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all geography including DSDP/ODP Sites and Legs
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Africa
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Madagascar
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Nile Valley (1)
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Argyllshire Scotland
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USSR (6)
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Nd-144/Nd-143 (3)
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O-18/O-16 (54)
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Os-187/Os-186 (2)
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Os-188/Os-187 (4)
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Pb-206/Pb-204 (4)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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Sr-87/Sr-86 (16)
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aluminum
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Pb-206/Pb-204 (4)
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iridium (49)
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Os-187/Os-186 (2)
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Os-188/Os-187 (4)
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Re-187/Os-188 (1)
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platinum (4)
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Nd-144/Nd-143 (3)
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Re-187/Os-188 (1)
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nitrogen (2)
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oxygen
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O-18/O-16 (54)
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S-34/S-32 (2)
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Tetrapoda
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Aves
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Mammalia
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Rodentia (1)
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Metatheria
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Marsupialia
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Polyprotodontia
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Didelphidae (1)
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-
-
-
-
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Reptilia
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Anapsida
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Testudines
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Diapsida
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Archosauria
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Ornithischia
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Triceratops (1)
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-
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Ornithopoda
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-
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Saurischia
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Sauropodomorpha
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Sauropoda (3)
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Theropoda
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Carnosauria (1)
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Coelurosauria
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Tyrannosauridae
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Tyrannosaurus
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Tyrannosaurus rex (2)
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-
-
-
-
-
-
Pterosauria (1)
-
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Lepidosauria
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Squamata
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Lacertilia
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Mosasauridae (1)
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-
-
-
-
Testudinata (2)
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-
-
-
-
coprolites (1)
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Cyclostomata (1)
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ichnofossils
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Chondrites ichnofossils (3)
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Diplocraterion (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Cirripedia (1)
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Ostracoda
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Podocopida
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Bairdiacea
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Bairdiidae (1)
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Cypridocopina (1)
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Cytheracea
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Cytheridae (1)
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-
-
-
-
-
Insecta
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Pterygota
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Neoptera
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Orthopteroida (1)
-
-
-
-
-
-
Brachiopoda
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Articulata
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Rhynchonellida (2)
-
-
-
Bryozoa
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Cheilostomata (2)
-
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Cnidaria
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Anthozoa
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Zoantharia
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Scleractinia (2)
-
-
-
-
Echinodermata
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Crinozoa
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Crinoidea (2)
-
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Echinozoa
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Echinoidea (5)
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-
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Mollusca
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Bivalvia
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Heterodonta
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Rudistae (3)
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Veneroida
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Carditidae (1)
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-
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Nuculidae (1)
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Palaeoheterodonta
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Unionidae (1)
-
-
Pterioida
-
Pteriina
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Inocerami
-
Inoceramidae
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Inoceramus (1)
-
-
-
-
-
-
Cephalopoda
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Ammonoidea
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Ammonites (5)
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Scaphites (3)
-
-
Coleoidea
-
Belemnoidea
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Belemnitidae (2)
-
-
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Nautiloidea
-
Nautilus (1)
-
-
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Gastropoda
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Harpidae (1)
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Muricacea (1)
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Naticidae (1)
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Neogastropoda (3)
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Turritellidae
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Turritella (1)
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-
-
Scaphopoda (1)
-
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Porifera
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Demospongea (1)
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Hexactinellida (1)
-
-
Protista
