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all geography including DSDP/ODP Sites and Legs
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Africa
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International Ocean Discovery Program
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Expedition 351
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ODP Site 642 (3)
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West Pacific
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Ontong Java Plateau (10)
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Pacific region
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Para Brazil
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Chile
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Colombia
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Patagonia
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Peru
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United States
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Alabama
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Arizona
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Florida
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Honolulu County Hawaii
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Montana
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New York
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elements, isotopes
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carbon
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S-34/S-32 (63)
-
Si-30/Si-28 (2)
-
Sm-147/Nd-144 (46)
-
Sr-87 (2)
-
Sr-87/Sr-86 (413)
-
U-238/Pb-206 (3)
-
-
-
large-ion lithophile elements (24)
-
Lu/Hf (89)
-
metals
-
actinides
-
protactinium (1)
-
thorium
-
Th-230/Ra-226 (3)
-
Th-232/Th-230 (1)
-
U-238/Th-230 (2)
-
U-238/Th-232 (2)
-
-
uranium
-
U-238/Pb-204 (1)
-
U-238/Pb-206 (3)
-
U-238/Th-230 (2)
-
U-238/Th-232 (2)
-
U-238/U-234 (2)
-
-
-
alkali metals
-
lithium
-
Li-7/Li-6 (4)
-
-
potassium (17)
-
rubidium
-
Rb-87/Sr-86 (18)
-
-
sodium (7)
-
-
alkaline earth metals
-
barium (9)
-
beryllium
-
Be-10 (1)
-
Be-10/Be-9 (1)
-
-
calcium (11)
-
magnesium
-
Mg-26/Mg-24 (3)
-
-
radium
-
Ra-226 (2)
-
Th-230/Ra-226 (3)
-
-
strontium
-
Rb-87/Sr-86 (18)
-
Sr-87 (2)
-
Sr-87/Sr-86 (413)
-
-
-
aluminum (10)
-
antimony (3)
-
arsenic (5)
-
bismuth (2)
-
chromium (7)
-
cobalt (1)
-
copper (9)
-
gold (10)
-
hafnium
-
Hf-177/Hf-176 (185)
-
Hf-182 (1)
-
-
iron
-
Fe-56/Fe-54 (4)
-
ferric iron (3)
-
ferrous iron (3)
-
-
lead
-
Pb-206/Pb-204 (129)
-
Pb-207/Pb-204 (89)
-
Pb-207/Pb-206 (20)
-
Pb-208/Pb-204 (83)
-
Pb-208/Pb-206 (4)
-
Pb-210 (2)
-
U-238/Pb-204 (1)
-
U-238/Pb-206 (3)
-
-
manganese (3)
-
mercury (10)
-
molybdenum (5)
-
nickel (10)
-
niobium (31)
-
platinum group
-
iridium (2)
-
osmium
-
Os-188/Os-187 (19)
-
Re-187/Os-188 (5)
-
-
palladium (4)
-
palladium ores (5)
-
platinum ores (35)
-
rhodium (1)
-
ruthenium (2)
-
-
precious metals (15)
-
rare earths
-
cerium (7)
-
dysprosium (2)
-
europium (17)
-
lanthanum (12)
-
lutetium (19)
-
neodymium
-
Nd-144/Nd-143 (380)
-
Sm-147/Nd-144 (46)
-
-
samarium
-
Sm-147/Nd-144 (46)
-
-
scandium (1)
-
ytterbium (13)
-
yttrium (15)
-
-
rhenium
-
Re-187/Os-188 (5)
-
-
silver (5)
-
tantalum (15)
-
thallium (1)
-
tin (7)
-
titanium (30)
-
tungsten (4)
-
vanadium (1)
-
zinc (4)
-
zirconium (12)
-
-
nitrogen
-
N-15/N-14 (3)
-
organic nitrogen (1)
-
-
noble gases
-
argon
-
Ar-38/Ar-36 (2)
-
Ar-39 (1)
-
Ar-40 (1)
-
Ar-40/Ar-36 (4)
-
Ar-40/Ar-39 (19)
-
-
helium
-
He-3 (1)
-
He-4/He-3 (14)
-
-
krypton (1)
-
neon
-
Ne-22/Ne-20 (2)
-
Ne-22/Ne-21 (2)
-
-
radon
-
Rn-222 (1)
-
-
xenon (1)
-
-
oxygen
-
O-17/O-16 (2)
-
O-18 (1)
-
O-18/O-16 (175)
-
-
phosphorus (4)
-
selenium (3)
-
short-lived isotopes (2)
-
silicon
-
Si-30/Si-28 (2)
-
-
sulfur
-
S-33 (1)
-
S-33/S-32 (3)
-
S-34 (1)
-
S-34/S-32 (63)
-
-
tellurium (3)
-
trace metals (5)
-
-
fossils
-
Archaea (1)
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Primates
-
Hominidae (1)
-
simians (1)
-
-
-
-
-
Reptilia
-
Anapsida
-
Testudines (1)
-
-
Diapsida
-
Archosauria
-
Crocodilia (1)
-
dinosaurs (2)
-
-
-
-
-
-
-
Graptolithina
-
Graptoloidea (1)
-
-
ichnofossils (1)
-
Invertebrata
-
Arthropoda
-
Trilobitomorpha
-
Trilobita (2)
-
-
-
Brachiopoda (2)
-
Bryozoa (1)
-
Cnidaria
-
Anthozoa (1)
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (1)
-
-
-
Mollusca
-
Bivalvia (1)
-
Cephalopoda
-
Ammonoidea
-
Ammonites (4)
-
-
-
-
Porifera
-
Calcarea (1)
-
-
Protista
-
Foraminifera
-
Fusulinina
-
Fusulinidae (3)
-
-
Rotaliina
-
Globigerinacea
-
Globotruncanidae
-
Globotruncana (1)
-
-
-
-
-
Radiolaria (5)
-
-
-
Metazoa (1)
-
microfossils
-
Chitinozoa (1)
-
