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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa (1)
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Chad Basin (1)
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East Africa
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Mozambique (1)
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tritium (2)
-
-
isotope ratios (64)
-
isotopes
-
radioactive isotopes
-
Al-26 (2)
-
Ar-40/Ar-39 (4)
-
Be-10 (8)
-
C-14 (30)
-
Cl-36 (2)
-
Cs-137 (2)
-
Pb-206/Pb-204 (8)
-
Pb-207/Pb-204 (7)
-
Pb-208/Pb-204 (5)
-
Pb-210 (2)
-
Ra-226 (1)
-
Rb-87/Sr-86 (2)
-
Re-187/Os-188 (1)
-
tritium (2)
-
U-238 (1)
-
U-238/U-234 (1)
-
-
stable isotopes
-
Ar-40 (1)
-
Ar-40/Ar-39 (4)
-
C-13 (1)
-
C-13/C-12 (23)
-
Ca-44/Ca-40 (1)
-
D/H (3)
-
Hf-177/Hf-176 (3)
-
N-15/N-14 (2)
-
Nd-144/Nd-143 (9)
-
O-17/O-16 (1)
-
O-18/O-16 (29)
-
Os-188/Os-187 (2)
-
Pb-206/Pb-204 (8)
-
Pb-207/Pb-204 (7)
-
Pb-207/Pb-206 (2)
-
Pb-208/Pb-204 (5)
-
Pb-208/Pb-206 (2)
-
Rb-87/Sr-86 (2)
-
Re-187/Os-188 (1)
-
S-34/S-32 (3)
-
Sr-87/Sr-86 (18)
-
-
-
Lu/Hf (1)
-
metals
-
actinides
-
thorium (2)
-
uranium
-
U-238 (1)
-
U-238/U-234 (1)
-
-
-
alkali metals
-
cesium
-
Cs-137 (2)
-
-
rubidium
-
Rb-87/Sr-86 (2)
-
-
sodium (3)
-
-
alkaline earth metals
-
barium (2)
-
beryllium
-
Be-10 (8)
-
-
calcium
-
Ca-44/Ca-40 (1)
-
Sr/Ca (1)
-
-
magnesium (3)
-
radium
-
Ra-226 (1)
-
-
strontium
-
Rb-87/Sr-86 (2)
-
Sr/Ca (1)
-
Sr-87/Sr-86 (18)
-
-
-
aluminum
-
Al-26 (2)
-
-
antimony (2)
-
arsenic (4)
-
bismuth (1)
-
cadmium (2)
-
chromium (1)
-
cobalt (1)
-
copper (5)
-
gold (2)
-
hafnium
-
Hf-177/Hf-176 (3)
-
-
iron
-
ferric iron (1)
-
-
lead
-
Pb-206/Pb-204 (8)
-
Pb-207/Pb-204 (7)
-
Pb-207/Pb-206 (2)
-
Pb-208/Pb-204 (5)
-
Pb-208/Pb-206 (2)
-
Pb-210 (2)
-
-
manganese (4)
-
mercury (5)
-
molybdenum (1)
-
platinum group
-
iridium (1)
-
osmium
-
Os-188/Os-187 (2)
-
Re-187/Os-188 (1)
-
-
palladium ores (1)
-
platinum ores (1)
-
-
rare earths
-
lanthanum (1)
-
neodymium
-
Nd-144/Nd-143 (9)
-
-
yttrium (3)
-
-
rhenium
-
Re-187/Os-188 (1)
-
-
tin (1)
-
vanadium (1)
-
zinc (5)
-
-
nitrogen
-
N-15/N-14 (2)
-
-
noble gases
-
argon
-
Ar-40 (1)
-
Ar-40/Ar-39 (4)
-
-
helium (3)
-
krypton (1)
-
neon (2)
-
radon (2)
-
xenon (1)
-
-
oxygen
-
O-17/O-16 (1)
-
O-18/O-16 (29)
-
-
phosphorus
-
organic phosphorus (1)
-
-
sulfur
-
S-34/S-32 (3)
-
-
tellurium (1)
-
trace metals (2)
-
-
fossils
-
bacteria (3)
-
borings (3)
-
burrows (6)
-
Chordata
-
Vertebrata
-
Agnatha
-
Heterostraci (2)
-
Osteostraci (1)
-
-
Pisces
-
Acanthodii (3)
-
Chondrichthyes
-
Elasmobranchii (6)
-
Euselachii (3)
-
Holocephali (1)
-
-
Osteichthyes
-
Actinopterygii
-
Teleostei
-
Cypriniformes (1)
-
Salmoniformes (1)
-
-
-
Sarcopterygii
-
Dipnoi (3)
-
-
-
Placodermi (1)
-
-
Tetrapoda
-
Amphibia
-
Labyrinthodontia
-
Temnospondyli (2)
-
-
Lissamphibia
-
Anura (2)
-
-
-
