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all geography including DSDP/ODP Sites and Legs
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Africa
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Cape Verde Islands (1)
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Central Africa
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Angola (2)
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East Africa
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Zambia (1)
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East African Rift (1)
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North Africa
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Atlas Mountains
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Egypt
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Morocco
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Southern Africa
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South Africa
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Far East
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chemical ratios (3)
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Cl-36 (1)
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hydrogen
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isotope ratios (30)
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isotopes
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Be-10 (4)
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Pb-207/Pb-204 (2)
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stable isotopes
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C-13/C-12 (20)
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D/H (4)
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N-15/N-14 (1)
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Nd-144/Nd-143 (2)
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O-18/O-16 (19)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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S-34/S-32 (3)
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Sr-87/Sr-86 (9)
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metals
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Sr-87/Sr-86 (9)
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antimony (1)
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lead
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Pb-206/Pb-204 (2)
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Pb-208/Pb-204 (2)
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rare earths
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Nd-144/Nd-143 (2)
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titanium (1)
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nitrogen
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oxygen
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O-18/O-16 (19)
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S-34/S-32 (3)
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Chordata
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Tetrapoda
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Labyrinthodontia
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Aves (2)
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Mammalia
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Insectivora (1)
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Rodentia
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Reptilia
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Testudines
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Diapsida
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Archosauria
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dinosaurs (3)
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Synapsida
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Therapsida
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Dicynodontia
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Lystrosaurus (1)
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-
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ichnofossils (10)
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Invertebrata
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Arthropoda
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Chelicerata
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Mandibulata
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Crustacea
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Ostracoda (10)
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-
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Brachiopoda
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Articulata
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Rhynchonellida (1)
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Echinodermata
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Crinozoa
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Crinoidea (1)
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Echinozoa
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Mollusca
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Bivalvia
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Veneroida
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Mactra (1)
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Pterioida
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Pectinacea
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Cephalopoda
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Ammonoidea (1)
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Gastropoda
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Naticidae (1)
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Neogastropoda
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Muricidae (1)
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Turritellidae
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Turritella (1)
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-
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Protista
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Foraminifera (6)
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microfossils
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Charophyta (1)
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Conodonta (1)
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Dinoflagellata (1)
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Plantae
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algae
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Chlorophyta
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Charophyta (1)
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diatoms (3)
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Pteridophyta
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Filicopsida (1)
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Lycopsida (1)
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Sphenopsida
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Equisetales
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Calamites (1)
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Spermatophyta
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Angiospermae (1)
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Cordaitales (1)
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problematic fossils
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problematic microfossils (1)