Conodonta (4)
-
Fusulinina
-
Fusulinidae (3)
-
-
-
palynomorphs
-
Chitinozoa (1)
-
Dinoflagellata (1)
-
miospores
-
pollen (4)
-
-
-
Plantae
-
algae
-
nannofossils (2)
-
-
Bryophyta (1)
-
Pteridophyta
-
Sphenopsida (1)
-
-
Spermatophyta
-
Angiospermae (1)
-
Gymnospermae
-
Coniferales (1)
-
Cordaitales (1)
-
-
-
-
-
geochronology methods
-
(U-Th)/He (32)
-
Ar/Ar (323)
-
exposure age (1)
-
fission-track dating (39)
-
He/He (1)
-
K/Ar (73)
-
Lu/Hf (89)
-
Nd/Nd (8)
-
paleomagnetism (96)
-
Pb/Pb (37)
-
Pb/Th (6)
-
Rb/Sr (60)
-
Re/Os (70)
-
Sm/Nd (80)
-
Sr/Sr (8)
-
tephrochronology (2)
-
Th/U (20)
-
thermochronology (66)
-
U/Pb (1180)
-
U/Th/Pb (34)
-
uranium disequilibrium (6)
-
-
geologic age
-
Cenozoic
-
Koobi Fora Formation (1)
-
lower Cenozoic (4)
-
middle Cenozoic (2)
-
Omo Group (1)
-
Quaternary
-
Holocene
-
upper Holocene (7)
-
-
Pleistocene
-
Bandelier Tuff (2)
-
Bishop Tuff (4)
-
lower Pleistocene (2)
-
middle Pleistocene (2)
-
upper Pleistocene (10)
-
-
upper Quaternary
-
Brunhes Chron (1)
-
-
-
Shungura Formation (1)
-
Tertiary
-
Calipuy Group (1)
-
Challis Volcanics (4)
-
lower Tertiary (12)
-
middle Tertiary
-
Masset Formation (1)
-
-
Neogene
-
Aguacate Group (1)
-
Miocene
-
Columbia River Basalt Group (10)
-
Grande Ronde Basalt (3)
-
lower Miocene
-
Burdigalian (1)
-
-
middle Miocene
-
Langhian (1)
-
-
Sarmatian (1)
-
upper Miocene
-
Messinian (3)
-
Pannonian (1)
-
-
-
Pliocene
-
lower Pliocene (5)
-
upper Pliocene (2)
-
-
upper Neogene (3)
-
-
Paleogene
-
Eocene
-
Absaroka Supergroup (1)
-
Chuckanut Formation (1)
-
Chumstick Formation (1)
-
Crescent Formation (1)
-
Green River Formation (1)
-
Lake Gosiute (1)
-
lower Eocene (11)
-
middle Eocene
-
Lutetian (1)
-
Tyee Formation (1)
-
-
Mirador Formation (1)
-
Ootsa Lake Group (1)
-
Swauk Formation (2)
-
Umpqua Formation (1)
-
upper Eocene
-
Priabonian (1)
-
-
-
lower Paleogene (6)
-
Oligocene
-
Fish Canyon Tuff (4)
-
Hemlock Conglomerate (1)
-
lower Oligocene (3)
-
upper Oligocene
-
Chattian (1)
-
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (3)
-
-
upper Paleocene
-
Thanetian (1)
-
-
-
Paleocene-Eocene Thermal Maximum (2)
-
Tyonek Formation (1)
-
-
upper Tertiary (1)
-
Zambales Ophiolite (1)
-
-
upper Cenozoic (16)
-
-
Dalradian (14)
-
Mesozoic
-
Bela Ophiolites (1)
-
Bisbee Group (2)
-
Cretaceous
-
Comanchean (1)
-
Lower Cretaceous
-
Agrio Formation (1)
-
Albian
-
upper Albian (1)
-
-
Aptian
-
lower Aptian (1)
-
-
Barremian (9)
-
Berriasian (6)
-
Bluesky Formation (1)
-
Cadomin Formation (1)
-
Christopher Formation (1)
-
Gething Formation (1)
-
Hauterivian (5)
-
Isachsen Formation (1)
-
Mural Limestone (1)
-
Spirit River Formation (1)
-
Valanginian (5)
-
-
Macae Formation (1)
-
Middle Cretaceous
-
Winton Formation (1)
-
-
Upper Cretaceous
-
Campanian
-
lower Campanian (1)
-
-
Cardium Formation (1)
-
Cenomanian
-
Dunvegan Formation (1)
-
lower Cenomanian (1)
-
upper Cenomanian (1)
-
-
Coniacian (3)
-
Elkhorn Mountains Volcanics (1)
-
Horseshoe Canyon Formation (1)
-
Javelina Formation (1)
-
Kanguk Formation (2)
-
Kodiak Formation (1)
-
K-T boundary (3)
-
Maestrichtian (5)
-
Santonian (3)
-
Senonian (8)
-
Tuolumne Intrusive Suite (12)
-
Turonian
-
lower Turonian (1)
-
-
-
-
Franciscan Complex (2)
-
Great Valley Sequence (5)
-
Jurassic
-
Bonanza Group (2)
-
Coast Range Ophiolite (3)
-
Fernie Formation (1)
-
Ferrar Group (8)
-
Kirkpatrick Basalt (1)
-
Ladner Group (1)
-
Lower Jurassic
-
Nordegg Member (1)
-
Pliensbachian (3)
-
Sinemurian (2)
-
Talkeetna Formation (1)
-
Toarcian (2)
-
Triassic-Jurassic boundary (5)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian
-
Yakoun Group (1)
-
-
-
Rajmahal Series (1)
-
Smartville Complex (1)
-
Upper Jurassic
-
Entrada Sandstone (1)
-
Galice Formation (3)
-
Jeanne d'Arc Formation (1)
-
Josephine Ophiolite (1)
-
Naknek Formation (1)
-
Oxfordian (2)
-
Tithonian (5)
-
-
-
lower Mesozoic (16)
-
middle Mesozoic (1)
-
Orocopia Schist (1)
-
Serra Geral Formation (2)
-
Triassic
-
Lower Triassic
-
Olenekian (1)
-
Permian-Triassic boundary (22)
-
-
Middle Triassic
-
Anisian (1)
-
Ladinian (2)
-
-
Moenkopi Formation (1)
-
Nicola Group (1)
-
Upper Triassic
-
Carnian (2)
-
Chinle Formation (3)
-
Norian (1)
-
Rhaetian (3)
-
Shinarump Member (1)
-
Triassic-Jurassic boundary (5)
-
-
-
upper Mesozoic (19)
-
Vaca Muerta Formation (4)
-
Yanshanian (9)
-
-
Moldanubian (7)
-
Paleozoic
-
Acatlan Complex (3)
-
Cambrian
-
Acadian (1)
-
Brigham Group (1)
-
Kanmantoo Group (2)
-
Lower Cambrian
-
Chilhowee Group (1)
-
Murphy Marble (1)
-
Terreneuvian (1)
-
Tommotian (1)
-
-
Middle Cambrian
-
Flathead Sandstone (1)
-
Mount Scott Granite (1)
-
-
Mount Read Volcanics (1)
-
Semri Series (1)
-
Tapeats Sandstone (1)
