Leg 208
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ODP Site 1262 (1)
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-
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ocean floors (7)
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Oceania
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oceanography (1)
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South Pacific
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West Pacific
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Yellow Sea
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Bohai Bay (3)
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-
-
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Southwest Pacific
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Coral Sea
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paleobotany (7)
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paleoclimatology (191)
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paleogeography (256)
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Paleozoic
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Lamotte Sandstone (1)
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Mount Simon Sandstone (2)
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Steptoean (4)
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Wilberns Formation (1)
-
-
-
Carboniferous
-
Amsden Formation (3)
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Benxi Formation (1)
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Big Snowy Group (3)
-
Lower Carboniferous
-
Dinantian (5)
-
-
Mississippian
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Barnett Shale (3)
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Charles Formation (7)
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Harrodsburg Limestone (1)
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Lower Mississippian
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Joana Limestone (1)
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Kayak Shale (1)
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Kinderhookian
-
Banff Formation (4)
-
-
Lodgepole Formation (17)
-
Osagian (3)
-
Tournaisian
-
upper Tournaisian (1)
-
-
-
Madison Group (22)
-
Middle Mississippian
-
Visean (3)
-
-
Mission Canyon Limestone (8)
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Redwall Limestone (2)
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Sunbury Shale (1)
-
Upper Mississippian
-
Chesterian
-
Cypress Sandstone (1)
-
-
Heath Formation (5)
-
Meramecian
-
Saint Louis Limestone (2)
-
Sainte Genevieve Limestone (1)
-
Salem Limestone (2)
-
-
Pennington Formation (1)
-
Serpukhovian (3)
-
-
-
Pennsylvanian
-
Conemaugh Group (1)
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Joggins Formation (3)
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Lower Pennsylvanian
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Bashkirian (2)
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Morrowan (1)
-
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Middle Pennsylvanian
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Atokan (2)
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Desmoinesian
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Cherokee Group (1)
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-
-
Moscovian (2)
-
Paradox Formation (3)
-
-
Minturn Formation (1)
-
Monongahela Group (1)
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Morrow Formation (1)
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Upper Pennsylvanian
-
Cisco Group (1)
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Gzhelian (2)
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Missourian
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Kansas City Group (1)
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Lansing Group (2)
-
Wann Formation (1)
-
-
Virgilian
-
Douglas Group (1)
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Lawrence Formation (1)
-
Shawnee Group (1)
-
-
Wescogame Formation (1)
-
-
Watahomigi Formation (1)
-
-
Upper Carboniferous
-
Westphalian (1)
-
-
Wahoo Limestone (1)
-
-
Casper Formation (1)
-
Chattanooga Shale (1)
-
Cow Head Group (3)
-
Deadwood Formation (8)
-
Devonian
-
Beaverhill Lake Group (4)
-
Keg River Formation (5)
-
Lower Devonian
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Coeymans Formation (1)
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Emsian (1)
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Lochkovian (1)
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Manlius Formation (1)
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Shap Granite (1)
-
-
Middle Devonian
-
Elk Point Group (7)
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Givetian
-
Horn Plateau Formation (1)
-
-
Hamilton Group (2)
-
Marcellus Shale (6)
-
Moscow Formation (2)
