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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Angola (1)
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Congo Democratic Republic
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Equatorial Guinea (1)
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East Africa
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North Africa
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Egypt
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Southern Africa
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Newfoundland and Labrador
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Ontario
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Quebec
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Russian Arctic
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International Ocean Discovery Program
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-
tritium (1)
-
-
isotope ratios (109)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
Be-10 (4)
-
C-14 (22)
-
Cl-36 (1)
-
Pb-206/Pb-204 (7)
-
Pb-207/Pb-204 (6)
-
Pb-208/Pb-204 (6)
-
Pb-210 (1)
-
Th-232/Th-230 (1)
-
tritium (1)
-
U-235 (1)
-
U-238 (2)
-
U-238/Pb-206 (1)
-
U-238/U-235 (1)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
B-11/B-10 (1)
-
C-13 (1)
-
C-13/C-12 (45)
-
Cl-37/Cl-35 (1)
-
D/H (17)
-
deuterium (2)
-
He-4/He-3 (1)
-
Hf-177/Hf-176 (5)
-
N-15/N-14 (2)
-
Nd-144/Nd-143 (10)
-
O-17/O-16 (3)
-
O-18 (1)
-
O-18/O-16 (57)
-
Pb-206 (1)
-
Pb-206/Pb-204 (7)
-
Pb-207 (1)
-
Pb-207/Pb-204 (6)
-
Pb-207/Pb-206 (1)
-
Pb-208 (1)
-
Pb-208/Pb-204 (6)
-
S-34/S-32 (21)
-
Sr-87/Sr-86 (24)
-
U-238/Pb-206 (1)
-
-
-
Lu/Hf (5)
-
metals
-
actinides
-
thorium
-
Th-232/Th-230 (1)
-
-
uranium
-
U-235 (1)
-
U-238 (2)
-
U-238/Pb-206 (1)
-
U-238/U-235 (1)
-
-
-
alkali metals
-
lithium (1)
-
potassium (3)
-
rubidium (1)
-
sodium (4)
-
-
alkaline earth metals
-
barium (2)
-
beryllium
-
Be-10 (4)
-
-
calcium
-
Sr/Ca (1)
-
-
magnesium (2)
-
strontium
-
Sr/Ca (1)
-
Sr-87/Sr-86 (24)
-
-
-
aluminum (3)
-
antimony (1)
-
arsenic (3)
-
bismuth (1)
-
cadmium (4)
-
chromium (4)
-
copper (7)
-
germanium (1)
-
gold (4)
-
hafnium
-
Hf-177/Hf-176 (5)
-
-
iron
-
ferric iron (4)
-
ferrous iron (1)
-
-
lead
-
Pb-206 (1)
-
Pb-206/Pb-204 (7)
-
Pb-207 (1)
-
Pb-207/Pb-204 (6)
-
Pb-207/Pb-206 (1)
-
Pb-208 (1)
-
Pb-208/Pb-204 (6)
-
Pb-210 (1)
-
U-238/Pb-206 (1)
-
-
manganese (2)
-
mercury (2)
-
molybdenum (2)
-
nickel (2)
-
niobium (2)
-
platinum group
-
iridium (1)
-
osmium (1)
-
platinum (2)
-
platinum ores (1)
-
-
precious metals (3)
-
rare earths
-
europium (1)
-
gadolinium (1)
-
lutetium (1)
-
neodymium
-
Nd-144/Nd-143 (10)
-
-
scandium (1)
-
-
silver (3)
-
titanium (4)
-
vanadium (2)
-
zinc (8)
-
-
nitrogen
-
N-15/N-14 (2)
-
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
helium
-
He-4/He-3 (1)
-
-
-
oxygen
-
O-17/O-16 (3)
-
O-18 (1)
-
O-18/O-16 (57)
-
-
phosphorus (3)
-
silicon (3)
-
sulfur
-
S-34/S-32 (21)
-
-
trace metals (4)
-
-
fossils
-
Archaea (1)
-
bacteria (4)
-
borings (2)
-
burrows (4)
-
Chordata
-
Vertebrata
-
Pisces
-
Chondrichthyes
-
Elasmobranchii (2)
-
-
Osteichthyes
-
Actinopterygii
-
Teleostei (1)
-
-
-
-
Tetrapoda
-
Amphibia (1)
-
Mammalia
-
Multituberculata (1)
-
Theria
-
Eutheria
-
Artiodactyla
-
Ruminantia
-
Bovidae
-
Bison (1)
-
-
-
-
Carnivora
-
Fissipeda
-
Canidae (1)
-
Felidae
-
Smilodon (1)
-
-
-
-
Cetacea (1)
-
Proboscidea
-
Elephantoidea
-
Elephantidae
-
Mammuthus
-
Mammuthus columbi (1)
-
-
-
-
-
Rodentia
-
Caviomorpha (1)
-
Hystricomorpha (1)
-
-
-
-
-
Reptilia
-
Anapsida
-
Testudines
-
Chelonia (2)
-
Cryptodira (2)
-
Testudinidae (1)
-
-
-
Diapsida
-
Archosauria
-
Crocodilia (2)
-
dinosaurs
-
Ornithischia
-
Ornithopoda
-
Hadrosauridae (2)
-
-
-
Saurischia
-
Theropoda
-
Coelurosauria
-
Dromaeosauridae (1)
-
-
-
-
-
Pterosauria (1)
-
-
Ichthyosauria (1)
-
-
Testudinata (1)
-
-
-
-