Aves
-
Neornithes
-
Neognathae
-
Strigiformes (1)
-
-
-
-
Mammalia
-
Multituberculata (3)
-
Theria
-
Eutheria
-
Amblypoda
-
Pantodonta (3)
-
-
Artiodactyla
-
Ruminantia
-
Tylopoda
-
Camelidae (1)
-
-
-
-
Carnivora
-
Fissipeda
-
Canidae (2)
-
Ursidae
-
Ursus (1)
-
-
-
-
Cetacea
-
Archaeoceti (1)
-
-
Chiroptera (2)
-
Condylarthra (2)
-
Creodonta (1)
-
Lagomorpha (1)
-
Perissodactyla
-
Ceratomorpha
-
Rhinocerotidae
-
Rhinoceros (1)
-
-
-
Hippomorpha
-
Equidae (2)
-
-
-
Primates
-
Hominidae
-
Homo
-
Homo sapiens
-
Homo sapiens sapiens (1)
-
-
-
-
-
Proboscidea
-
Elephantoidea
-
Elephantidae
-
Elephas
-
Elephas antiquus (1)
-
-
Mammuthus
-
Mammuthus columbi (1)
-
-
-
-
Mastodontoidea
-
Mammutidae (1)
-
-
-
Rodentia (4)
-
Tillodontia (1)
-
Ungulata (1)
-
-
Metatheria
-
Marsupialia
-
Polyprotodontia
-
Didelphidae (1)
-
-
-
-
-
-
Reptilia
-
Anapsida
-
Testudines
-
Chelonia (2)
-
Cryptodira (3)
-
-
-
Diapsida
-
Archosauria
-
Crocodilia
-
Eusuchia
-
Crocodylidae (2)
-
-
-
dinosaurs
-
Ornithischia
-
Ankylosauria (2)
-
Ceratopsia
-
Ceratopsidae (2)
-
-
Ornithopoda
-
Hadrosauridae (4)
-
-
-
Saurischia
-
Sauropodomorpha
-
Sauropoda
-
Titanosauridae (1)
-
-
-
Theropoda
-
Carnosauria (1)
-
Coelurosauria
-
Dromaeosauridae (2)
-
Tyrannosauridae
-
Tyrannosaurus (2)
-
-
-
-
-
-
Pterosauria (3)
-
Thecodontia
-
Aetosauria (1)
-
-
-
Ichthyosauria (1)
-
Lepidosauria
-
Squamata
-
Lacertilia
-
Mosasauridae (7)
-
-
Serpentes (1)
-
-
-
Sauropterygia
-
Plesiosauria (1)
-
-
-
Synapsida
-
Therapsida
-
Dicynodontia
-
Lystrosaurus (1)
-
-
-
-
-
-
Thelodonti (1)
-
-
-
coprolites (5)
-
cyanobacteria (1)
-
eukaryotes (1)
-
fossil man (2)
-
fungi (2)
-
Graptolithina (4)
-
Hemichordata (1)
-
ichnofossils
-
Rhizocorallium (1)
-
Skolithos (1)
-
Trypanites (1)
-
-
Invertebrata
-
Arthropoda
-
Chelicerata
-
Merostomata
-
Eurypterida (2)
-
-
-
Mandibulata
-
Crustacea
-
Branchiopoda (3)
-
Copepoda (1)
-
Ostracoda
-
Podocopida
-
Bairdiomorpha
-
Bairdiacea
-
Bairdiidae
-
Bairdia (1)
-
-
-
-
Cytherocopina
-
Cytheracea
-
Cyprideis (1)
-
-
-
-
-
-
Insecta (6)
-
Myriapoda (1)
-
-
Trilobitomorpha
-
Trilobita (3)
-
-
-
Brachiopoda
-
Articulata
-
Spiriferida
-
Cyrtospirifer (1)
-
-
-
-
Cnidaria
-
Anthozoa
-
Zoantharia
-
Tabulata (1)
-
-
-
-
Echinodermata
-
Asterozoa
-
Stelleroidea
-
Asteroidea (1)
-
-
-
Echinozoa
-
Holothuroidea (1)
-
-
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Veneroida
-
Veneridae
-
Mercenaria (1)
-
-
-
-
Ostreoidea
-
Ostreidae (1)
-
-
Palaeoheterodonta
-
Unionidae (2)
-
-
Pterioida
-
Pteriina
-
Inocerami
-
Inoceramidae
-
Inoceramus (1)
-
-
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (3)
-
-
Nautiloidea (1)
-
-
Gastropoda
-
Neogastropoda (2)
-
Pulmonata (1)
-
Turritellidae (1)
-
-
Scaphopoda (1)
-
-
Porifera
-
Stromatoporoidea (2)
-
-
Protista
-
Foraminifera
-
Allogromiina (1)
-
Fusulinina
-
Fusulinidae (2)
-
-
Rotaliina