-
Nahanni Formation (1)
-
Onondaga Limestone (1)
-
Prairie Evaporite (16)
-
Winnipegosis Formation (16)
-
-
Slave Point Formation (2)
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Swan Hills Formation (2)
-
Upper Devonian
-
Birdbear Formation (1)
-
Duperow Formation (4)
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Famennian
-
upper Famennian (2)
-
Wabamun Group (6)
-
-
Frasnian
-
Leduc Formation (5)
-
upper Frasnian (1)
-
-
Grosmont Formation (1)
-
Jefferson Group (2)
-
Nisku Formation (4)
-
Ohio Shale (3)
-
Olentangy Shale (1)
-
Palliser Formation (2)
-
-
Waterways Formation (1)
-
-
Dunkard Group (1)
-
Exshaw Formation (10)
-
Honaker Trail Formation (1)
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Keyser Limestone (1)
-
Knox Group (1)
-
Lisburne Group (1)
-
lower Paleozoic
-
Cape Phillips Formation (1)
-
-
Maroon Formation (2)
-
middle Paleozoic (1)
-
Minnelusa Formation (6)
-
New Albany Shale (5)
-
Ordovician
-
Antelope Valley Limestone (1)
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Eureka Quartzite (2)
-
Lower Ordovician
-
Arenigian (2)
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Ellenburger Group (1)
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Saint George Group (1)
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Tremadocian (2)
-
-
Martinsburg Formation (1)
-
Middle Ordovician
-
Bromide Formation (1)
-
Chazyan (1)
-
Darriwilian (1)
-
Normanskill Formation (1)
-
Saint Peter Sandstone (1)
-
Whiterockian (3)
-
Winnipeg Formation (4)
-
-
Pogonip Group (1)
-
Upper Ordovician
-
Ashgillian (1)
-
Bighorn Dolomite (4)
-
Cincinnatian
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Richmondian (1)
-
-
Hirnantian (1)
-
Katian (2)
-
Kope Formation (1)
-
Mohawkian (2)
-
Red River Formation (14)
-
Trentonian (2)
-
Whitewater Formation (1)
-
Wufeng Formation (3)
-
Yeoman Formation (5)
-
-
Viola Limestone (2)
-
-
Permian
-
Coconino Sandstone (1)
-
Cutler Formation (1)
-
Ecca Group (2)
-
Echooka Formation (1)
-
Guadalupian
-
Capitanian (2)
-
Roadian (2)
-
Wordian (1)
-
-
Kaibab Formation (2)
-
Khuff Formation (1)
-
Lower Permian
-
Abo Formation (1)
-
Cisuralian
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Artinskian (1)
-
Asselian (1)
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Kungurian (3)
-
Sakmarian (1)
-
-
Leonardian (1)
-
Opeche Shale (1)
-
Wolfcampian
-
Hueco Limestone (1)
-
-
-
Lyons Sandstone (5)
-
Maokou Formation (1)
-
Meade Peak Member (1)
-
Middle Permian (8)
-
Phosphoria Formation (5)
-
Rustler Formation (1)
-
Shihezi Formation (1)
-
Stone Corral Formation (1)
-
Toroweap Formation (2)
-
Unayzah Formation (1)
-
Upper Permian
-
Kazanian (1)
-
Permian-Triassic boundary (5)
-
Salado Formation (1)
-
-
Wellington Formation (1)
-
-
Pilot Shale (1)
-
Road River Formation (1)
-
Sauk Sequence (4)
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (1)
-
-
-
Middle Silurian (4)
-
Niagaran (2)
-
Upper Silurian
-
Bloomsburg Formation (1)
-
Ludlow
-
Ludfordian (1)
-
-
Pridoli (1)
-
Salina Group (1)
-
-
-
Supai Formation (3)
-
Taiyuan Formation (1)
-
Talchir Formation (1)
-
Tensleep Sandstone (4)
-
Tippecanoe Sequence (2)
-
upper Paleozoic
-
Admire Group (1)
-
Antrim Shale (2)
-
Bakken Formation (52)
-
Dwyka Formation (1)
-
Fountain Formation (3)
-
Kaskaskia Sequence (4)
-
Shanxi Formation (2)
-
Tirrawarra Sandstone (1)
-
-
Weber Sandstone (4)
-
Woodford Shale (4)
-
-
palynology (3)
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palynomorphs
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acritarchs (6)
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Dinoflagellata
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-
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megaspores (9)
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Classopollis (2)
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pollen (51)
-
-
-
paragenesis (38)
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permafrost (3)
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petroleum
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natural gas
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coalbed methane (10)
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shale gas (18)
-
-
shale oil (16)
-
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petrology (41)
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Phanerozoic (28)
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phase equilibria (12)
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Plantae
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algae
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Coccolithophoraceae
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diatoms (8)
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nannofossils (5)
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Filicopsida