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tracks (5)
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geochronology methods
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(U-Th)/He (7)
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Ar/Ar (12)
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exposure age (5)
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fission-track dating (3)
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infrared stimulated luminescence (1)
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optically stimulated luminescence (6)
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uranium disequilibrium (4)
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geologic age
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Cenozoic
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lower Cenozoic (1)
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Quaternary
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Cordilleran ice sheet (1)
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Holocene
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Medieval Warm Period (1)
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Neoglacial (1)
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upper Holocene (8)
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Pleistocene
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Bishop Tuff (2)
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Blackwater Draw Formation (3)
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Irvingtonian (1)
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Lake Missoula (2)
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lower Pleistocene
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Calabrian (1)
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Gelasian (1)
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Olduvai Subchron (1)
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middle Pleistocene (3)
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upper Pleistocene
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Rancholabrean (1)
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-
-
upper Quaternary (5)
-
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Sierra Ladrones Formation (1)
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Tertiary
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Muddy Creek Formation (2)
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Neogene
-
Bidahochi Formation (4)
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Miocene
-
Barstow Formation (1)
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Columbia River Basalt Group (2)
-
lower Miocene
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Burdigalian (1)
-
-
middle Miocene (3)
-
upper Miocene
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Messinian (2)
-
-
-
Ogallala Formation (1)
-
Pliocene
-
lower Pliocene (8)
-
upper Pliocene (2)
-
-
-
Paleogene
-
Claron Formation (1)
-
Duchesne River Formation (1)
-
Eocene
-
Bridger Formation (2)
-
Bridgerian (2)
-
Colton Formation (2)
-
Green River Formation (5)
-
lower Eocene
-
Wasatchian (1)
-
Ypresian (1)
-
-
middle Eocene (2)
-
Subathu Formation (1)
-
upper Eocene
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Uinta Formation (2)
-
-
-
Oligocene
-
upper Oligocene (1)
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (1)
-
-
-
Sespe Formation (1)
-
Wasatch Formation (3)
-
-
-
upper Cenozoic (2)
-
-
Lake Bonneville (1)
-
Mesozoic
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Cretaceous
-
Comanchean
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Fredericksburg Group (1)
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Trinity Group (1)
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Washita Group (1)
-
-
Lower Cretaceous
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Albian (2)
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Aptian (3)
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Berriasian (1)
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Fredericksburg Group (1)
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Trinity Group (1)
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Valanginian (1)
-
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Upper Cretaceous
-
Campanian (2)
-
Kaiparowits Formation (1)
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Maestrichtian (1)
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Selma Group (1)
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Senonian (1)
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Two Medicine Formation (1)
-
-
-
Glen Canyon Group (2)
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Jurassic
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Aztec Sandstone (1)
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Carmel Formation (1)
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Lower Jurassic
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middle Liassic (1)
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Pliensbachian (2)
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Toarcian (1)
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Middle Jurassic
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Page Sandstone (1)
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San Rafael Group (1)
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Upper Jurassic
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Brushy Basin Member (1)
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Buckner Formation (1)
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Entrada Sandstone (2)
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Kimmeridgian
-
upper Kimmeridgian (1)
-
-
Morrison Formation (7)
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Salt Wash Sandstone Member (1)
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Sarayaquillo Formation (1)
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Smackover Formation (1)
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Sundance Formation (1)
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Tithonian (1)
-
-
-
Kayenta Formation (1)
-
middle Mesozoic (1)
-
Navajo Sandstone (5)
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Newark Supergroup (2)
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Nicoya Complex (1)
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Nugget Sandstone (1)
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Pucara Group (1)
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Triassic
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Chanares Formation (1)
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Lower Triassic
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Bunter (1)
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Permian-Triassic boundary (1)
-
-
Middle Triassic
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Anisian (3)
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Ladinian (1)
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Muschelkalk (1)
-
-
Moenkopi Formation (2)
-
Red Peak Formation (1)
-
Upper Triassic
-
Carnian (4)
-
Chinle Formation (3)
-
Mercia Mudstone (1)
-
Norian (4)
-
Petrified Forest Member (1)
-
Rhaetian (2)
-
Shinarump Member (1)
-
-
-
upper Mesozoic (1)
-
Vaca Muerta Formation (2)
-
-
Paleozoic