-
Cyclostomata (1)
-
eukaryotes (1)
-
fungi (3)
-
Graptolithina (3)
-
Hemichordata (2)
-
ichnofossils
-
Cruziana (1)
-
Palaeophycus (1)
-
Thalassinoides (1)
-
-
Invertebrata
-
Arthropoda
-
Chelicerata
-
Arachnida (1)
-
-
Mandibulata
-
Crustacea
-
Cirripedia (1)
-
Malacostraca
-
Amphipoda (1)
-
-
Ostracoda
-
Myodocopida (1)
-
Podocopida
-
Cytherocopina
-
Cytheracea
-
Cyprideis (1)
-
-
-
-
-
-
-
Trilobitomorpha
-
Trilobita
-
Ptychopariida
-
Olenidae (1)
-
-
-
-
-
Brachiopoda
-
Articulata
-
Strophomenida (1)
-
-
-
Bryozoa
-
Cheilostomata (2)
-
-
Cnidaria
-
Anthozoa
-
Zoantharia
-
Scleractinia (2)
-
-
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (1)
-
-
Echinozoa
-
Echinoidea (3)
-
-
-
Mollusca
-
Bivalvia
-
Glycymeris (1)
-
Heterodonta
-
Rudistae (4)
-
Veneroida
-
Lucinidae (1)
-
Veneridae (2)
-
-
-
Ostreoidea
-
Ostreidae (1)
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (2)
-
-
-
Gastropoda
-
Mesogastropoda
-
Cerithiidae (1)
-
-
Turritellidae
-
Turritella (1)
-
-
-
Polyplacophora (1)
-
Tentaculitida
-
Tentaculitidae
-
Tentaculites (1)
-
-
-
-
Porifera
-
Stromatoporoidea (1)
-
-
Protista
-
Foraminifera
-
Miliolina (1)
-
Rotaliina
-
Rotaliacea
-
Nummulitidae
-
Nummulites (1)
-
-
-
-
Textulariina
-
Lituolacea
-
Orbitolinidae
-
Orbitolina (1)
-
-
-
-
-
Radiolaria (4)
-
-
Vermes
-
Annelida (1)
-
Polychaeta (1)
-
-
-
Metazoa (1)
-
microfossils
-
Chitinozoa (1)
-
Conodonta (6)
-
problematic microfossils (2)
-
-
palynomorphs
-
acritarchs (7)
-
Chitinozoa (1)
-
Dinoflagellata (3)
-
miospores
-
pollen (3)
-
-
-
Plantae
-
algae
-
Chlorophyta (1)
-
Coccolithophoraceae
-
Emiliania
-
Emiliania huxleyi (1)
-
-
-
diatoms (4)
-
nannofossils (3)
-
Rhodophyta (2)
-
-
Pteridophyta (1)
-
Spermatophyta
-
Angiospermae
-
Monocotyledoneae (1)
-
-
-
-
problematic fossils
-
problematic microfossils (2)
-
-
Pterobranchia (2)
-
thallophytes (2)
-
trails (1)
-
-
geochronology methods
-
(U-Th)/He (5)
-
Ar/Ar (36)
-
exposure age (3)
-
fission-track dating (12)
-
infrared stimulated luminescence (1)
-
K/Ar (5)
-
Lu/Hf (5)
-
optically stimulated luminescence (3)
-
paleomagnetism (17)
-
Pb/Pb (1)
-
Rb/Sr (4)
-
Re/Os (5)
-
Sm/Nd (6)
-
tephrochronology (6)
-
Th/U (1)
-
thermochronology (12)
-
U/Pb (78)
-
uranium disequilibrium (2)
-
-
geologic age
-
Cenozoic
-
Agbada Formation (1)
-
lower Cenozoic (1)
-
middle Cenozoic (1)
-
Quaternary
-
Holocene
-
lower Holocene (1)
-
Middle Ages (2)
-
upper Holocene
-
Roman period (2)
-
-
-
Pleistocene
-
Bandelier Tuff (2)
-
Bishop Tuff (2)
-
Glasford Formation (1)
-
Illinoian (1)
-
lower Pleistocene
-
Calabrian (1)
-
-
middle Pleistocene (1)
-
upper Pleistocene
-
Weichselian
-
upper Weichselian
-
Younger Dryas (1)
-
-
-
Wisconsinan (2)
-
-
-
upper Quaternary (7)
-
-
Saugus Formation (1)
-
Sierra Ladrones Formation (1)
-
Tertiary
-
Asmari Formation (1)
-
Calipuy Group (1)
-
Catahoula Formation (1)
-
Lincoln Creek Formation (1)
-
lower Tertiary (1)
-
Neogene
-
Miocene
-
Fleming Formation (1)
-
lower Miocene
-
Burdigalian (1)
-
-
middle Miocene
-
Langhian (2)
-
Serravallian (1)
-
-
Oakville Sandstone (1)
-
Paintbrush Tuff (2)
-
Temblor Formation (1)
-
Tiva Canyon Member (1)
-
Topopah Spring Member (1)
-
upper Miocene
-
Messinian (2)
-
Modelo Formation (1)
-
Puente Formation (1)
-
Punchbowl Formation (1)
-
Santa Margarita Formation (1)
-
Tortonian (2)
-
-
-
Pliocene
-
Goliad Sand (1)
-
lower Pliocene
-
Zanclean (1)
-
-
upper Pliocene (4)
-
-
upper Neogene (1)
-
-
Paleogene
-
Calvert Bluff Formation (1)
-
Eocene
-
Annot Sandstone (1)
-
Crescent Formation (1)
-
Green River Formation (2)
-
Lake Uinta (1)
-
lower Eocene
-
Ypresian (1)
-
-
middle Eocene
-
Carrizo Sand (3)
-
Claiborne Group (2)
-
Cockfield Formation (1)
-
Yegua Formation (2)
-
-
Mirador Formation (1)
-
upper Eocene
-
Jackson Group (4)
-
Priabonian (2)
-
Whitsett Formation (1)
-
-
-
Oligocene
-
Frio Formation (4)
-
lower Oligocene
-
Rupelian (1)
-
-