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Foraminifera
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Rotaliina
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Globigerinacea
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Globigerinidae
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Globigerina (2)
-
-
Globotruncanidae (2)
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Hedbergella (4)
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Heterohelicidae (1)
-
-
Nodosariacea
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Nodosariidae
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Lenticulina (1)
-
-
-
Orbitoidacea (1)
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Rotaliacea
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Nummulitidae (1)
-
-
-
Textulariina
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Lituolacea
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Trochammina (1)
-
-
-
-
Radiolaria (5)
-
Silicoflagellata (1)
-
-
Vermes
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Polychaeta
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Serpulidae (1)
-
-
-
-
microfossils
-
Charophyta (3)
-
-
palynomorphs
-
Dinoflagellata (32)
-
megaspores (2)
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miospores
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Classopollis (2)
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pollen (24)
-
-
-
Plantae
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algae
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calcareous algae (1)
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Chlorophyta
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Charophyta (3)
-
Chlorophyceae
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Dasycladaceae (1)
-
-
-
Coccolithophoraceae
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Coccolithus (2)
-
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diatoms (4)
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Microcodium (2)
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nannofossils
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Pyrrhophyta (1)
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Rhodophyta
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Corallinaceae (1)
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-
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Pteridophyta
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Filicopsida
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Azolla (1)
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Lycopsida (1)
-
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Spermatophyta
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Angiospermae
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Dicotyledoneae (3)
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-
-
-
Gymnospermae
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Coniferales
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Pinaceae
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Larix (1)
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Taxodiaceae
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Metasequoia (1)
-
-
-
-
-
-
problematic fossils (1)
-
thallophytes (20)
-
tracks (2)
-
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geochronology methods
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(U-Th)/He (1)
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paleomagnetism (60)
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geologic age
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Cenozoic
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lower Cenozoic (1)
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Quaternary
-
Holocene (3)
-
Pleistocene
-
lower Pleistocene (1)
-
-
-
Tertiary
-
Cypress Hills Formation (1)
-
lower Tertiary (30)
-
Neogene
-
Miocene
-
lower Miocene (1)
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middle Miocene (1)
-
upper Miocene
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Messinian (1)
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Pontian (1)
-
-
-
Pliocene (3)
-
-
Paleogene
-
Eocene
-
Green River Formation (1)
-
lower Eocene
-
Aquia Formation (1)
-
Wasatchian (1)
-
Willwood Formation (1)
-
Ypresian
-
London Clay (1)
-
-
-
middle Eocene
-
Bartonian (1)
-
Lutetian (1)
-
-
upper Eocene
-
Priabonian (1)
-
-
-
Flagstaff Formation (1)
-
Hanna Formation (2)
-
Imo Shale (1)
-
lower Paleogene (8)
-
Oligocene
-
Fish Canyon Tuff (1)
-
lower Oligocene
-
Rupelian (1)
-
Stampian (1)
-
-
upper Oligocene
-
Chattian (1)
-
-
-
Paleocene
-
Clayton Formation (13)
-
Lebo Member (1)
-
lower Paleocene
-
Danian
-
Niniyur Group (2)
-
-
K-T boundary (432)
-
Puercan (31)
-
Torrejonian (27)
-
-
Ludlow Member (5)
-
middle Paleocene
-
Selandian (9)
-
-
Montian (5)
-
Nacimiento Formation (9)
-
Naheola Formation (1)
-
Porters Creek Formation (5)
-
Ravenscrag Formation (9)
-
Sentinel Butte Formation (1)
-
Tongue River Member (1)
-
Tullock Member (15)
-
upper Paleocene
-
Clarkforkian (3)
-
Thanetian (11)
-
Tiffanian (23)
-
-
-
Paleocene-Eocene Thermal Maximum (5)
-
Sinjar Formation (1)
-
Wasatch Formation (3)
-
Wilcox Group (2)
-
-
Sobral Formation (3)
-
upper Tertiary (1)
-
-
-
Mesozoic
-
Cretaceous
-
Graneros Shale (1)
-
Lower Cretaceous
-
Albian
-
upper Albian (3)
-
-
Aptian (3)
-
Berriasian (1)
-
Hauterivian (1)
-
Valanginian (1)
-
-
Middle Cretaceous (2)
-
Nenjiang Formation (1)
-
Shiranish Formation (1)
-
Upper Cretaceous
-
Bearpaw Formation (2)
-
Campanian
-
Dinosaur Park Formation (1)
-
lower Campanian (1)
-
upper Campanian (3)
-
-
Carlile Shale (1)
-
Cenomanian (8)
-
Colville Group (1)
-
Coniacian (2)
-
Duwi Formation (1)
-
Edmonton Group (1)
-
Elkhorn Mountains Volcanics (1)
-
Fox Hills Formation (5)
-
Fruitland Formation (4)
-
Ghareb Formation (1)
-
Greenhorn Limestone (1)
-
Gulfian
-
Aguja Formation (2)
-
Prairie Bluff Chalk (3)
-
-
Hell Creek Formation (38)
-
Horseshoe Canyon Formation (2)
-
Javelina Formation (3)
-
Judith River Formation (1)
-
Kirtland Shale (5)
-
K-T boundary (432)
-
Lameta Formation (3)
-
Lance Formation (8)
-
Laramie Formation (2)
-
Lewis Shale (1)
-
Maestrichtian
-
lower Maestrichtian (3)
-
upper Maestrichtian (24)
-
-
Maevarano Formation (1)
-
Magothy Formation (1)
-
Marshalltown Formation (2)
-
Mesaverde Group (2)
-
Moreno Formation (1)
-
Navesink Formation (4)
-
Niobrara Formation (1)
-
Ojo Alamo Sandstone (8)
-
Peedee Formation (1)
-
Pictured Cliffs Sandstone (1)
-
Pierre Shale (5)
-
Prince Creek Formation (1)
-
Ripley Formation (2)
-
Santonian (5)
-
Schrader Bluff Formation (1)
-
Senonian (92)
-
Turonian
-
lower Turonian (1)
-
-
-
Whitemud Formation (2)
-
Yacoraite Formation (1)
-
-
Franciscan Complex (2)
-
Great Valley Sequence (1)
-
Jurassic
-
Lower Jurassic
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Toarcian (1)
-
Triassic-Jurassic boundary (2)
-
-
Middle Jurassic
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Aalenian (1)
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Callovian (1)
-
-
Upper Jurassic
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Kimmeridge Clay (3)
-
-
-
Triassic
-
Lower Triassic
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Permian-Triassic boundary (5)
-
-
Upper Triassic
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Keuper (1)
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Norian (1)
-
Triassic-Jurassic boundary (2)
-
-
-
-
Paleozoic
-
Cambrian (2)
-
Carboniferous
-
Mississippian
-
Lower Mississippian
-
Cuyahoga Formation (1)
-
-
-
Upper Carboniferous
-
Westphalian (1)
-
-
-
Devonian
-
Lower Devonian (1)
-
Upper Devonian
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Famennian (1)
-
Frasnian (2)
-
-
-
Ordovician
-
Upper Ordovician (3)
-
-
Permian
-
Guadalupian
-
Capitan Formation (1)
-
-
Lower Permian (1)
-
Upper Permian
-
Permian-Triassic boundary (5)
-
-
-
-
Phanerozoic (4)
-
Precambrian
-
Archean
-
Neoarchean (2)
-
-
Hadean (1)
-