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Acatlan Complex (1)
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Cambrian
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Lower Cambrian
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Zabriskie Quartzite (1)
-
-
Middle Cambrian
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Bright Angel Shale (1)
-
-
Tapeats Sandstone (1)
-
-
Carboniferous
-
Albert Formation (1)
-
Lower Carboniferous
-
Dinantian (1)
-
-
Mabou Group (2)
-
Mississippian
-
Charles Formation (1)
-
Lower Mississippian
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Osagian (1)
-
Tournaisian
-
upper Tournaisian (1)
-
-
-
Madison Group (1)
-
Redwall Limestone (1)
-
Upper Mississippian
-
Serpukhovian (1)
-
-
Windsor Group (1)
-
-
Pennsylvanian
-
Cumberland Group (2)
-
Joggins Formation (1)
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Lower Pennsylvanian (1)
-
Middle Pennsylvanian (1)
-
Upper Pennsylvanian (1)
-
-
Upper Carboniferous
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Stephanian (1)
-
-
-
Devonian
-
Lower Devonian (1)
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Middle Devonian
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Eifelian (1)
-
-
Muth Quartzite (1)
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Old Red Sandstone (1)
-
Upper Devonian
-
Famennian
-
upper Famennian (1)
-
Wabamun Group (1)
-
-
Jefferson Group (1)
-
Palliser Formation (1)
-
-
-
Horton Group (1)
-
Ordovician
-
Upper Ordovician (1)
-
-
Permian
-
Guadalupian
-
Grayburg Formation (1)
-
Queen Formation (1)
-
Seven Rivers Formation (1)
-
Tansill Formation (1)
-
-
Irati Formation (1)
-
Khuff Formation (1)
-
Lower Permian
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Leonardian (1)
-
-
Middle Permian (1)
-
Rotliegendes (1)
-
Toroweap Formation (1)
-
Unayzah Formation (1)
-
Upper Permian
-
Lopingian (1)
-
Permian-Triassic boundary (1)
-
Zechstein (3)
-
-
Yates Formation (1)
-
-
Ringerike Sandstone (1)
-
Silurian
-
Upper Silurian (1)
-
-
upper Paleozoic (5)
-
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Phanerozoic (1)
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Precambrian
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Animikie Group (1)
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Archean
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Neoarchean (1)
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Paleoarchean (1)
-
-
Johnnie Formation (1)
-
Kingston Peak Formation (1)
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Noonday Dolomite (2)
-
Stirling Quartzite (1)
-
upper Precambrian
-
Proterozoic
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Keweenawan (1)
-
Mesoproterozoic
-
Apache Group (1)
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Belt Supergroup (1)
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Helena Formation (1)
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Missoula Group (1)
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Ravalli Group (1)
-
-
Neoproterozoic
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Ediacaran (2)
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Vendian (1)
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Paleoproterozoic (1)
-
-
-
-
-
igneous rocks
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igneous rocks
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carbonatites (2)
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plutonic rocks
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diabase (5)
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diorites
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plagiogranite (1)
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gabbros
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olivine gabbro (1)
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granites (3)
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pegmatite (1)
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syenites (1)
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ultramafics
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peridotites (2)
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-
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volcanic rocks
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basalts
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flood basalts (1)
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pyroclastics
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ash-flow tuff (1)
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ignimbrite (2)
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pumice (1)
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tuff (6)
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welded tuff (1)
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rhyolites (1)
-
-
-
-
metamorphic rocks
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metamorphic rocks
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gneisses
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orthogneiss (1)
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jadeitite (2)
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metaigneous rocks
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serpentinite (2)
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metasomatic rocks
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serpentinite (2)
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quartzites (1)
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schists
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blueschist (1)
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glaucophane schist (1)
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turbidite (1)
-
-
meteorites
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meteorites
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stony meteorites
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achondrites
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Martian meteorites
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SNC Meteorites
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nakhlite
-
Nakhla Meteorite (1)
-
-
-
-
-
-
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minerals
-
arsenates (1)
-
borates
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colemanite (2)
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hydroboracite (2)
-
ulexite (1)
-
-
carbonates
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calcite (6)
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dolomite (3)
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hydromagnesite (1)
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magnesite (1)
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siderite (1)
-
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halides
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chlorides
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halite (5)
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fluorides
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fluorite (1)
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-
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nitrates (1)
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oxides
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baddeleyite (1)
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goethite (1)