-
Upper Cambrian
-
Bonneterre Formation (1)
-
Furongian (3)
-
Goldenville Formation (1)
-
Pilgrim Formation (1)
-
-
-
Carboniferous
-
Diamond Peak Formation (1)
-
Lower Carboniferous
-
Asbian (2)
-
Dinantian (8)
-
-
Mississippian
-
Lower Mississippian
-
Tournaisian (4)
-
-
Middle Mississippian
-
Visean
-
upper Visean (1)
-
-
-
Redwall Limestone (1)
-
Upper Mississippian
-
Serpukhovian (3)
-
-
-
Namurian (1)
-
Pennsylvanian
-
Lower Pennsylvanian
-
Bashkirian (2)
-
-
Middle Pennsylvanian
-
Allegheny Group (1)
-
Moscovian (2)
-
-
Upper Pennsylvanian
-
Gzhelian (1)
-
Wescogame Formation (1)
-
-
Watahomigi Formation (1)
-
-
Upper Carboniferous
-
Stephanian (3)
-
Westphalian (3)
-
-
-
Devonian
-
Fisset Brook Formation (2)
-
Heemskirk Granite (1)
-
Lower Devonian
-
Emsian (2)
-
Shap Granite (1)
-
Siegenian (1)
-
-
Middle Devonian
-
Eifelian (3)
-
Givetian (1)
-
Marcellus Shale (1)
-
Onondaga Limestone (1)
-
Tioga Bentonite (1)
-
-
Old Red Sandstone (3)
-
Upper Devonian
-
Famennian (3)
-
Frasnian (3)
-
-
-
Earn Group (3)
-
Helderberg Group (1)
-
Horton Group (2)
-
Keyser Limestone (1)
-
lower Paleozoic
-
Bay of Islands Ophiolite (1)
-
Wilmington Complex (1)
-
-
middle Paleozoic
-
Hillabee Chlorite Schist (2)
-
-
Ordovician
-
Buchans Group (1)
-
Lower Ordovician
-
Arenigian
-
Ballantrae Complex (1)
-
-
Manx Group (1)
-
Tremadocian (2)
-
-
Meguma Group (2)
-
Middle Ordovician
-
Darriwilian (2)
-
Llanvirnian (1)
-
-
Skiddaw Slates (2)
-
Tetagouche Group (1)
-
Trenton Group (1)
-
Upper Ordovician
-
Caradocian
-
Borrowdale Volcanic Group (1)
-
-
Katian (2)
-
Sandbian (1)
-
-
Wild Bight Group (2)
-
-
Permian
-
Buckley Formation (1)
-
Coconino Sandstone (1)
-
Ecca Group (1)
-
Guadalupian (2)
-
Irati Formation (1)
-
Kaibab Formation (1)
-
Longtan Formation (1)
-
Lower Permian
-
Cisuralian (1)
-
-
Maokou Formation (1)
-
Middle Permian (8)
-
Shihezi Formation (1)
-
Toroweap Formation (1)
-
Upper Permian
-
Changxing Formation (1)
-
Lopingian
-
Changhsingian (1)
-
-
Permian-Triassic boundary (22)
-
Raniganj Formation (1)
-
Zechstein (1)
-
-
-
Pilot Shale (1)
-
Shoo Fly Complex (3)
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (1)
-
-
Wenlock (3)
-
-
Middle Silurian
-
McKenzie Formation (1)
-
Roberts Mountains Formation (1)
-
-
Upper Silurian
-
Cayugan
-
Tonoloway Limestone (1)
-
-
Pridoli (1)
-
-
-
Supai Formation (1)
-
Talchir Formation (1)
-
Talladega Group (2)
-
Tippecanoe Sequence (1)
-
upper Paleozoic
-
Garhwal Group (1)
-
-
Wissahickon Formation (1)
-
-
Phanerozoic (41)
-
Precambrian
-
Animikie Group (1)
-
Archean
-
Aravalli System (1)
-
Blake River Group (1)
-
Eoarchean (2)
-
Kalgoorlie System (1)
-
Mesoarchean (20)
-
Neoarchean
-
Dharwar Supergroup (2)
-
Jiaodong Group (1)
-
Sargur Group (2)
-
-
Paleoarchean
-
Hooggenoeg Formation (1)
-
-
Peninsular Gneiss (1)
-
Singhbhum Granite (1)
-
Timiskaming Group (2)
-
Warrawoona Group (1)
-
Yellowknife Group (2)
-
-
Chuar Group (1)
-
Cuddapah System (1)
-
Delhi Supergroup (2)
-
Eocambrian (1)
-
Fortescue Group (1)
-
Hadean (12)
-
Kingston Peak Formation (1)
-
Kisseynew Complex (3)
-
Levack Gneiss (1)
-
Lewisian Complex (4)
-
Nipissing Diabase (1)
-
Nonesuch Shale (1)
-
North Shore Volcanics (2)
-
Onverwacht Group (1)
-
Osler Series (1)
-
Pahrump Series (1)
-
Purcell System (1)
-
Sakoli Group (1)
-
Stillwater Complex (3)
-
Transvaal Supergroup (5)
-
Unkar Group (1)
-
upper Precambrian
-
Proterozoic
-
Algonkian
-
Baraboo Quartzite (2)
-
-
Banded Gneissic Complex (2)
-
Banxi Group (1)
-
Coldbrook Group (1)
-
Damara System (3)
-
Great Oxidation Event (1)
-
Huronian (1)
-
Lewisian (1)
-
Malmani Subgroup (1)
-
Mesoproterozoic
-
Belt Supergroup (4)
-
Freda Sandstone (1)
-
Gawler Range Volcanics (3)
-
Hiltaba Suite (2)
-
Laxfordian (1)
-
Missoula Group (1)
-
Newland Limestone (1)
-
Ravalli Group (1)
-
Stenian (4)
-
-
Neoproterozoic
-
Cryogenian (14)
-
Doushantuo Formation (1)
-
Ediacaran (28)
-
Hadrynian
-
Fourchu Group (1)
-
-
Maranon Complex (1)
-
Marinoan (1)
-
Moine Supergroup (3)
-
Moinian (3)
-
Nantuo Formation (1)
-
Riphean
-
upper Riphean (2)
-
-
Sturtian (2)
-
Tonian (8)
-
Torridonian (1)
-
Vendian (22)
-
-
Paleoproterozoic
-
Baker Lake Group (1)
-
Birimian (3)
-
Orosirian (3)
-
Rhyacian (1)
-
Rooiberg Group (3)
-
Rustenburg Layered Suite (3)
-
Svecofennian (1)
-
Thomson Formation (1)
-
Virginia Formation (1)
-
Willyama Supergroup (4)
-
-
Pocatello Formation (1)
-
Sinian
-
Doushantuo Formation (1)
-
Nantuo Formation (1)
-
-
Windermere System (1)
-
-
-
Ventersdorp Supergroup (4)
-
Waterberg System (2)
-
Witwatersrand Supergroup (1)
-
-
Rhenohercynian (4)
-
Saxothuringian (6)
-
Vindhyan (1)
-
-
igneous rocks
-
extrusive rocks (9)
-
igneous rocks