middle Oligocene (4)
-
upper Oligocene (5)
-
Vicksburg Group (4)
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (2)
-
-
upper Paleocene (1)
-
-
Sespe Formation (1)
-
Wilcox Group (13)
-
-
Shahejie Formation (1)
-
Vaqueros Formation (1)
-
Zambales Ophiolite (1)
-
-
upper Cenozoic
-
Ituzaingo Formation (1)
-
-
-
Mesozoic
-
Bisbee Group (1)
-
Cretaceous
-
Alisitos Formation (1)
-
Comanchean
-
Buda Limestone (11)
-
Comanche Peak Limestone (1)
-
Edwards Formation (10)
-
Fredericksburg Group (4)
-
Georgetown Formation (3)
-
Glen Rose Formation (11)
-
Pearsall Formation (2)
-
Rodessa Formation (1)
-
Travis Peak Formation (1)
-
Trinity Group (5)
-
Washita Group (4)
-
-
Dakota Formation (1)
-
Logan Canyon Formation (1)
-
Lower Cretaceous
-
Albian
-
lower Albian (1)
-
upper Albian (3)
-
-
Aptian
-
lower Aptian (1)
-
Shuaiba Formation (4)
-
-
Barremian (2)
-
Candeias Formation (1)
-
Cedar Mountain Formation (2)
-
Comanche Peak Limestone (1)
-
Edwards Formation (10)
-
Fredericksburg Group (4)
-
Georgetown Formation (3)
-
Gething Formation (1)
-
Glen Rose Formation (11)
-
Hauterivian (1)
-
Hosston Formation (3)
-
Mannville Group (2)
-
McMurray Formation (9)
-
Missisauga Formation (1)
-
Mowry Shale (1)
-
Neocomian (2)
-
Pearsall Formation (2)
-
Rodessa Formation (1)
-
Sligo Formation (3)
-
Travis Peak Formation (1)
-
Trinity Group (5)
-
Urgonian (1)
-
Valanginian (2)
-
Wealden (1)
-
Yingcheng Formation (1)
-
-
Mancos Shale (3)
-
Middle Cretaceous (3)
-
Qingshankou Formation (2)
-
Queen Charlotte Group (1)
-
Upper Cretaceous
-
Almond Formation (1)
-
Buda Limestone (11)
-
Campanian
-
lower Campanian (1)
-
-
Castlegate Sandstone (1)
-
Cenomanian
-
Dunvegan Formation (1)
-
-
Codell Sandstone Member (1)
-
Coniacian (1)
-
Dawson Canyon Formation (1)
-
Eutaw Formation (1)
-
Ferron Sandstone Member (3)
-
Fruitland Formation (1)
-
Gulfian
-
Aguja Formation (1)
-
Austin Chalk (10)
-
Austin Group (9)
-
Eagle Ford Formation (32)
-
Olmos Formation (1)
-
Woodbine Formation (4)
-
-
Javelina Formation (3)
-
Judith River Formation (1)
-
K-T boundary (2)
-
La Luna Formation (4)
-
Lewis Shale (2)
-
Maestrichtian (8)
-
Mesaverde Group (2)
-
Moreno Formation (1)
-
Niobrara Formation (1)
-
Ojo Alamo Sandstone (1)
-
Point Loma Formation (1)
-
Rosario Formation (4)
-
Santonian (4)
-
Senonian (8)
-
Turonian
-
lower Turonian (1)
-
-
Tuscaloosa Formation (2)
-
Williams Fork Formation (1)
-
Wyandot Formation (1)
-
-
Whitemud Formation (1)
-
-
Franciscan Complex (2)
-
Great Valley Sequence (3)
-
Jurassic
-
Bazhenov Formation (2)
-
Carmel Formation (1)
-
Kingak Shale (1)
-
Lower Jurassic
-
Hettangian (2)
-
lower Liassic (1)
-
Nordegg Member (1)
-
Sinemurian (1)
-
Sunrise Formation (1)
-
Toarcian (3)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian (2)
-
Bathonian (1)
-
Callovian (1)
-
-
Norphlet Formation (3)
-
Posidonia Shale (1)
-
Upper Jurassic
-
Arab Formation (4)
-
Brushy Basin Member (1)
-
Buckner Formation (1)
-
Cotton Valley Group (1)
-
Hanifa Formation (1)
-
Haynesville Formation (1)
-
Kimmeridge Clay (2)
-
Kimmeridgian (2)
-
La Casita Formation (1)
-
Morrison Formation (2)
-
Oxfordian (3)
-
Portlandian (2)
-
Schuler Formation (1)
-
Smackover Formation (3)
-
Tithonian (5)
-
-
-
McHugh Complex (1)
-
middle Mesozoic (1)
-
Moenave Formation (1)
-
Navajo Sandstone (1)
-
Nugget Sandstone (1)
-
Pucara Group (1)
-
Statfjord Formation (1)
-
Triassic
-
Lower Triassic
-
Bunter (1)
-
Olenekian (1)
-
Permian-Triassic boundary (2)
-
Smithian (1)
-
-
Middle Triassic
-
Doig Formation (3)
-
Ladinian (2)
-
-
Moenkopi Formation (1)
-
Montney Formation (9)
-
Sherwood Sandstone (2)
-
Shublik Formation (1)
-
Upper Triassic
-
Carnian
-
Ischigualasto Formation (1)
-
-
Chinle Formation (1)
-
Dockum Group (1)
-
Keuper (1)
-
Xujiahe Formation (2)
-
Yanchang Formation (4)
-
-
-
upper Mesozoic (1)
-
Vaca Muerta Formation (7)
-
Yanshanian (1)
-
-
MIS 3 (1)
-
MIS 5 (1)