-
Buliminacea
-
Bolivinitidae
-
Bolivina (1)
-
-
Uvigerinidae
-
Uvigerina (1)
-
-
-
Globigerinacea
-
Globigerinidae
-
Globigerina (1)
-
-
-
Nodosariacea
-
Nodosariidae
-
Lenticulina (1)
-
-
-
Rotaliacea
-
Ammonia (1)
-
-
-
Textulariina
-
Lituolacea
-
Trochammina (1)
-
-
-
-
Radiolaria (5)
-
-
Vermes
-
Annelida (2)
-
Polychaeta (2)
-
scolecodonts (2)
-
-
-
Metazoa (1)
-
microfossils
-
Charophyta (2)
-
Chitinozoa (1)
-
Conodonta
-
Adetognathus (1)
-
Neogondolella (1)
-
-
Fusulinina
-
Fusulinidae (2)
-
-
scolecodonts (2)
-
-
palynomorphs
-
acritarchs (3)
-
Chitinozoa (1)
-
Dinoflagellata (4)
-
miospores
-
pollen (17)
-
-
-
Plantae
-
algae
-
Chlorophyta
-
Charophyta (2)
-
-
Coccolithophoraceae (1)
-
diatoms (5)
-
Microcodium (1)
-
nannofossils
-
Sphenolithus (1)
-
-
-
Pteridophyta
-
Filicopsida
-
Taeniopteris (1)
-
-
Lycopsida (1)
-
-
Spermatophyta
-
Angiospermae
-
Dicotyledoneae
-
Fagus (1)
-
-
-
Gymnospermae
-
Coniferales
-
Taxodiaceae
-
Metasequoia (1)
-
-
-
-
-
-
problematic fossils (2)
-
prokaryotes (1)
-
Pterobranchia (1)
-
thallophytes (2)
-
tracks (13)
-
trails (1)
-
-
geochronology methods
-
(U-Th)/He (15)
-
Ar/Ar (79)
-
exposure age (7)
-
fission-track dating (13)
-
infrared stimulated luminescence (1)
-
K/Ar (2)
-
Lu/Hf (1)
-
Nd/Nd (1)
-
optically stimulated luminescence (5)
-
paleomagnetism (20)
-
Pb/Pb (3)
-
racemization (1)
-
radiation damage (1)
-
Rb/Sr (5)
-
Re/Os (2)
-
sclerochronology (1)
-
Sm/Nd (1)
-
Sr/Sr (1)
-
tephrochronology (5)
-
Th/U (5)
-
thermochronology (18)
-
thermoluminescence (1)
-
tree rings (4)
-
U/Pb (73)
-
U/Th/Pb (1)
-
uranium disequilibrium (2)
-
-
geologic age
-
Anthropocene (3)
-
Cenozoic
-
Blancan (1)
-
Bronze Age (2)
-
Glenns Ferry Formation (2)
-
Iron Age (1)
-
lower Cenozoic (1)
-
middle Cenozoic (2)
-
Quaternary
-
Clovis (1)
-
Holocene
-
lower Holocene (5)
-
Medieval Warm Period (1)
-
Middle Ages (2)
-
Neoglacial
-
Little Ice Age (1)
-
-
Neolithic (1)
-
upper Holocene
-
Little Ice Age (1)
-
Roman period (1)
-
-
-
Mazama Ash (2)
-
Pleistocene
-
Bandelier Tuff (1)
-
Bishop Tuff (3)
-
Champlain Sea (1)
-
Illinoian (2)
-
Irvingtonian (2)
-
Lake Agassiz (4)
-
Lake Lahontan (1)
-
Lake Missoula (3)
-
lower Pleistocene (4)
-
middle Pleistocene (1)
-
upper Pleistocene
-
Lake Iroquois (1)
-
Weichselian
-
upper Weichselian
-
Allerod (1)
-
Bolling (1)
-
Younger Dryas (2)
-
-
-
Wisconsinan
-
upper Wisconsinan (4)
-
-
-
-
upper Quaternary
-
Bull Lake Glaciation (1)
-
-
-
Saugus Formation (1)
-
Stone Age
-
Neolithic (1)
-
-
Tertiary
-
Catahoula Formation (1)
-
Challis Volcanics (3)
-
Florissant Lake Beds (1)
-
Lincoln Creek Formation (1)
-
lower Tertiary (4)
-
Muddy Creek Formation (1)
-
Neogene
-
Furnace Creek Formation (1)
-
Hemphillian (1)
-
Miocene
-
Ash Hollow Formation (1)
-
Barstow Formation (1)
-
Calvert Formation (1)
-
Clarendonian (1)
-
Columbia River Basalt Group (7)
-