-
carbonatites (53)
-
feldspathoid rocks (6)
-
granophyre (2)
-
hypabyssal rocks (15)
-
kamafugite (1)
-
kimberlite (27)
-
peperite (3)
-
phoscorites (2)
-
picrite (19)
-
plutonic rocks
-
anorthosite (25)
-
appinite (8)
-
diabase
-
diabase porphyry (2)
-
quartz diabase (1)
-
tholeiitic dolerite (7)
-
-
diorites
-
diorite porphyry (4)
-
ferrodiorite (2)
-
microdiorite (2)
-
plagiogranite (18)
-
quartz diorites (20)
-
tonalite
-
enderbite (5)
-
-
trondhjemite (21)
-
-
essexite (2)
-
gabbros
-
alkali gabbros
-
teschenite (2)
-
-
anorthositic gabbro (1)
-
norite (15)
-
olivine gabbro (3)
-
troctolite (12)
-
-
granites
-
adamellite (3)
-
alkali granites (6)
-
aplite (14)
-
A-type granites (67)
-
biotite granite (9)
-
charnockite (19)
-
felsite (2)
-
granite porphyry (10)
-
granosyenite (1)
-
I-type granites (45)
-
leucogranite (45)
-
microgranite (4)
-
monzogranite (48)
-
muscovite granite (1)
-
rapakivi (9)
-
S-type granites (41)
-
two-mica granite (8)
-
-
granodiorites
-
granodiorite porphyry (2)
-
-
ijolite (5)
-
lamproite (10)
-
lamprophyres
-
camptonite (4)
-
minette (7)
-
monchiquite (3)
-
spessartite (2)
-
vogesite (1)
-
-
monzodiorite (32)
-
monzonites
-
mangerite (5)
-
-
pegmatite (63)
-
quartz monzonite (18)
-
syenites
-
albitite (3)
-
alkali syenites (4)
-
bostonite (1)
-
granosyenite (1)
-
nepheline syenite
-
agpaite (4)
-
foyaite (1)
-
miaskite (1)
-
-
pulaskite (1)
-
quartz syenite (7)
-
shonkinite (1)
-
syenite porphyry (1)
-
-
syenodiorite (1)
-
ultramafics
-
chromitite (9)
-
hornblendite (3)
-
olivinite (1)
-
peridotites
-
dunite (16)
-
garnet lherzolite (2)
-
garnet peridotite (1)
-
harzburgite (20)
-
lherzolite (16)
-
spinel lherzolite (2)
-
spinel peridotite (3)
-
-
pyroxenite
-
clinopyroxenite (10)
-
garnet pyroxenite (2)
-
orthopyroxenite
-
bronzitite (1)
-
-
websterite (1)
-
-
-
urtite (1)
-
-
porphyry
-
vitrophyre (2)
-
-
volcanic rocks
-
adakites (40)
-
andesites
-
andesite porphyry (1)
-
boninite (19)
-
-
basalts
-
alkali basalts
-
alkali olivine basalt (2)
-
hawaiite (8)
-
mugearite (6)
-
spilite (1)
-
trachybasalts (9)
-
trachydolerite (2)
-
-
flood basalts (79)
-
mid-ocean ridge basalts (78)
-
ocean-island basalts (60)
-
oceanite (1)
-
olivine tholeiite (4)
-
shoshonite (22)
-
tholeiite (36)
-
tholeiitic basalt (12)
-
trap rocks (13)
-
-
basanite
-
ankaramite (2)
-
-
benmoreite (2)
-
dacites (61)
-
glasses
-
perlite (2)
-
volcanic glass (6)
-
-
keratophyre
-
albitophyre (1)
-
-
komatiite (18)
-
latite (4)
-
leucitite (2)
-
melilitite (7)
-
nephelinite (9)
-
phonolites (19)
-
pyroclastics
-
ash-flow tuff (8)
-
hyaloclastite (2)
-
ignimbrite (67)
-
pumice (13)
-
rhyolite tuff (4)
-
scoria (5)
-
tuff (67)
-
tuffite (1)
-
welded tuff (5)
-
-
quartz latite (1)
-
rhyodacites (12)
-
rhyolites
-
comendite (2)
-
pantellerite (1)
-
quartz porphyry (2)
-
rhyolite porphyry (1)
-
-
tephrite (3)
-
trachyandesites (23)
-
trachytes (24)
-
vitrophyre (2)
-
-
-
ophiolite (96)
-
volcanic ash (11)
-
wehrlite (10)
-
-
metamorphic rocks
-
K-bentonite (1)
-
metabentonite (1)
-
metamorphic rocks
-
amphibolites (47)
-
cataclasites (3)
-
eclogite (26)
-
gneisses
-
augen gneiss (9)
-
banded gneiss (1)
-
biotite gneiss (4)
-
granite gneiss (19)
-
orthogneiss (46)
-
paragneiss (19)
-
sillimanite gneiss (1)
-
tonalite gneiss (4)
-
-
granulites (34)
-
hornfels (7)
-
impactites (1)
-
listwanite (1)
-
marbles
-
calciphyre (1)
-
-
metaigneous rocks
-
meta-anorthosite (2)
-
metabasalt (16)
-
metabasite (12)
-
metadacite (2)
-
metadiabase (2)
-
metadiorite (2)
-
metagabbro (17)
-
metagranite (15)
-
metakomatiite (2)
-
metaperidotite (1)
-
metarhyolite (6)
-
metatuff (1)
-
serpentinite (17)
-
-
metaplutonic rocks (19)
-
metasedimentary rocks
-
khondalite (1)
-
meta-arkose (1)
-
metachert (1)
-
metaconglomerate (3)
-
metagraywacke (4)
-
metapelite (24)
-
metasandstone (4)
-
metasiltstone (1)
-
paragneiss (19)
-
-
metasomatic rocks
-
fenite (2)
-
greisen
-
beresite (2)
-
-
serpentinite (17)
-
skarn (37)
-
-
metavolcanic rocks (46)
-
migmatites
-
agmatite (1)
-
anatexite (1)
-
-
mylonites
-
blastomylonite (2)
-
pseudotachylite (6)
-
ultramylonite (2)
-
-
phyllites (4)
-
phyllonites (1)
-
quartzites (15)
-
schists
-
blueschist (7)
-
greenschist (1)
-
greenstone (10)
-
hornblende schist (1)
-
muscovite schist (1)
-
-
-
ophiolite (96)
-
turbidite (20)
-
-
meteorites
-
meteorites
-
stony meteorites
-
achondrites
-
howardite (1)
-
lunar meteorites (1)
-
Martian meteorites
-
SNC Meteorites
-
shergottite (1)
-
-
-
-
chondrites
-
carbonaceous chondrites
-
CV chondrites
-
Allende Meteorite (1)
-
-
-
enstatite chondrites (1)
-
-
-
-
-
minerals
-
alloys
-
carbides
-
moissanite (1)
-
-
-
antimonides (2)
-