-
Paleozoic
-
Berea Sandstone (1)
-
Cambrian
-
Lower Cambrian
-
Zabriskie Quartzite (1)
-
-
Middle Cambrian (1)
-
Upper Cambrian
-
Furongian (1)
-
Potsdam Sandstone (1)
-
-
-
Carboniferous
-
Albert Formation (1)
-
Bartlesville Sand (1)
-
Huanglong Formation (1)
-
Lower Carboniferous
-
Dinantian (3)
-
-
Mississippian
-
Barnett Shale (7)
-
Charles Formation (1)
-
Lower Mississippian
-
Kekiktuk Conglomerate (1)
-
Lodgepole Formation (2)
-
Tournaisian (2)
-
-
Madison Group (3)
-
Middle Mississippian
-
Visean
-
upper Visean (1)
-
-
-
Mission Canyon Limestone (1)
-
Sunbury Shale (1)
-
Upper Mississippian
-
Fayetteville Formation (1)
-
Heath Formation (1)
-
Serpukhovian (1)
-
-
-
Pennsylvanian
-
Lower Pennsylvanian
-
Bashkirian (1)
-
-
Middle Pennsylvanian
-
Atokan
-
Atoka Formation (1)
-
-
Carbondale Formation (1)
-
-
Upper Pennsylvanian
-
Missourian
-
Seminole Formation (1)
-
-
-
-
Upper Carboniferous
-
Stephanian (1)
-
-
-
Chattanooga Shale (1)
-
Devonian
-
Keg River Formation (1)
-
Lower Devonian (3)
-
Middle Devonian
-
Givetian (1)
-
Marcellus Shale (8)
-
Prairie Evaporite (2)
-
-
Slave Point Formation (1)
-
Swan Hills Formation (1)
-
Thirtyone Formation (2)
-
Upper Devonian
-
Famennian
-
upper Famennian (1)
-
-
Frasnian (1)
-
Ohio Shale (1)
-
-
-
Hunton Group (1)
-
Itarare Subgroup (1)
-
lower Paleozoic
-
Conococheague Formation (1)
-
-
New Albany Shale (1)
-
Ordovician
-
Eureka Quartzite (1)
-
Lower Ordovician
-
Ellenburger Group (6)
-
Floian (1)
-
Prairie du Chien Group (1)
-
Saint George Group (1)
-
Tremadocian (1)
-
-
Majiagou Formation (2)
-
Middle Ordovician
-
Saint Peter Sandstone (1)
-
Simpson Group (1)
-
-
Montoya Group (1)
-
Upper Ordovician
-
Caradocian (1)
-
Katian (1)
-
Sandbian (1)
-
Wufeng Formation (4)
-
-
Utica Shale (1)
-
-
Permian
-
Ecca Group (2)
-
Guadalupian
-
Capitan Formation (1)
-
Grayburg Formation (2)
-
-
Kaibab Formation (1)
-
Khuff Formation (2)
-
Longtan Formation (1)
-
Lower Permian
-
Abo Formation (1)
-
Cisuralian (2)
-
Leonardian
-
Bone Spring Limestone (3)
-
-
Qixia Formation (1)
-
Wolfcampian
-
Hueco Limestone (1)
-
-
-
Maokou Formation (2)
-
Middle Permian (2)
-
Rotliegendes (1)
-
Shihezi Formation (1)
-
Unayzah Formation (1)
-
Upper Permian
-
Lopingian
-
Changhsingian (1)
-
-
Permian-Triassic boundary (2)
-
Salado Formation (1)
-
Zechstein (1)
-
-
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Silurian
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Primary terms
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Middle Jurassic
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Norphlet Formation (3)
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Upper Jurassic
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Arab Formation (4)
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McHugh Complex (1)
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Statfjord Formation (1)
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Triassic
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Lower Triassic
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Bunter (1)
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Smithian (1)
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Middle Triassic
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Doig Formation (3)
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Moenkopi Formation (1)
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Montney Formation (9)
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Sherwood Sandstone (2)
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Shublik Formation (1)
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Upper Triassic
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Carnian
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Ischigualasto Formation (1)
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Chinle Formation (1)