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hematite (1)
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iron oxides (1)
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manganese oxides (1)
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rutile (1)
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phosphates
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apatite (7)
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silicates
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asbestos (1)
-
chain silicates
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amphibole group
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clinoamphibole
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glaucophane (1)
-
-
-
charoite (1)
-
pyroxene group
-
clinopyroxene
-
jadeite (2)
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omphacite (1)
-
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (1)
-
sanidine (2)
-
-
plagioclase
-
albite (1)
-
-
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silica minerals
-
opal (1)
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quartz (2)
-
-
zeolite group (2)
-
-
orthosilicates
-
nesosilicates
-
garnet group (1)
-
olivine group
-
olivine (1)
-
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (22)
-
-
-
sorosilicates
-
lawsonite (1)
-
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
clay minerals
-
halloysite (1)
-
smectite (1)
-
-
illite (1)
-
mica group
-
muscovite (1)
-
paragonite (1)
-
-
palygorskite (1)
-
sepiolite (1)
-
-
-
sulfates
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anhydrite (4)
-
bassanite (1)
-
glauberite (1)
-
gypsum (6)
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jarosite (1)
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mirabilite (1)
-
-
sulfides
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orpiment (1)
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realgar (1)
-
-
vanadates
-
carnotite (1)
-
-
-
Primary terms
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absolute age (52)
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academic institutions (1)
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Africa
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Cape Verde Islands (1)
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Central Africa
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Angola (2)
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East Africa
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Kenya (1)
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East African Rift (1)
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North Africa
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Atlas Mountains
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Moroccan Atlas Mountains
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Egypt
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Aswan Egypt
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Eastern Desert (1)
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Morocco
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Tunisia (1)
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Southern Africa
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Botswana (1)
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Kaapvaal Craton (1)
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Karoo Basin (2)
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Namibia (6)
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South Africa
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Eastern Cape Province South Africa (1)
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Western Cape Province South Africa (1)
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Antarctica (1)
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Asia
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Arabian Peninsula
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Qatar (1)
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Saudi Arabia
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Ghawar Field (1)
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-
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Central Asia (1)
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Chukotka Russian Federation
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Lake El'gygytgyn (1)
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Far East
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China
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Altyn Tagh Fault (1)
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Japan
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Novosibirsk Russian Federation (1)
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Yakutia Russian Federation (1)
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associations (1)
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Atlantic Ocean
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North Atlantic
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South Atlantic
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Atlantic Ocean Islands
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Cape Verde Islands (1)
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atmosphere (1)
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Mesozoic
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Upper Cretaceous
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Jurassic
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Morrison Formation (7)
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Kayenta Formation (1)
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Triassic
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Middle Triassic
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Paleozoic
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Upper Carboniferous
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Palliser Formation (1)
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Horton Group (1)
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Ordovician
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Permian
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Guadalupian
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Grayburg Formation (1)
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Irati Formation (1)
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Khuff Formation (1)
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Lower Permian
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Rotliegendes (1)
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Toroweap Formation (1)
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Unayzah Formation (1)
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Upper Permian
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Lopingian (1)
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Permian-Triassic boundary (1)
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Zechstein (3)
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Yates Formation (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Playa Grande
Petrography, mineralogy and geochemistry of jadeite-rich artefacts from the Playa Grande excavation site, northern Hispaniola: evaluation of local provenance from the Río San Juan Complex Available to Purchase