arsenides
-
arsenopyrite (8)
-
gersdorffite (1)
-
sperrylite (5)
-
-
bismuthides
-
michenerite (1)
-
-
carbonates
-
ankerite (3)
-
aragonite (1)
-
calcite (12)
-
dolomite (5)
-
siderite (1)
-
spurrite (1)
-
trona (1)
-
-
copper minerals (1)
-
halides
-
chlorides
-
eudialyte (1)
-
halite (5)
-
sylvite (1)
-
-
fluorides
-
clinohumite (1)
-
fluorite (7)
-
topaz (1)
-
-
-
hydrates (5)
-
iron minerals (1)
-
K-bentonite (1)
-
metabentonite (1)
-
minerals (7)
-
native elements
-
diamond
-
microdiamond (1)
-
-
graphite (5)
-
-
oxides
-
baddeleyite (25)
-
cassiterite (17)
-
chrome spinel (9)
-
chromite (8)
-
corundum (3)
-
franklinite (1)
-
hematite (6)
-
hercynite (1)
-
hibonite (1)
-
hydroxides
-
oxyhydroxides (1)
-
-
ilmenite (11)
-
iron oxides (21)
-
magnesium oxides (1)
-
magnetite (26)
-
niobates
-
betafite (1)
-
columbite (8)
-
pyrochlore (6)
-
-
perovskite (7)
-
rutile (16)
-
sapphire (1)
-
spinel (13)
-
tantalates
-
betafite (1)
-
microlite (3)
-
tantalite (3)
-
-
thorianite (1)
-
titanium oxides (4)
-
titanomagnetite (6)
-
ulvospinel (1)
-
uraninite (3)
-
-
phosphates
-
amblygonite (1)
-
apatite (98)
-
chlorapatite (2)
-
fluorapatite (4)
-
merrillite (1)
-
monazite (71)
-
xenotime (11)
-
-
platinum minerals (3)
-
silicates
-
aluminosilicates (1)
-
borosilicates (1)
-
chain silicates
-
aenigmatite group
-
sapphirine (3)
-
-
amphibole group
-
clinoamphibole
-
actinolite (2)
-
arfvedsonite (4)
-
glaucophane (2)
-
grunerite (1)
-
hastingsite (1)
-
hornblende (55)
-
kaersutite (2)
-
pargasite (1)
-
richterite (2)
-
riebeckite (3)
-
tschermakite (1)
-
-
-
pyroxene group
-
clinopyroxene
-
aegirine (2)
-
augite (3)
-
chrome diopside (1)
-
clinoenstatite (1)
-
diopside (4)
-
hedenbergite (1)
-
jadeite (1)
-
pigeonite (1)
-
spodumene (1)
-
-
orthopyroxene
-
enstatite (3)
-
-
-
wollastonite group
-
wollastonite (2)
-
-
-
feldspathoids (1)
-
framework silicates
-
feldspar group
-
alkali feldspar
-
adularia (11)
-
amazonite (1)
-
anorthoclase (1)
-
K-feldspar (22)
-
microcline (1)
-
orthoclase (1)
-
sanidine (12)
-
-
antiperthite (1)
-
plagioclase
-
albite (7)
-
anorthite (3)
-
-
-
leucite (1)
-
nepheline group
-
nepheline (3)
-
-
pseudoleucite (1)
-
silica minerals
-
amethyst (1)
-
cristobalite (1)
-
jasper (1)
-
quartz (43)
-
tridymite (1)
-
-
sodalite group
-
genthelvite (1)
-
helvite (1)
-
-
zeolite group
-
analcime (1)
-
clinoptilolite (1)
-
mordenite (1)
-
-
-
orthosilicates
-
nesosilicates
-
andalusite (1)
-
clinohumite (1)
-
datolite group
-
datolite (1)
-
-
dumortierite (1)
-
euclase (1)
-
garnet group
-
almandine (1)
-
andradite (3)
-
grossular (2)
-
hydrogarnet
-
hydrogrossular (1)
-
-
spessartine (2)
-
vanadium garnet (1)
-
-
kyanite (3)
-
merwinite (1)
-
olivine group
-
fayalite (2)
-
forsterite (2)
-
olivine (47)
-
ringwoodite (1)
-
wadsleyite (1)
-
-
sillimanite (3)
-
spurrite (1)
-
staurolite (2)
-
titanite group
-
titanite (46)
-
-
topaz (1)
-
zircon group
-
thorite (1)
-
zircon (983)
-
-
-
sorosilicates
-
bertrandite (1)
-
epidote group
-
allanite (5)
-
epidote (2)
-
zoisite (1)
-
-
lawsonite (2)
-
melilite group
-
melilite (3)
-
-
-
-
ring silicates
-
aquamarine (1)
-
beryl (4)
-
cordierite (1)
-
emerald (2)
-
eudialyte (1)
-
tourmaline group
-
elbaite (2)
-
foitite (1)
-
schorl (1)
-
-
-
sheet silicates
-
chlorite group
-
chlorite (8)
-
-
clay minerals
-
dickite (4)
-
kaolinite (9)
-
montmorillonite (1)
-
smectite (6)
-
-
ekanite (1)
-
illite (6)
-
mica group
-
biotite (70)
-
lepidolite (1)
-
lepidomelane (1)
-
muscovite (40)
-
phengite (4)
-
phlogopite (20)
-
-
petalite (2)
-
pyrophyllite (4)
-
sericite (9)
-
serpentine group
-
antigorite (1)
-
chrysotile (1)
-
lizardite (2)
-
-
talc (1)
-
-
-
sulfates
-
alunite (14)
-
anhydrite (5)
-
barite (3)
-
-
sulfides
-
arsenopyrite (8)
-
bornite (2)
-
chalcopyrite (20)
-
cooperite (1)
-
copper sulfides (6)
-
cubanite (1)
-
galena (6)
-
genthelvite (1)
-
gersdorffite (1)
-
helvite (1)
-
iron sulfides (1)
-
laurite (4)
-
marcasite (2)
-
molybdenite (42)
-
nickel sulfides (5)
-
pentlandite (7)
-
pyrite (29)
-
pyrrhotite (14)
-
sphalerite (4)
-
stibnite (1)
-
talnakhite (1)
-
troilite (1)
-
ullmannite (1)
-
-
sulfosalts (1)
-
tellurides
-
altaite (1)
-
calaverite (1)
-
hessite (1)
-
tellurobismuthite (1)
-
-
tungstates
-
scheelite (5)
-
wolframite (3)
-
-
ultrabasite (1)
-
wehrlite (10)
-
-
Primary terms
-
absolute age (1444)
-
Africa
-
Afar (6)
-
Blue Nile (1)
-
Central Africa
-
Angola (5)
-
Congo (2)
-
Congo Democratic Republic (1)
-
-
Congo Craton (5)
-
East Africa
-
Afar Depression (6)
-
Djibouti (1)
-
Eritrea (1)
-
Ethiopia
-
Omo Valley (1)
-
-
Ethiopian Rift (8)
-
Kenya
-
East Turkana Basin (1)
-
Kenya Rift valley (5)
-
Lake Magadi (1)