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Dockum Group (1)
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Keuper (1)
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Xujiahe Formation (2)
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Yanchang Formation (4)
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upper Mesozoic (1)
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Vaca Muerta Formation (7)
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Mexico
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North America
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Paleozoic
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Carboniferous
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Lower Carboniferous
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Mississippian
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Lower Mississippian
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Tournaisian (2)
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Visean
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upper Visean (1)
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Mission Canyon Limestone (1)
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Upper Mississippian
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Fayetteville Formation (1)
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Serpukhovian (1)
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Pennsylvanian
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Lower Pennsylvanian
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Middle Pennsylvanian
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Atokan
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Atoka Formation (1)
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Carbondale Formation (1)
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Upper Pennsylvanian
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Missourian
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Seminole Formation (1)
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Upper Carboniferous
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Stephanian (1)
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Chattanooga Shale (1)
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Devonian
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Keg River Formation (1)
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Prairie Evaporite (2)
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Slave Point Formation (1)
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Upper Devonian
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upper Famennian (1)
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Frasnian (1)
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Ohio Shale (1)
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-
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Hunton Group (1)
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Itarare Subgroup (1)
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lower Paleozoic
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Conococheague Formation (1)
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New Albany Shale (1)
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Ordovician
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Upper Ordovician
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Wufeng Formation (4)
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Utica Shale (1)
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Permian
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Kaibab Formation (1)
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Lower Permian
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Qixia Formation (1)
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Wolfcampian