Lewisian Complex (1)
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Belt Supergroup (1)
-
-
Neoproterozoic (1)
-
Paleoproterozoic (1)
-
-
-
-
-
igneous rocks
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extrusive rocks (1)
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igneous rocks
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picrite (1)
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plutonic rocks
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diabase (1)
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gabbros (1)
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lamprophyres (1)
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pegmatite (1)
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ultramafics (1)
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volcanic rocks
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andesites (2)
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basalts
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alkali basalts (1)
-
flood basalts (17)
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mid-ocean ridge basalts (2)
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ocean-island basalts (2)
-
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dacites (1)
-
glasses
-
volcanic glass (1)
-
-
pyroclastics
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ignimbrite (1)
-
tuff (2)
-
-
rhyodacites (1)
-
rhyolites (1)
-
-
-
ophiolite (2)
-
volcanic ash (4)
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses (1)
-
impactites
-
impact breccia
-
suevite (2)
-
-
-
migmatites (1)
-
-
ophiolite (2)
-
turbidite (6)
-
-
meteorites
-
meteorites
-
stony meteorites
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chondrites
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ordinary chondrites
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L chondrites (1)
-
-
-
-
-
-
minerals
-
carbonates
-
calcite (7)
-
dolomite (1)
-
magnesian calcite (1)
-
-
native elements
-
diamond (2)
-
-
oxides
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goethite (5)
-
hematite (6)
-
iron oxides (1)
-
maghemite (1)
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magnesioferrite (1)
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magnetite (3)
-
spinel (3)
-
spinel group (1)
-
titanomagnetite (2)
-
-
phosphates
-
apatite (4)
-
goyazite (1)
-
-
silicates
-
chain silicates
-
pyroxene group
-
clinopyroxene (2)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
sanidine (5)
-
-
plagioclase (2)
-
-
silica minerals
-
quartz (14)
-
-
zeolite group (1)
-
-
orthosilicates
-
nesosilicates
-
garnet group
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hydrogarnet (1)
-
-
olivine group
-
olivine (1)
-
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (16)
-
-
-
-
sheet silicates
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chlorite group
-
chlorite (1)
-
-
clay minerals
-
halloysite (2)
-
kaolinite (8)
-
nontronite (1)
-
smectite (17)
-
-
illite (8)
-
mica group
-
biotite (1)
-
glauconite (2)
-
-
palygorskite (2)
-
-
-
sulfates
-
anhydrite (1)
-
jarosite (2)
-
-
sulfides
-
chalcopyrite (1)
-
pyrite (5)
-
-
sulfosalts
-
sulfantimonites
-
tetrahedrite (1)
-
-
-
-
Primary terms
-
absolute age (44)
-
Africa
-
Madagascar
-
Mahajanga Basin (1)
-
-
Nile Valley (1)
-
North Africa
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Algeria (1)
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Egypt
-
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-
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Textulariina
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Lituolacea
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Trochammina (1)
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Radiolaria (5)
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Silicoflagellata (1)
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Vermes
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Polychaeta
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Serpulidae (1)
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (1)
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Os-187/Os-186 (2)
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Pb-206/Pb-204 (4)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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Re-187/Os-188 (1)
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stable isotopes
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Al-27 (1)
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Ar-40/Ar-39 (1)
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C-13/C-12 (80)
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Ca-44/Ca-40 (2)
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (3)
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O-18/O-16 (54)
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Os-187/Os-186 (2)
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Os-188/Os-187 (4)
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Pb-206/Pb-204 (4)
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Pb-207/Pb-204 (2)
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Pb-208/Pb-204 (2)
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Re-187/Os-188 (1)
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S-34/S-32 (2)
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Sr-87/Sr-86 (16)
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lava (10)
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magmas (10)
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Malay Archipelago
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Timor (1)
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mantle (9)
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maps (2)
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Mediterranean region (3)
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Mediterranean Sea
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East Mediterranean
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Adriatic Sea (1)
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Black Sea (1)
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Mesozoic
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Cretaceous
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Graneros Shale (1)
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Lower Cretaceous
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Albian
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upper Albian (3)
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Aptian (3)
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Berriasian (1)
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Hauterivian (1)
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Valanginian (1)
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Middle Cretaceous (2)
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Nenjiang Formation (1)
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Shiranish Formation (1)
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Upper Cretaceous
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Bearpaw Formation (2)
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Campanian
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Dinosaur Park Formation (1)
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lower Campanian (1)
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upper Campanian (3)
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Carlile Shale (1)
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Cenomanian (8)
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Colville Group (1)
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Coniacian (2)
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Duwi Formation (1)
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Edmonton Group (1)
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Elkhorn Mountains Volcanics (1)