Grande Ronde Basalt (1)
-
lower Miocene (4)
-
middle Miocene
-
Choptank Formation (1)
-
Langhian (1)
-
-
Saddle Mountains Basalt (2)
-
Saint Marys Formation (1)
-
Topopah Spring Member (1)
-
upper Miocene
-
Eastover Formation (1)
-
Messinian (2)
-
Modelo Formation (1)
-
Puente Formation (1)
-
Tortonian (2)
-
-
Valentine Formation (1)
-
Wanapum Basalt (1)
-
Yakima Basalt (1)
-
-
Ogallala Formation (1)
-
Pliocene
-
lower Pliocene (9)
-
upper Pliocene (3)
-
-
Ringold Formation (1)
-
-
Paleogene
-
Claron Formation (1)
-
Duchesne River Formation (1)
-
Eocene
-
Absaroka Supergroup (1)
-
Ameki Formation (1)
-
Bridger Formation (2)
-
Bridgerian (3)
-
Green River Formation (6)
-
Lake Uinta (1)
-
lower Eocene
-
Aquia Formation (1)
-
Wasatchian (3)
-
Ypresian
-
London Clay (1)
-
-
-
middle Eocene
-
Bartonian (1)
-
Laney Shale Member (1)
-
Lutetian (2)
-
-
Ootsa Lake Group (2)
-
upper Eocene
-
Jackson Group (1)
-
Priabonian (1)
-
Tejon Formation (1)
-
Uinta Formation (1)
-
-
-
Hanna Formation (3)
-
Imo Shale (1)
-
lower Paleogene (1)
-
Oligocene
-
Fish Canyon Tuff (1)
-
Frio Formation (1)
-
Glendon Limestone (2)
-
lower Oligocene
-
Rupelian (2)
-
-
middle Oligocene
-
Marianna Limestone (1)
-
-
upper Oligocene (1)
-
Vicksburg Group (1)
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (7)
-
Puercan (4)
-
Torrejonian (3)
-
-
middle Paleocene (1)
-
Nacimiento Formation (1)
-
Ravenscrag Formation (1)
-
Tullock Member (1)
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (2)
-
-
-
Paleocene-Eocene Thermal Maximum (3)
-
Renova Formation (2)
-
Sespe Formation (3)
-
Wasatch Formation (2)
-
White River Group (1)
-
Wilcox Group (1)
-
-
upper Tertiary (1)
-
-
upper Cenozoic (4)
-
-
Coal Measures (1)
-
Dalradian (1)
-
Lake Bonneville (4)
-
Laurentide ice sheet (4)
-
Mesozoic
-
Cretaceous
-
Blairmore Group (2)
-
Colorado Group (3)
-
Dakota Formation (3)
-
Graneros Shale (1)
-
Lower Cretaceous
-
Agrio Formation (1)
-
Albian
-
upper Albian (1)
-
-
Aptian (2)
-
Cedar Mountain Formation (2)
-
Cloverly Formation (1)
-
Crato Formation (1)
-
Hauterivian (1)
-
Mannville Group (3)
-
McMurray Formation (1)
-
Mowry Shale (1)
-
Torok Formation (1)
-
Valanginian (1)
-
-
Mancos Shale (1)
-
Middle Cretaceous (5)
-
Nanushuk Group (1)
-
Potomac Group (1)
-
Upper Cretaceous
-
Bearpaw Formation (2)
-
Belle Fourche Shale (1)
-
Belly River Formation (1)
-
Campanian
-
Dinosaur Park Formation (8)
-
lower Campanian (1)
-
upper Campanian (7)
-
-
Carlile Shale (2)
-
Cenomanian
-
Dunvegan Formation (2)
-
upper Cenomanian (1)
-
-
Codell Sandstone Member (1)
-
Coker Formation (1)
-
Eutaw Formation (2)
-
Ferron Sandstone Member (4)
-
Fox Hills Formation (1)
-
Frontier Formation (3)
-
Greenhorn Limestone (2)
-
Gulfian
-
Aguja Formation (4)
-
Austin Group (1)
-
Eagle Ford Formation (5)
-
Taylor Marl (1)
-
Woodbine Formation (2)
-
-
Harebell Formation (1)
-