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Maokou Formation (2)
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Upper Permian
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Lopingian
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Permian-Triassic boundary (2)
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Salado Formation (1)
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Zechstein (1)
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Silurian
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Lower Silurian
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Tuscarora Formation (1)
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Upper Silurian
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Ludlow
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Ludfordian (1)
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Taiyuan Formation (1)
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Tensleep Sandstone (1)
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Tippecanoe Sequence (1)
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upper Paleozoic
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Bakken Formation (4)
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Woodford Shale (6)
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plate tectonics (103)
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Precambrian
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Stirling Quartzite (1)
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Paleoproterozoic
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problematic fossils
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
San Antonio Formation
LATE CRETACEOUS FORAMINIFERA, PALEOENVIRONMENTS, AND PALEOCEANOGRAPHY OF THE ROSARIO FORMATION, SAN ANTONIO DEL MAR, BAJA CALIFORNIA, MEXICO Available to Purchase
TABLE 2. 40 Ar/ 39 Ar AGES FOR THE SAN ANTONIO FORMATION, SOUTHERN MMVB Available to Purchase
ENGINEERING GEOLOGY OF SAN FRANCISCO BAY, CALIFORNIA Available to Purchase
Cretaceous through Eocene Sedimentation and Paleogeography of a Passive Margin in Northeastern Venezuela Available to Purchase
Abstract Approximately 5 km of Cretaceous and Paleogene strata are exposed in the Serranfa del Lnlerior of northeastern Venezuela, and the depositional settings and paleoenvironmental conditions of these strata have been investigated, leading to paleogeographic reconstructions spanning approximately 90 my of passive-margin sedimentation. Exposed Lower Cretaceous strata are generally shallow marine in origin and vary between siljciclasUc shelf deposits and bioherm-dominated, impure carbonate platform deposits. Neocomian-Aptian shelfal and carbonate-platform facies are widespread and comprise the Barranqufn Formation. A major, Early Cretaceous siliciclasiic fiuvio-deltaic system emanated from southwest of the Serranfa del Interior and was the source of the commonly coarse-grained Lower Cretaceous strata. In Early Albian time, a short-lived transgressive/regressive cycle led to deposition of the shaley, deep-shelf deposits of the Garcfa Formation. The E) Cantil Formation was deposited on a Early to early Middle Albian carbonate platform that had significant and variable silicjclaslic contamination (particularly in the southern Serranfa del Interior). The carbonate platform started retrograding southward in Early Albian time and was eventually succeeded by deeper marine deposition of glauconitic sand and shale of the Cbimana Formation. After a brief, Middle Albian progradational event (upper Chimana Formation), regional transgression led to primarily pelagic deposition in the Querecual Formation. Upper Cretaceous strata are notably more homogeneous and of deeper marine origin than Lower Cretaceous strata, and consist primarily of organic-rich, calcareous siltstone and muddy, micritic limestone. These slope deposits of the