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Fox Hills Formation (5)
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Fruitland Formation (4)
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Ghareb Formation (1)
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Greenhorn Limestone (1)
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Gulfian
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Aguja Formation (2)
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Prairie Bluff Chalk (3)
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Hell Creek Formation (38)
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Horseshoe Canyon Formation (2)
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Javelina Formation (3)
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Judith River Formation (1)
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Kirtland Shale (5)
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K-T boundary (432)
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Lameta Formation (3)
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Lance Formation (8)
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Laramie Formation (2)
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Lewis Shale (1)
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Maestrichtian
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lower Maestrichtian (3)
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upper Maestrichtian (24)
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Maevarano Formation (1)
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Magothy Formation (1)
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Marshalltown Formation (2)
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Mesaverde Group (2)
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Moreno Formation (1)
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Navesink Formation (4)
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Niobrara Formation (1)
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Ojo Alamo Sandstone (8)
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Peedee Formation (1)
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Pictured Cliffs Sandstone (1)
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Pierre Shale (5)
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Prince Creek Formation (1)
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Ripley Formation (2)
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Santonian (5)
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Schrader Bluff Formation (1)
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Senonian (92)
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Turonian
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lower Turonian (1)
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Whitemud Formation (2)
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Yacoraite Formation (1)
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Franciscan Complex (2)
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Great Valley Sequence (1)
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Jurassic
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Lower Jurassic
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Toarcian (1)
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Triassic-Jurassic boundary (2)
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Middle Jurassic
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Aalenian (1)
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Callovian (1)
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Upper Jurassic
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Kimmeridge Clay (3)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (5)
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Upper Triassic
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Keuper (1)
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Norian (1)
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Triassic-Jurassic boundary (2)
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metal ores
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Ca-44/Ca-40 (2)
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magnesium
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Mg/Ca (1)
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strontium
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Sr-87/Sr-86 (16)
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aluminum
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Al-27 (1)
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chromium (4)
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hafnium
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Hf-177/Hf-176 (1)
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iron
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lead
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Pb-206/Pb-204 (4)
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Pb-208/Pb-204 (2)
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mercury (6)
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iridium (49)
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osmium
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Os-187/Os-186 (2)
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Os-188/Os-187 (4)
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Re-187/Os-188 (1)
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platinum (4)
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rare earths
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lutetium (1)
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neodymium
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Nd-144/Nd-143 (3)
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rhenium
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Re-187/Os-188 (1)
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silver (2)
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metamorphic rocks
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L chondrites (1)
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Mexico
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North America
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Disturbed Belt (1)
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Western Interior
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ocean basins (2)
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Ocean Drilling Program
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Leg 113
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ODP Site 689 (1)
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ODP Site 690 (6)
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Leg 114
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ODP Site 698 (1)
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Leg 115
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ODP Site 707 (1)
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Leg 119
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ODP Site 738 (5)
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Leg 120
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ODP Site 748 (1)
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ODP Site 750 (3)
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Leg 122
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ODP Site 761 (2)
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Leg 130
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ODP Site 803 (1)
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ODP Site 804 (1)
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ODP Site 805 (1)
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ODP Site 806 (1)
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ODP Site 807 (2)
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Leg 132
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ODP Site 810 (1)