Hell Creek Formation (6)
-
Horseshoe Canyon Formation (8)
-
Javelina Formation (4)
-
Judith River Formation (5)
-
Kaiparowits Formation (2)
-
K-T boundary (7)
-
Lameta Formation (1)
-
Lance Formation (3)
-
Lewis Shale (1)
-
Maestrichtian
-
lower Maestrichtian (1)
-
upper Maestrichtian (2)
-
-
Mesaverde Group (1)
-
Middendorf Formation (1)
-
Milk River Formation (3)
-
Niobrara Formation (2)
-
Ojo Alamo Sandstone (1)
-
Oldman Formation (3)
-
Pierre Shale (6)
-
Prince Creek Formation (1)
-
Ripley Formation (1)
-
Saint Mary River Formation (1)
-
Santonian (5)
-
Senonian (18)
-
Sharon Springs Member (1)
-
Straight Cliffs Formation (1)
-
Tropic Shale (1)
-
Tuolumne Intrusive Suite (1)
-
Turonian
-
lower Turonian (1)
-
middle Turonian (2)
-
-
Wahweap Formation (2)
-
-
Viking Formation (1)
-
Whitemud Formation (2)
-
-
Franciscan Complex (1)
-
Great Valley Sequence (2)
-
Jurassic
-
Bazhenov Formation (1)
-
Carmel Formation (1)
-
Clarens Formation (1)
-
Coast Range Ophiolite (2)
-
Ferrar Group (1)
-
Lower Jurassic
-
Laberge Group (2)
-
Nordegg Member (1)
-
Pliensbachian (2)
-
Toarcian (2)
-
-
Middle Jurassic (1)
-
Posidonia Shale (1)
-
Upper Jurassic
-
Brushy Basin Member (1)
-
Buckner Formation (1)
-
Josephine Ophiolite (1)
-
Kimmeridgian (1)
-
Morrison Formation (4)
-
Salt Wash Sandstone Member (1)
-
Smackover Formation (1)
-
Swift Formation (1)
-
Tithonian (1)
-
-
-
Kayenta Formation (1)
-
Navajo Sandstone (3)
-
Orocopia Schist (1)
-
Triassic
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Upper Triassic
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Upper Carboniferous
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lower Paleozoic
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Lower Permian
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Primary terms
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Mesozoic
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Lower Cretaceous
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Carlile Shale (2)
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Codell Sandstone Member (1)
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Jurassic
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Kayenta Formation (1)
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Upper Triassic
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Chinle Formation (2)
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Paleozoic
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Upper Carboniferous
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Devonian
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Permian
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Lower Permian
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Wichita Group (1)
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Sauk Sequence (1)