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Spermatophyta
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Gymnospermae
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Coniferales
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Ginkgo (3)
-
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Glossopteridales
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-
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Pteridospermae (4)
-
-
-
-
plate tectonics (103)
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pollution (27)
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potash (5)
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Precambrian
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Archean
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Eoarchean (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
western North Dakota
Three-dimensional seismic interpretation of a meteorite impact feature, Red Wing Creek field, Williston Basin, western North Dakota Available to Purchase
Taphonomy and suggested structure of the dinosaurian assemblage of the Hell Creek Formation (Maastrichtian), eastern Montana and western North Dakota Available to Purchase
Rocks, resolution, and the record; A review of depositional constraints on fossil vertebrate assemblages at the terrestrial Cretaceous/Paleogene boundary, eastern Montana and western North Dakota Available to Purchase
The spatial and temporal distributions of vertebrate fossil assemblages at the terrestrial Cretaceous/Paleogene (K/P) boundary in eastern Montana and western North Dakota are constrained by the meandering fluvial depositional system in which they are preserved. Vertebrate fossils are clasts within that system, and thus their positions within the sedimentary sequence are subject as much to hydrodynamics as to chronostratigraphy or evolution. Laterally discontinuous facies, incomplete stratigraphic sequences, facies-dependent fossil distributions, and reworking distort original patterns of faunal number and diversity through time. The sedimentary effects on vertebrate fossil distributions, however, can be assessed by the adoption of a facies-based biostratigraphy and the utilization of a chronostratigraphy that is concordant with the resolution afforded by the K/P rocks of eastern Montana and western North Dakota.
Paleosols spanning the Cretaceous-Paleogene transition, eastern Montana and western North Dakota Available to Purchase
Paleoenvironments of vertebrate-bearing strata during the Cretaceous-Paleogene transition, eastern Montana and western North Dakota Available to Purchase
Relation of Lithofacies and Diagenesis to Porosity Development, Mississippian Mission Canyon Formation, Eastern Montana and Western North Dakota Available to Purchase
Ordovician Red River Formation, Eastern Montana and Western North Dakota: Relationships Between Lithofacies and Production: ABSTRACT Free
Relation of Lithofacies and Diagenesis to Porosity Development, Mission Canyon Formation (Mississippian), Eastern Montana and Western North Dakota: ABSTRACT Free
Depositional Setting and Groundwater Quality in Coal-Bearing Sediments and Spoils in Western North Dakota 1 Available to Purchase
Abstract Studies of several active and proposed surface coal-mining sites in western North Dakota have resulted in the development of a hydrogeochemical framework which accounts for the chemical characteristics of groundwater in coal- bearing strata. Data from surface mining sites in other western states and provinces indicate much regional similarity in the hydrogeochemical characteristics of shallow aquifers. SO 4 = and HCO 3 - are commonly dominant anions. Na + and Ca ‡ are generally the dominant cations. Mg ‡ is occasionally dominant. The pH of the groundwater normally ranges from 7 to 9. The electrical conductance of the groundwater ranges from 500 to 4500 /μS. Groundwater at depth is generally of the Na—H0O 3 type. Critical hydrogeochemical processes include pyrite oxidation, carbonate mineral dissolution, gypsum precipitation and dissolution, cation exchange, and sulfate reduction. The key components of this framework are mineralogical variables in the sediments. These variables are, in turn, largely dependent upon fluctuations in the fluvial depositional settings of the sediments. During surface mining operations unweathered materials are commonly emplaced in the zone of active weathering. Hydrochemical data from postmining landscapes suggest that severe degradation of groundwater quality is possible in some settings. The degree of weathering, dissolution, and ion exchange, as in premining settings, is largely dependent upon mineralogical variables in the overburden sediments. Degradation of groundwater quality in postmining landscapes can be minimized if these factors are understood and integrated within the framework of mine design.