Abstract Many archaeological sites with jadeitite artefacts are known in the Caribbean region, but defining the source of the raw material is a major problem because of great mineralogical heterogeneity both in potential sources and in artefacts. The archaeological settlement site of Playa Grande on the northern coast of the Dominican Republic is particularly significant because it yielded evidence of on-site axe manufacture, and lies only 20–30 km NE of a recently discovered potential source area of serpentinite mélanges in the nearby Río San Juan Complex (RSJC). A suite of nine artefacts was chosen from a collection of over 100 excavated woodworking tools rich in jadeite, as well as two blueschist artefacts. Permission to perform destructive analysis allowed data on petrography, mineral chemistry and bulk-rock chemistry to be obtained. Seven of the nine artefacts are jadeitite sensu stricto (>90 vol% jadeite), which are identical to material known from the RSJC. Two artefacts are jadeite–lawsonite rocks. These and the two blueschists show only minor differences from corresponding rocks of the RSJC source. With this direct linking of source and site material, it is now possible to better define source discriminators for the Caribbean and to assess sampling bias.
Reconstructing relative flooding intensities responsible for hurricane-induced deposits from Laguna Playa Grande, Vieques, Puerto Rico Available to Purchase
A: Site map of Laguna Playa Grande (LPG), Vieques, Puerto Rico (18.09°N, 65... Available to Purchase
Regional chronology of overwash deposits, generally organized from southwes... Available to Purchase
FOOTFALL PATTERN OF A BOTTOM-WALKING CROCODILE ( CROCODYLUS ACUTUS ) Available to Purchase
Shaded bathymetry map of the Virgin Islands basin and the Virgin Islands pl... Available to Purchase
Comparison of tropical cyclone reconstructions with other paleoclimatic pro... Available to Purchase
Paleogeographic implications of late Miocene lacustrine and nonmarine evaporite deposits in the Lake Mead region: Immediate precursors to the Colorado River Open Access
Evidence of similar probablility of intense hurricane strikes for the Gulf of Mexico over the late Holocene Available to Purchase
Rejection of the lake spillover model for initial incision of the Grand Canyon, and discussion of alternatives Open Access
Facies and interpreted sequence stratigraphy of the Pika and Arctomys–Water... Available to Purchase
Pliocene–Holocene deformation in the southern Rio Grande rift as inferred from topography and uplifted terraces of the Franklin Mountains, southern New Mexico and western Texas Open Access
Tectonic development of Upper Cretaceous to Eocene strata of southwestern Utah Available to Purchase
TERTIARY AND QUATERNARY GEOLOGY OF THE LOWER RIO PUERCO AREA, NEW MEXICO Available to Purchase
Major elements of evolving late Miocene drainage networks in Lake Mead regi... Open Access
Stratigraphic consequences of episodic extension in the Lemitar Mountains, central Rio Grande rift Available to Purchase
Detailed stratal tilt information for radioisotopically dated Tertiary rocks in the Lemitar Mountains of the central Rio Grande rift allows discrimination of two episodes of extension in the late Oligocene (largely 28.6 to 27.4 Ma) and middle to late Miocene (16 to 10 Ma). Rapid deformation in the late Oligocene (at least 25% extension) produced narrow, wedge-shaped accumulations of ash-flow tuffs and mafic lavas within half grabens defined by closely spaced (2 to 5 km) planar-rotational normal faults. Volcanic accumulation rates during this episode were sufficient to bury the developing fault-block topography, resulting in preservation of only minor amounts of intercalated sedimentary rocks. Following a period of weak extension in the early Miocene, rates of extensional strain again began to increase in the early middle Miocene (about 16 Ma) and continued to increase until about 10 Ma, when a more moderate rate ensued. During the time interval of 16 to 10 Ma, the Lemitar Mountains area was extended about 30% along widely spaced (5 to 15 km) planar-normal faults. Increased stratal-tilt rates in the middle Miocene caused the development of accommodation space to locally exceed sediment supply on the down-thrown side of a major intrabasinal fault (Silver Creek fault), resulting in topographic closure and the development of playa deposits within the lower Santa Fe Group (Popotosa Formation). As stratal-tilt rates further increased in the late Miocene, fluvial-lacustrine sedimentation offlapped toward narrow zones of maximum subsidence along active faults, causing the carving of widespread unconformities on older sediments on hanging-wall dip slopes. As tectonism waned in the latest Miocene-early Pliocene, sediment supply exceeded the development of accommodation space, resulting in onlap and aggradation of the upper Santa Fe Group (Sierra Ladrones Formation) that enabled the eventual integration of an axial-fluvial system (ancestral Rio Grande) between the longitudinally arrayed half grabens to the north and south of the Socorro Basin. The late Oligocene episode of rapid extension appears to be related to strain focusing by local thermal weakening due to voluminous concurrent magmatism in the area. In contrast, the late Miocene extensional event may be of regional scale, as shown by evidence for contemporaneous tectonism in other areas and the development of widespread unconformities between Miocene and Pliocene deposits of the Santa Fe Group in many basins of the Rio Grande rift.
Pedal stride length versus animal size. A ) Comparison of stride lengths o... Available to Purchase
Facies and sequence stratigraphy of two Cambrian grand cycles: implications for Cambrian sea level and origin of grand cycles Available to Purchase
Road Log from Kingman, Arizona, to Bagdad, Arizona: 97.2 miles Available to Purchase
Abstract 0.0 Exit to eastbound Interstate Highway 40 toward Flagstaff from Andy Devine Avenue in Kingman. 0.1 Behind and to the left in the foothills of the Cerbat Mountains is the Kingman Feldspar mine, a 1700 Ma zoned pegmatite (Heinrich, 1960; Wasserburg and Lanphere, 1965) that intrudes Early Proterozoic granitic rocks. Minerals of principal economic interest are microcline and allanite. 0.9 Prominent strata at the top of the Grand Wash Cliffs (fig. 26) in the far distance at 9:00 are Cambrian through Mississippian limestone and associated sedimentary rocks. Rocks beneath the Paleozoic section are mainly Early Proterozoic foliated to gneissic granite to granodiorite. Most of the Proterozoic rocks of the Grand Wash Cliffs are unmapped; only the Garnet Mountain area (Blacet, 1975; Theodore and others, 1982) has been mapped in any detail. 2.6 To the left and north is Hualapai Valley, which drains to the north into the playa of Red Lake at the northern end of the Cerbat Mountains. One of the thickest accumulations of halite in Arizona (minimum of 4,000 ft; possibly as thick as 10,000 ft) underlies Red Lake and the Hualapai Valley south of Red Lake (Peirce, 1973; 1976). 3.8 Crossing Rattlesnake Wash. Hills to our right are composed of mildly flow foliated, 1400 Ma coarse-grained porphyritic granite of Rattlesnake Hill 1400 (Kesler, 1976). 5.1 Outcrops on the right that weather into large bouldery piles are the granite of Rattlesnake Hill (fig. 24). 6.2 Exit 59, DW Ranch Road, provides access into the northern Hualapai Mountains. Roadcuts