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Tippecanoe Sequence (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Big Fish River
Crystal Structure of Near-Endmember Arrojadite-(BaNa) from Big Fish River, Yukon, Canada Available to Purchase
BOBDOWNSITE, A NEW MINERAL SPECIES FROM BIG FISH RIVER, YUKON, CANADA, AND ITS STRUCTURAL RELATIONSHIP WITH WHITLOCKITE-TYPE COMPOUNDS Available to Purchase
Nahpoite Na 2 HPO 4 , a new mineral from the Big Fish River area, Yukon Territory Available to Purchase
Satterlyite, a new hydroxyl-bearing ferrous phosphate from the Big Fish River area, Yukon Territory Available to Purchase
Maricite, a sodium iron phosphate, from the Big Fish River area, Yukon Territory, Canada Available to Purchase
Map of the Big Fish River Area, Yukon. Sites A and W are from this study; S... Available to Purchase
Tabular, colorless, euhedral crystals of bobdownsite from Big Fish River, Y... Available to Purchase
Early Tertiary thermotectonic history of the northern Yukon and adjacent Northwest Territories, Arctic Canada Free
Discreditation of bobdownsite and the establishment of criteria for the identification of minerals with essential monofluorophosphate (PO 3 F 2– ) Available to Purchase
Satterlyite, (Fe,Mg) 12 (PO 3 OH)(PO 4 ) 5 (OH,O) 6 : crystal structure and infrared absorption spectra Available to Purchase
A LIST OF THE POWDER DIFFRACTION d -SPACINGS AND INTENSITIES FOR ARROJADIT... Available to Purchase
—Mudstone and sandstone of Upper Cretaceous Tent Island (KTI) and lower Ter... Available to Purchase
Alluvial stratigraphy and geoarchaeology in the Big Fork River Valley, Minnesota: human response to Late Holocene environmental change Available to Purchase
Abstract The Late Quaternary geomorphology and stratigraphy of the Big Fork River valley, within the Rainy River basin of northern Minnesota, reveals evidence of prehistoric human interaction with late Holocene riverine environments. By 11 000 14 C BP, deglaciation made the region inhabitable by human groups using Clovis artefacts. Human habitation would also have been possible during the Moorhead low-water stage of glacial Lake Agassiz, starting at 10 500 14 C BP. Near its confluence with the Rainy River, the valley floor of the Big Fork valley consists of a floodplain complex and two terraces. The multi-component stratified Hannaford site is situated within the active floodplain. Overbank deposits contain artefacts in primary context, whereas artefacts within the point bar deposits are in secondary archaeological context; these deposits are associated with changing alluvial settings as the river moved eastward. Aggradation of the valley fill beneath the lowest surface (T 0 , floodplain complex) began by 3000 years ago and is associated with human activities focused on seasonal fishing and the use of riparian resources from 1300 to 650 14 C BP.