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Leg 165
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ODP Site 1001 (1)
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ODP Site 999 (1)
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Leg 171B
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ODP Site 1049 (8)
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ODP Site 1050 (6)
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ODP Site 1052 (4)
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Leg 174AX (3)
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Leg 198
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ODP Site 1209 (2)
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ODP Site 1210 (4)
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ODP Site 1211 (1)
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ODP Site 1212 (2)
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Leg 207
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ODP Site 1258 (1)
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ODP Site 1259 (3)
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Leg 208
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ODP Site 1262 (6)
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ocean floors (6)
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Oceania
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Polynesia
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Hawaii
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Hawaii County Hawaii
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Hawaii Island
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Kilauea (1)
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Mauna Loa (1)
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oceanography (1)
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oil and gas fields (22)
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oxygen
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dissolved oxygen (1)
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O-18/O-16 (54)
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Pacific Ocean
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Equatorial Pacific (2)
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Northwest Pacific
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South Pacific
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West Pacific
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Ontong Java Plateau (3)
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paleobotany (7)
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paleoclimatology (83)
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paleoecology (156)
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paleogeography (58)
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paleomagnetism (60)
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Paleozoic
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Cambrian (2)
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Carboniferous
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Cuyahoga Formation (1)
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Upper Carboniferous
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Westphalian (1)
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Devonian
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Ordovician
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Upper Ordovician (3)
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Permian
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Guadalupian
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Capitan Formation (1)
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Lower Permian (1)
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Permian-Triassic boundary (5)
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palynology (1)
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palynomorphs
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Dinoflagellata (32)
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Plantae
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Pteridophyta
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Filicopsida
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Spermatophyta
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Gymnospermae
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Coniferales
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Taxodiaceae
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Metasequoia (1)
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plate tectonics (26)
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Precambrian
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problematic fossils (1)
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coal
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sedimentary structures
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sedimentation (54)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
lower Paleocene
Transcrustal magmatic system in lamprophyre dike constructed by multiple magma reservoirs
A New Fauna from the Deccan Intertrappean Sediments of Central India Reveals KP Extinction and Survivorship, and Origins of Asiatic Freshwater Molluscs
Deep marine records of Deccan Trap volcanism before the Cretaceous–Paleogene (K–Pg) mass extinction
Magnetostratigraphy and Sedimentology of Deccan Intertrappean Succession from Sagar, Central India: Insights into Palaeoenvironment and End-Cretaceous Palaeogeography
Carbonate mounds formed by mud volcanism at the Cretaceous-Paleogene boundary, Saudi Arabia
Biotic and abiotic factors and the phylogenetic structure of extinction in the evolution of Tethysuchia
Moderate magnitude clockwise rotation of the Yunlong Basin: Implications for synchronous Eocene rotation of the southeastern Tibetan Plateau
Palynology of the uppermost Cretaceous to lowermost Paleocene Deccan volcanic associated sediments of the Mandla Lobe, central India
Abstract This study documents a variety of deposits created by submarine landslides within the Upper Cretaceous to lowermost Paleocene Chalk Group in the Danish Central Graben and investigates the impact of remobilization on porosity. Improved visualization of the landslides in 3D seismic data compared with previous studies was facilitated by better seismic data quality for the Chalk Group, the availability of a large stack of stratigraphy-consistent horizons and the use of spectral decomposition data. The illustrated examples are chosen to reflect the spectrum of deformation styles seen in the chalk and all have a well penetrating the affected succession. They include a large collapse (375 km 2 ) of an inversion ridge within the Kraka and Gorm formations, a field of large slide blocks (100–1000 m, 10–26 m) of likely lowermost Danian age embedded in the uppermost Ekofisk Formation, a debris flow system within the uppermost Tor Formation probably originating from the Ringkøbing–Fyn High and fine-grained bottom current sediment waves within the lowermost Danian Ekofisk Formation. In general, porosities are higher (10–25 porosity units) in the remobilized chalk compared with time-equivalent pelagic chalk in nearby reference wells. In earlier studies this has been linked to lack of bioturbation (resulting in limited grain repacking) in the remobilized chalks owing to high sedimentation rates, resulting in a relatively open fabric during initial burial. In contrast, surrounding and covering pelagic deposits could be much more effectively bioturbated, leading to tighter grain packing during burial. The insights of this study help in the seismic characterization of mud-grade carbonate oozes and have important applications in the reservoir modelling of mud-grade carbonate reservoirs (also in light of carbon capture and storage), and in palaeo-reconstructions of pelagic seafloors since submarine landslides provide kinematic indicators.