Querecual and San Antonio Formations are the petroleum source rocks for the Eastern Venezuela Basin. Deep-water (>200 m) sedimentation continued almost continuously from Late Albian until mid-Maastrichtian time, with (he exception of a minor, Santonian- Early Campanian influx of sand at the base of the San Antonio Formation. A voluminous influx of submarine fan sediments occurred in Late Maastrichtian time during deposition of the San Juan Formation. After transgression and monotonous dark shale deposition in the Vidono Formation, renewed progradation in Early Eocene time led to deposition of the glauconitic submarine fan deposits of the Caratas Formation. Shallowing of the depositional surface locally led to shelfal carbonate deposition at the top of the Caratas Formation in Middle Eocene time (the Tinajitas limestone). Passive-margin sedimentation was finished by the close of the Eocene Epoch, and was followed by foredeep sedimentation and eventually by uplift and exposure of the passive-margin strata within the Serranfa del Interior.
Stratigraphy of Northeastern Anzoátegui, Venezuela Available to Purchase
The Yerba Buena mud: Record of the last-interglacial predecessor of San Francisco Bay, California Available to Purchase
Sedimentary Structures of the La Luna, Navay and Querecual Formations, Upper Cretaceous of Venezuela Available to Purchase
Preliminary Rb–Sr geochronology of the Rice Lake – Beresford Lake area, southeastern Manitoba Free
1981 Student Professional Paper: Engineering Geologic Feasibility of Lignite Mining in Alluvial Valleys by Hydraulic Dredging Methods Available to Purchase
Synthesized stratigraphic column of the San Antonio de los Cobres Formation... Available to Purchase
FIGURE 1 —Outcrop map of the Puncoviscana Formation in the San Antonio de l... Available to Purchase
FIGURE 2 —Trace fossils of the Puncoviscana Formation in the San Antonio de... Available to Purchase
Map showing outcrop of Whitsett Formation from San Antonio River near Falls... Available to Purchase
Cumulative probability plots showing SHRIMP ages on detrital zircons from s... Available to Purchase
Figure 4. Composite stratigraphic column of the Upper Cretaceous to Cenozoi... Available to Purchase
San Antonio Pool of the Edwards (Balcones Fault Zone) Aquifer Open Access
ABSTRACT The Edwards (Balcones Fault Zone) Aquifer in central Texas is typically defined as having three segments: the San Antonio, the Barton Springs, and the Northern segment, which are separated by groundwater divides or points of discharge. The San Antonio segment of the Edwards Aquifer is defined as extending from east of Brackettville in the west to Hays County in the east. The San Antonio segment has been further delineated into two pools, the San Antonio Pool and the Uvalde Pool, for water management purposes. The San Antonio Pool is the larger of the two pools and is recharged by the Dry Frio, Frio, Sabinal, Medina, Cibolo, Guadalupe, and Blanco River watersheds, in addition to direct recharge and flow from the Uvalde Pool via the Knippa Gap. To a lesser extent, interformational flow between units stratigraphically above and below the Edwards Formation limestone also occurs. The most prominent points of discharge from the San Antonio Pool are Comal, San Marcos, and Hueco Springs. San Pedro and San Antonio Springs in Bexar County discharge during periods of high stage in the aquifer. There are limited numbers of additional springs in the Frio River watershed with limited discharge. Significant water is discharged from the Medina Lake and Diversion Lake (downstream from Medina Lake dam) system via conduits and surface flow to recharge paleo-alluvial deposits (Leona Gravel) in the Medina River floodplain. This discharge had previously been assumed to recharge the Edwards Aquifer, but it continues downgradient in the Leona Gravel and is lost to the aquifer.