-
Nakuru Basin (1)
-
Turkana District (1)
-
-
Lake Natron (1)
-
Lake Turkana (4)
-
Malawi (1)
-
Sudan (4)
-
Tanzania
-
Oldoinyo Lengai (2)
-
-
Turkana Basin (7)
-
Uganda (2)
-
Zambia (5)
-
-
East African Lakes
-
Lake Baringo (1)
-
Lake Magadi (1)
-
Lake Natron (1)
-
Lake Turkana (4)
-
-
East African Rift (19)
-
Gregory Rift (2)
-
Kalahari Desert (1)
-
Limpopo Belt (10)
-
Madagascar
-
Mahajanga Basin (1)
-
-
Mozambique Belt (3)
-
Nile River (1)
-
North Africa
-
Algeria
-
Ahaggar (1)
-
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (5)
-
High Atlas (2)
-
-
-
Ceuta (1)
-
Egypt
-
Eastern Desert (7)
-
Kosseir Egypt (1)
-
Nile Delta (1)
-
Sinai Egypt (3)
-
-
Ghadames Basin (1)
-
Illizi Basin (1)
-
Libya (3)
-
Maghreb (2)
-
Morocco
-
Marrakech Morocco (1)
-
Moroccan Atlas Mountains
-
Anti-Atlas (5)
-
High Atlas (2)
-
-
Rif (7)
-
-
Tell (1)
-
Tunisia (2)
-
-
Nubian Shield (13)
-
Red Sea Hills (1)
-
Sahara (2)
-
Southern Africa
-
Barberton greenstone belt (4)
-
Botswana (8)
-
Gariep Belt (1)
-
Kaapvaal Craton (24)
-
Kalahari Craton (5)
-
Karoo Basin (9)
-
Lesotho (1)
-
Namaqualand (5)
-
Namaqualand metamorphic complex (4)
-
Namibia
-
Damara Belt (5)
-
Kaoko Belt (3)
-
-
Orange River (1)
-
South Africa
-
Bushveld Complex (31)
-
Cape fold belt (1)
-
Cape Province region (1)
-
Eastern Cape Province South Africa
-
Cape Town South Africa (2)
-
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Gauteng South Africa (1)
-
KwaZulu-Natal South Africa
-
Tugela Basin (1)
-
-
Limpopo South Africa (3)
-
Merensky Reef (4)
-
Mpumalanga South Africa (2)
-
Murchison greenstone belt (1)
-
Northern Cape Province South Africa (4)
-
Transvaal region (7)
-
Western Cape Province South Africa (2)
-
Witwatersrand (1)
-
-
Swaziland (3)
-
Zimbabwe
-
Great Dyke (2)
-
-
-
West Africa
-
Benue Valley (2)
-
Cameroon
-
Lake Nyos (1)
-
-
Chad (2)
-
Ivory Coast (3)
-
Mali (2)
-
Mauritania
-
Richat Mountain (1)
-
-
Niger (3)
-
Nigeria
-
Jos Plateau (1)
-
-
Sierra Leone (1)
-
-
West African Craton (3)
-
West African Shield (2)
-
Zambezi Valley (1)
-
Zimbabwe Craton (7)
-
-
Antarctica
-
Amundsen Sea (1)
-
Antarctic Peninsula
-
Graham Land (3)
-
Larsen Ice Shelf (1)
-
-
East Antarctica (10)
-
Ellsworth Land
-
Ellsworth Mountains (1)
-
-
James Ross Island (3)
-
Marie Byrd Land (6)
-
Queen Maud Land
-
Schirmacher Hills (1)
-
Sor-Rondane Mountains (1)
-
-
Ross Island (3)
-
South Orkney Islands (1)
-
South Pole (1)
-
South Shetland Islands
-
Deception Island (2)
-
King George Island (1)
-
-
Transantarctic Mountains
-
Horlick Mountains
-
Ohio Range (1)
-
-
Pensacola Mountains
-
Dufek Intrusion (1)
-
-
-
Victoria Land
-
Allan Hills (3)
-
McMurdo dry valleys
-
Wright Valley (1)
-
-
Mount Melbourne (1)
-
Wilson Terrane (1)
-
-
West Antarctica (7)
-
-
Arctic Ocean
-
Alpha Cordillera (5)
-
Amerasia Basin (8)
-
Barents Sea
-
White Sea (1)
-
-
Beaufort Sea (1)
-
Canada Basin (4)
-
Chukchi Sea (1)
-
East Siberian Sea (2)
-
Eurasia Basin (2)
-
Kara Sea (2)
-
Lomonosov Ridge (2)
-
Makarov Basin (1)
-
Mid-Arctic Ocean Ridge (2)
-
Norwegian Sea
-
Icelandic Plateau (1)
-
Jan Mayen Ridge (2)
-
Knipovich Ridge (1)
-
Kolbeinsey Ridge (2)
-
Mohns Ridge (1)
-
More Basin (1)
-
Voring Basin (4)
-
Voring Plateau (6)
-
-
Yermak Plateau (1)
-
-
Arctic region
-
Greenland
-
East Greenland (22)
-
Greenland ice sheet (1)
-
Igaliku Complex (1)
-
Jameson Land (2)
-
Kangerlussuaq (2)
-
Milne Land (1)
-
Northern Greenland (5)
-
Peary Land (2)
-
Scoresby Sund (1)
-
Skaergaard Intrusion (1)
-
South Greenland (4)
-
West Greenland (7)
-
-
Jan Mayen (3)
-
Russian Arctic
-
Franz Josef Land (7)
-
New Siberian Islands (2)
-
Severnaya Zemlya (1)
-
Wrangel Island (4)
-
-
Svalbard
-
Spitsbergen
-
Spitsbergen Island (1)
-
-
-
-
Asia
-
Altai Mountains
-
Chuya Alps (1)
-
Gorny Altai (10)
-
Kalba Range (1)
-
Kuznetsk Alatau (6)
-
Mongolian Altai (1)
-
-
Altai Russian Federation
-
Gorny Altai (10)
-
-
Altai-Sayan region (13)
-
Amur region (3)
-
Amur Russian Federation
-
Bureya Russian Federation (1)
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Invertebrata
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Macae Formation (1)
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Coniacian (3)
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Franciscan Complex (2)
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Triassic-Jurassic boundary (5)
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upper Mesozoic (19)
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alkali metals
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potassium (17)
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calcium (11)
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magnesium