Stratigraphy and Paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota Available to Purchase
The Golden Valley Formation consists of claystone, mudstone, siltstone, micaceous sandstone, and lignite deposited under predominantly fluvial conditions during late Paleocene and early Eocene time in the Williston basin of North Dakota. The maximum thickness of the formation in the scattered erosional remnants in which it still persists is 55 m (180 ft). Lithologically the formation is divisible into two members: a lower unit, from 1.5 to 20 m (5 to 65 ft) thick, of light gray or brightly colored kaolinitic strata herein designated the Bear Den Member and an upper unit, as much as 45 m (150 ft) thick, of yellow to tan illitic to montmorillonitic strata herein designated the Camels Butte Member. The bright coloration and high kaolin content of the Bear Den Member, the uniform presence of mica in the sandstone of the Golden Valley Formation, the typical scarcity of lignite throughout the formation, and the presence of the unique floating fern Salvinia in the Camels Butte Member make the Golden Valley Formation distinguishable from adjacent rock-stratigraphic units. At its basal contact the unit is conformable on the Fort Union Formation except where channeling has occurred. All evidence indicates continuous deposition across the lower boundary of the formation with a change in clay-mineral input during deposition of the Bear Den Member. In weathered outcrops this member typically develops a tripartite color zonation made up of a basal gray zone, a middle orange zone, and a somber-colored carbonaceous zone at the top. The orange zone is a conspicuous marker of the formation over most of its outcrop area. The Bear Den Member becomes increasingly fine grained and carbonaceous upward. A thin bed of lignite (the Alamo Bluff lignite) or its lateral equivalent, silicified siltstone or freshwater limestone (the Taylor bed), marks its upper boundary. The orange weathering color of the midportion of the member is virtually eliminated beneath the Taylor bed. The Camels Butte Member, consisting of cross-bedded, predominantly sandy channel deposits and parallel-bedded, finer grained overbank deposits, lacks marker horizons of general extent. The proportion of channel-facies deposits increases steadily upward. Beneath the overlying, angularly unconformable White River Group, a zone of weathering and leaching extends downward as much as 23 m (75 ft) into the Camels Butte Member. No evidence of a marginal facies could be found at the present geographic limits of the Golden Valley Formation. Leaf architectural analysis, developed largely as a result of these investigations, played an essential role in the identification of the megafossil plants described in this report. The Bear Den Member yielded a megaflora of 41 species, closely resembling the late Paleocene part of the Fort Union flora. The most widespread vegetational community represented in the unit is inferred to have been a lowland forest whose numerically most important forms were Metasequoia , Corylus , Meliosma , “ Cocculus ,” Cercidiphyllum , and Chaetoptelea . Swamp and aquatic vegetation becomes increasingly abundant and more widely distributed upward in the Bear Den Member at the expense of lowland forest representatives. Eocene plant species—including Salvinia preauriculata , Lygodium kaulfussi , Platycarya americana , and Hemitelia magna —first appear at the level of the Alamo Bluff lignite and gradually replace Paleocene forms upward through the formation. The Camels Butte Member contains 37 species, the most numerous of which are Lamanonia , Meliosma , Salvinia , and Ternstroemites . As a unit the Camels Butte florule shows little relation to any previously described fossil flora. Fossil plant evidence, corroborated by that of associated vertebrates and invertebrates, indicates a warm temperate climate with an estimated mean annual temperature of 15°C (59°F) in late Paleocene time. The climate changed to subtropical with a mean annual temperature of 18.5°C (65°F) in early Eocene time. A major increase in the average temperature of the coldest month may have contributed significantly to floral change across the Paleocene-Eocene boundary. Stratigraphic position and fossils of the Bear Den Member indicate a late Paleocene age, and the Camels Butte Member is assigned an early Wasatchian age. These findings represent a revision of the previous assignment of an early Eocene age to the entire formation. Transport from an intensively weathered igneous and metamorphic terrane lying at a moderate distance from the basin of sedimentation is inferred from the composition and texture of the Golden Valley sedimentary deposits. Although previous workers accepted the occurrence of the “widespread, uniform kaolin blanket” of the Bear Den Member as evidence of a lacustrine origin, the predominance of channel-facies sandstone lenses interbedded with typical overbank and backswamp deposits throughout both members indicates a fluvial origin. Tectonic forces affecting the source and depositional areas, rather than local conditions, are inferred to have caused the interval of fine-grained, swampy sedimentation at the Bear Den-Camels Butte boundary as well as the abrupt changes in clay-mineral composition above and below the Bear Den Member and the increase in channel-facies sediment toward the top of the formation.