Zonation of hydrothermal alteration at the San Antonio gold mine, Bissett, Manitoba, Canada Available to Purchase
Biological zonation on a rocky-shore boulder deposit; upper Pleistocene Bahia San Antonio (Baja California Sur, Mexico) Available to Purchase
The Anacacho Limestone of southwest Texas Available to Purchase
Abstract The Anacacho Limestone represents an anomaly in the Gulfian-age rocks of Texas. Like the Austin Chalk that it unconformably overlies, the Anacacho is a limestone in a section dominated by terrigenous elastics and mudrocks; unlike the Austin Chalk (which is extensive throughout the margin of the Gulf Basin), the Anacacho is a small carbonate bank that extends less than 96 mi (160 km) along an east-west trend on the flanks of the Uvalde Salient. The formation thins perceptibly to the east toward San Antonio, where it is replaced by rocks of the Taylor Group. The formation reaches its maximum thickness on the flanks of the Uvalde Salient, and terminates abruptly at the western edge of the Anacacho Mountains. West of this termination the Anacacho is replaced by the Upson and San Miguel Formations. From the Nueces River, west of the Uvalde Salient, westward to the Anacacho Mountains, the limestone outcrop is continuous for approximately 28 mi (46 km). The width of the outcrop varies from 2.4 mi (4 km) to 9 mi (15 km). East of the Uvalde Salient, outcrops of the Anacacho Limestone are discontinuous and scattered. Much of the section is either covered by alluvium or is lost along faults of the Balcones Fault Zone (Bureau of Economic Geology, 1974). This section, from Blanco Creek eastward to San Antonio, is approximately 60 mi (100 km) in length. However, outcrops in this section are limited in length from a few miles to several hundred feet. Exposures are mostly along
Geological evolution of the Tacaná Volcanic Complex, México-Guatemala Available to Purchase
The Tacaná Volcanic Complex represents the northernmost active volcano of the Central American Volcanic Arc. The genesis of this volcanic chain is related to the subduction of the Cocos plate beneath the Caribbean plate. The Tacaná Volcanic Complex is influenced by an important tectonic structure as it lies south of the active left-lateral strike-slip Motozintla fault related to the Motagua-Polochic fault zone. The geological evolution of the Tacaná Volcanic Complex and surrounding areas is grouped into six major sequences dating from the Mesozoic to Recent. The oldest basement rocks are Mesozoic schists and gneisses of low-grade metamorphism. These rocks are intruded by Tertiary granites, granodiorites, and tonalites ranging in age from 12 to 39 Ma, apparently separated by a gap of 9 m.y. The first intrusive phase occurred during late Eocene to early Oligocene, and the second during early to middle Miocene. These rocks are overlain by deposits from the Calderas San Rafael (ca. 2 Ma), Chanjale (ca. 1 Ma), and Sibinal (unknown age), grouped under the name Chanjale–San Rafael Sequence, of late Pliocene–Pleistocene age. The activity of these calderas produced thick block-and-ash flows, ignimbrites, lavas, and debris flows. The Tacaná Volcanic Complex began its formation during the late Pleistocene, nested in the preexisting San Rafael Caldera. The Tacaná Volcanic Complex formed through the emplacement of four volcanic centers. The first, Chichuj volcano, was formed by andesitic lava flows and pyroclastic deposits, after which it was destroyed by the collapse of the edifice. The second, Tacaná volcano, formed through the emission of basaltic-andesite lava flows, as well as andesitic and dacitic domes that produced extensive block-and-ash flows ∼38,000, 28,000, and 16,000 yr B.P. The Plan de las Ardillas structure (the third volcanic center) consists of an andesitic dome with two lava flows emplaced on the high slope of the Tacaná ∼30,000 yr B.P. Finally, the San Antonio volcanic center was built through the emission of lava flows, andesitic and dacitic domes, and it was destroyed by a Peléan eruption at 1950 yr B.P. that produced a block-and-ash flow deposit. The Tacaná Volcanic Complex was emplaced along a NE-SW trend beginning with Chichuj, followed by Tacaná, Las Ardillas, and San Antonio. This direction is roughly the same as the NE-SW Tacaná graben (as proposed in this work), together with other faults and fractures exposed in the region. The rocks of the Chanjale-San Rafael Sequence and the Tacaná Volcanic Complex have a calc-alkaline signature with medium K contents, negative anomalies of Nb, Ti, and P, and enrichment in light rare earth elements, typical of subduction zones.