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Mg-26/Mg-24 (3)
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radium
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Ra-226 (2)
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Th-230/Ra-226 (3)
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strontium
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Rb-87/Sr-86 (18)
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Sr-87/Sr-86 (413)
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hafnium
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Hf-177/Hf-176 (185)
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iron
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Pb-206/Pb-204 (129)
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Pb-208/Pb-204 (83)
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Re-187/Os-188 (5)
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Nd-144/Nd-143 (380)
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Re-187/Os-188 (5)
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Mexico
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North America
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
magmatism
The valence states of Nb and Ta in magmatic-hydrothermal systems: Insights from combined SXAS and XPS analyses of titanite and ilmenite in two Chinese anorogenic suites Available to Purchase
Formation of bonanza Au-Ag-telluride ores in epithermal systems: Constraints from Cu-O isotopes and modeling Available to Purchase
Episodic magmatism contributes to sub-seafloor copper mineralization: Insights from textures and geochemistry of zoned pyrite in the Ashele VMS deposit Available to Purchase
Timing of vein-hosted copper mineralization and its structural setting in the Upper Paleozoic sedimentary rocks of SW Ireland Available to Purchase
Lithium from magma to mine in an early Yellowstone hotspot caldera Open Access
Superhydrous magmas, flat subduction, and cool transcrustal continental arc batholiths Available to Purchase
Insights into the chemical evolution of sub-arc magmas from the high-pressure electrical conductivity of basaltic and andesitic magmas Open Access
Geochemical transition from Miocene–Pliocene to Quaternary arc volcanism in the northern Sierra Nevada, California Available to Purchase
ABSTRACT Miocene–Pliocene volcanism around Lake Tahoe, California/Nevada, USA, part of the Southern Ancestral Cascades arc, ceased at around 3 Ma as the southern edge of the subducting Juan de Fuca plate migrated north of the region. Post–3 Ma, arc volcanism continued north of Lake Tahoe, but modern subduction and arc volcanism now occur only north of the Lassen volcanic center. Miocene–Pliocene Tahoe arc lavas appear to include an older mantle source component that is not common in Quaternary Lassen arc rocks. The goal of this work was to investigate how magma sources and/or volcanic processes transitioned in the northern Sierra Nevada between Lake Tahoe and Lassen. The Sierra Nevada between Lake Tahoe and Lassen, or the North Sierra segment of the Ancestral Cascades, includes eroded remnants of Ancestral Cascades volcanic rocks, including lava flow complexes, intrusions, and landslide/debris-flow deposits. Lava samples from the North Sierra segment include calc-alkaline basalts to dacites, with rare rhyolites. All North Sierra segment lavas exhibit normalized incompatible-element patterns with negative Nb, Ta, and Ti anomalies and positive Pb, Sr, and Ba anomalies. The North Sierra segment is geochemically split into two parts: a northern group including lavas from the Susanville area, and a southern group consisting of arc rocks from the Portola, Sierraville, Henness Pass, and Sagehen areas. With the exception of the Sagehen area, the North Sierra segment shows little variation in radiogenic isotope ratios with SiO 2 , indicating that assimilation of crustal rocks was outweighed by liquid-crystal crystallization during magma evolution. Trace-element and isotopic ratios in mafic rocks of the northern group are more typical of Lassen area Quaternary volcanic rocks, whereas those of southern group mafic rocks are more typical of Miocene–Pliocene arc lavas of the Lake Tahoe area. The isotopic distinction between Lassen-like and Tahoe-like arc lavas is likely controlled by basement age and lithology, where Lassen-like magmas were derived largely by mantle wedge melting and Tahoe-like magmas were primarily partial melts of metasomatized Sierran lithospheric mantle. The Susanville area represents the “transition zone” between these two geochemically distinct primary magma sources.