Huron River: Precambrian unconformities and alteration at and near Big Eric’s Crossing, Michigan Available to Purchase
Abstract Big Eric’s Crossing (Fig. 1, Site 1) is a county bridge acrossthe Huron River (NW¼NW¼Sec.35, T.52N., R.30W.), Skanee, Michigan 15-minute Quadrangle, about 12 mi (19 km) northeastof L/Anse, Michigan, along the road that continues north fromMain Street. The second locality (Site 2), a small, southeastfacinggranite hill, (SE¼:SE¼Sec.26) is about 1 mi (1.6 km)nrtheast of the bridge and lies about 600 ft (200 m) south of the road. Big Eric/s Crossing is a famous fishing spot on the HuronRiver, and Baraga County maintains a campground at the bridge.The river is high from late September until late May, so theoutcrops along the river are best visited during the middle andlate summer. Sites 2 and 3 are on private land. However, so long as visitsare brief, and visitors continue to respect the surface and theexposures, property owners in the Upper Peninsula tend not topost their lands.
SEDIMENTARY LAYER PROPERTIES OF GRADED-SHELF DEPOSITS, COLORADO GROUP (CRETACEOUS), SASKATCHEWAN Available to Purchase
Oxidative decomposition products of synthetic NaFePO 4 marićite: nano-textural and electrochemical characterization Available to Purchase
Basin-Scale Numerical Modeling to Test the Role of Buoyancy-Driven Fluid Flow and Heat Transfer in the Formation of Stratiform Zn-Pb-Ag Deposits in the Northern Mount Isa Basin Available to Purchase
Richard B. Laudon (1934-1998) Available to Purchase
Sedimentology and carbonate geochemistry of concretions from the Greenhorn marine cycle (Cenomanian-Turonian), eastern margin of the Western Interior Seaway Available to Purchase
Cenomanian to Turonian marine strata exposed in the Big Sioux River Valley of Iowa and South Dakota contain numerous concretion horizons. Concretion-bearing strata from the upper Dakota (type), Graneros, Greenhorn, and Carlile Formations were studied near their erosional limits along the eastern margin of the Western Interior Seaway. Concretion horizons formed in beds with concentrations of fossiliferous debris, including fish-scale siltstones with starved megaripple bedforms, inoceramid and inoceramid-ostreid packstones, and dense bioturbated accumulations of ammonoids and inoceramid, ostreid, and other bivalves. Concretions in the Carlile contain paleontologic and sedimentologic indicators for a general upward shallowing sequence, with nonmarine environments represented within the Codell Sandstone Member. Petrographic and stable isotopic data on diagenetic carbonates in the Carlile provide evidence for the early establishment of meteoric phreatic environments (δ 18 O = −7 ‰), although modified marine phreatic environments (δ 18 O = −2.5 ‰) are also represented. Variable degrees of fluid-rock interaction resulted in highly variable carbon isotopic compositions of diagenetic carbonates from both environments. Skeletal calcites from inoceramid and ostreid bivalves that inhabited dysaerobic benthic environments have anomalously low δ 18 O values and do not provide an accurate record of ambient seawater chemistry because of vital effects, possibly related to the activity of chemosynthetic symbiotic bacteria. Data from diagenetic carbonates in the Carlile are consistent with a proposed long-term secular trend of increasing oxygen isotopic ratios in Turonian (−2.5 ‰) to Maastrichtian (−0.5 ‰) marine carbonates from the Western Interior Seaway, probably related to global cooling. Petrographic and geochemical evidence for deep infiltration of dilute meteoric fluids during late Turonian subaerial exposure of Carlile strata, and relatively small marine phreatic–meteoric phreatic δ 18 O shifts in carbonate cements, are suggestive of humid paleoclimates along the eastern margin of the seaway, and conflict with prior suggestions of semiarid to slightly evaporitic paleoclimates in the area.