Angle-dependent 4D seismic time-strain inversion for estimating subsurface thickness and velocity changes
Discovery of Stenothyrid Gastropod from Deccan Intertrappean at Barga Village, Madhya Pradesh and its Palaeoenvironmental Significance
A late refugium for Classopollis in the Paleocene Lower Wilcox Group along the Texas Gulf Coast
Nodulina kuhnti n. Sp. and nodulina eugubina n. Sp., New Agglutinated Foraminifera from the Lower Paleocene of the Scaglia Rossa, Umbria–Marche Basin, Italy
Warming, acidification, and calcification feedback during the first hyperthermal of the Cenozoic—The Latest Danian Event
Lithostratigraphy of the Paleogene Deccan Intra-, Intertrappeans of the Saurashtra, Western India and their Prevalence in Large Igneous Provinces
Magmatic arc evolution during the tectonic closure of the Rocas Verdes basin: insights from Cretaceous–earliest Paleocene intrusive rocks of Navarino Island (55°S), Fuegian Andes
U-Pb dating of pedogenic calcite near the Permian–Triassic boundary, Karoo Basin, South Africa
Cretaceous–Paleogene tectonic reconstructions of the South Scotia Ridge and implications for the initiation of subduction in the Scotia Sea
Peak-ring magnetism: Rock and mineral magnetic properties of the Chicxulub impact crater
ABSTRACT This field guide presents a one-day excursion in Prince George’s County, Maryland, USA, and documents the transition across the Cretaceous-Paleogene boundary by examining sediments from the upper Maastrichtian of the Severn Formation to the Paleocene sediments of the Brightseat and Aquia formations. Emphasis is placed on understanding how differences in depositional character and lithostratigraphy are related to changes in both microfossil and macrofossil assemblages. Particular attention is given to the difficulty in distinguishing Upper Cretaceous sediments from lower Paleocene sediments in the field, a problem that has traditionally led to misrepresentation of the distribution and thickness of these units and their correlation on a regional scale. Regarding the Late Cretaceous geology, the guide presents information on the lithology and microfossil biostratigraphy of the Severn Formation, which consists predominantly of silty quartz sand, with less than 5% clay. These sediments are placed in calcareous nannofossil Zone CC25a, suggesting an early late Maastrichtian age. Low abundances of planktic foraminifera combined with sedimentological evidence suggest deposition most likely occurred in a middle neritic environment. Macrofossils in the outcrops along the field trip consist primarily of fragmented bivalve mollusk and cephalopod shell material. A hiatus of ~5 m.y. separates the Cretaceous sediments from the overlying Paleocene deposits. As for the Paleocene geology, the guide presents information on the Brightseat and Aquia formations. The Brightseat represents early Danian age deposition and consists of clayey, silty sand at the base that grades upward into a silty sand. Glauconite is present at <5% throughout the formation in outcrop. Sediments of the Brightseat Formation are placed in calcareous nannofossil Zone NP3. Macrofossils are limited to small bivalve fragments that are scattered throughout. A hiatus representing ~3 m.y. separates the Brightseat from the overlying Aquia Formation, which is Selandian to Thanetian in age and consists of a glauconite-rich (~10%–20%), silty sand with common to abundant macrofossils, including both fragmented and complete gastropods and bivalves.