Early Miocene to Pliocene magmatic and structural evolution of the Gulf of California margin in central Baja California (Mexico): The Mulegé–La Trinidad region, Baja California Sur Available to Purchase
ABSTRACT The volcanic stratigraphy of the central Gulf of California margin of the Baja California peninsula preserves a valuable record of the transition from subduction of the Farallon plate (24–12 Ma) to oblique rifting (<12 Ma). Although strike-slip faults (as well as normal faults) are common in oblique rifts and are abundant on the new (younger than 6 Ma) seafloor in the Gulf of California, none has been previously reported in the onshore central Baja California margin. This study focused on a previously unmapped region in the central Baja California margin near Mulegé, where we identified a strike-slip fault, termed the Potrero fault, and described the regional magmatic and structural context for this fault. We did this by using geologic mapping of volcanic-volcaniclastic lithofacies, supported by petrography, geochemistry, and 40Ar/39Ar geochronology. The Potrero fault is a vertical fault that strikes N10°W, with dextral-oblique (down-to-the-east) slip. This fault juxtaposes older rocks on the west with younger rocks on the east. The older rocks on the west side of the Potrero fault are assigned to the Middle Comondú Group, which is early Miocene in age. They consist largely of a >800 m red bed sequence of coarse-grained andesitic volcanic debris-flow deposits (proximal facies) that transition westward into fluvial conglomerates and sandstones (distal facies). The proximal facies has interstratified coarse-grained trachyandesite block-and-ash-flow tuffs with a 40Ar/39Ar age of 18.72 ± 0.24 Ma. This section is cut by mafic- to intermediate-composition dikes, with lesser plugs, that have 40Ar/39Ar ages of 16.88 ± 0.30 Ma to 14.85 ± 0.05 Ma. This early Miocene assemblage is truncated by an angular unconformity and overlain by Pliocene high-Sr/Y trachyandesite lavas, with an 40Ar/39Ar age of 4.02 ± 0.04 Ma. The younger rocks on the east side of the Potrero fault are assigned to the Upper Comondú Group, which is middle to late Miocene in age. This unit is dominated by small lava shields, with diameters of 2–9 km and thicknesses up to 300 m. The lava shields have basaltic andesite, basaltic trachyandesite, andesite, high-Sr/Y trachyandesite, and dacite compositions, with 40Ar/39Ar ages of 13.39 ± 0.03 Ma to 10.74 ± 0.08 Ma (four samples). At two localities in the map area, the Upper Comondú Group lava shields rest in angular unconformity on the Middle Comondú Group red beds and dikes, and the eruptive equivalents of the dikes are missing along this unconformity. We correlated this unconformity with the unconformity at the top of the Middle Comondú Group on the west side of the Potrero fault to estimate a vertical component of slip of at least 800 m down-to-the-east across the Potrero fault. The lateral component of slip is not known, because the regions to the north and south are unmapped, so piercing points cannot be identified. The Middle Comondú Group in the Mulegé–La Trinidad area forms part of a regionally extensive, early Miocene lithostratigraphic unit, hundreds of meters thick, that outcrops for a distance of 500 km along the central to southern Gulf of California margin. It thickens and coarsens eastward, through what is now the Concepción Peninsula, where it also contains early Miocene dikes and hypabyssal intrusions and is similarly capped by an angular unconformity, with eruptive equivalents of the dikes and intrusions missing along the unconformity. We propose that the laterally extensive Middle Comondú Group was deposited in a rift basin, bounded by a west-dipping normal fault system that lay to the east of what is now the Concepción Peninsula, in the present-day offshore Gulf of California. We infer that the thick, coarse-grained volcanic andesitic debris-flow deposits of the Middle Comondú Group were shed from large andesite arc stratovolcanoes (Comondú arc) that also lay to the east in the present-day Gulf of California. We interpret the volumetrically minor block-and-ash-flow tuffs, dikes, and hypabyssal intrusions of the Middle Comondú Group to record minor magmatism in a forearc position. We also suggest that the angular unconformity at the top of the Middle Comondú Group records thermal uplift that occurred as the arc axis swept westward (trenchward) into the region, at ca. 14 Ma, due to continued slab rollback that began in the Oligocene under western Mexico. The Upper Comondú Group lavas in the Mulegé–La Trinidad area form part of a Middle to Upper Miocene lithostratigraphic unit, hundreds of meters thick, which outcrops for a distance of 700 km along the central to southern Gulf of California margin. This unit consists largely of andesite and basaltic andesite lavas erupted from stratovolcanoes in the axis of the Comondú arc. The Upper Comondú Group lavas thicken dramatically eastward toward the Bahía Concepción fault, a down-to-the-west normal fault that bounds the Concepción Peninsula on its west side. We thus infer that this fault became active in middle Miocene time (14 Ma). This fault records westward encroachment of normal faulting concurrent with the westward sweep of the arc axis, from the Gulf of California into Baja California. The Pliocene high-Sr/Y basaltic trachyandesite lavas that form the structurally highest part of the Mulegé–La Trinidad area form an erosional escarpment that does not extend to the Potrero fault, so the lavas cannot be used to determine whether the Potrero fault was active before, during, or after their eruption. The Pliocene high-Sr/Y basaltic trachyandesite lavas are a previously unidentified part of the regional postsubduction suite of “bajaites,” attributed to slab window magmatism.