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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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Southern Africa
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South Africa
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Gauteng South Africa
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San Luis Obispo County California
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Santa Ana Mountains (4)
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Santa Barbara County California
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Point Conception (8)
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Santa Barbara California (27)
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Santa Cruz County California
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Santa Monica Mountains (16)
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stable isotopes
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C-13/C-12 (10)
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deuterium (2)
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Nd-144/Nd-143 (1)
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O-18/O-16 (14)
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Sr-87/Sr-86 (3)
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metals
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actinides
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uranium (1)
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alkaline earth metals
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beryllium
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Be-10 (3)
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magnesium (1)
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strontium
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Sr-87/Sr-86 (3)
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aluminum
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Al-26 (1)
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iron (1)
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manganese (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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noble gases
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helium
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oxygen
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O-18/O-16 (14)
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phosphorus (1)
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fossils
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Mammalia
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fungi (1)
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Invertebrata
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Crustacea
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Cirripedia (1)
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Ostracoda
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Insecta
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Pterygota
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Palaeoptera
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Odonata (1)
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Brachiopoda
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Articulata
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Rhynchonellida
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Rhynchonellidae (1)
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Cnidaria
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Anthozoa (1)
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Echinodermata
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Asterozoa
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Echinozoa
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Mollusca
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Bivalvia
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Heterodonta
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Rudistae (1)
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Ostreoidea
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Ostreidae
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Crassostrea
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Crassostrea virginica (1)
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Cephalopoda
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Coleoidea
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Belemnoidea
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Belemnitidae (1)
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Gastropoda
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Harpidae (1)
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Neogastropoda (2)
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-
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Protista
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Foraminifera
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Rotaliina
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Buliminacea
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Bolivinitidae
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Bolivina (2)
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Bulimina (1)
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Uvigerinidae
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Uvigerina
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Uvigerina peregrina (1)
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-
-
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Discorbacea (1)
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Globigerinacea
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Globigerinidae
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Globigerina
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Globigerina bulloides (3)
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-
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Neogloboquadrina
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Neogloboquadrina pachyderma (3)
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-
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Nodosariacea (1)
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-
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Radiolaria (3)
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Silicoflagellata (2)
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Vermes
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Annelida (1)
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microfossils (37)
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palynomorphs
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Dinoflagellata (2)
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miospores
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pollen (2)
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Plantae
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algae
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Coccolithophoraceae (2)
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diatoms
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Nitzschia (1)
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nannofossils
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Discoasteridae (1)
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Bryophyta
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Musci
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Sphagnum (1)
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Spermatophyta
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Angiospermae
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Dicotyledoneae
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Acer (1)
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Carya (1)
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Ericaceae (1)
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Salix (1)
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Ulmus (1)
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Gymnospermae
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Coniferales
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Pinaceae
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Pinus (1)
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thallophytes (7)
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geochronology methods
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fission-track dating (1)
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infrared stimulated luminescence (4)
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paleomagnetism (6)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene
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Weichselian
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upper Weichselian
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upper Quaternary (19)
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Saugus Formation (5)
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Tertiary
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lower Tertiary (1)
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middle Tertiary (1)
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Neogene
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Miocene
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lower Miocene (4)
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middle Miocene
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Luisian (2)
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Mohnian (2)
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Temblor Formation (1)
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upper Miocene
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Castaic Formation (1)
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Modelo Formation (2)
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Montesano Formation (1)
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Santa Margarita Formation (1)
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Pliocene
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lower Pliocene (5)
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middle Pliocene (1)
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upper Pliocene (2)
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Purisima Formation (1)
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Ridge Route Formation (2)
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Sisquoc Formation (9)
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Paleogene
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Eocene
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Cozy Dell Formation (3)
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Llajas Formation (3)
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lower Eocene (5)
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Matilija Formation (4)
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middle Eocene (2)
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upper Eocene (1)
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lower Paleogene (1)
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Oligocene (7)
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Paleocene
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lower Paleocene
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Danian (1)
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upper Paleocene
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Thanetian (1)
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-
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Santa Susana Formation (5)
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Sespe Formation (2)
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upper Tertiary (1)
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Vaqueros Formation (2)
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upper Cenozoic
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Pico Formation (4)
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Mesozoic
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Cretaceous
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Chatsworth Formation (2)
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Upper Cretaceous
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Campanian (3)
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Franciscan Complex (2)
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upper Mesozoic (1)
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Paleozoic
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igneous rocks
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silicates
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silica minerals
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orthosilicates
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sheet silicates
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clay minerals (1)
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serpentine group
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chrysotile (1)
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serpentine (1)
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-
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sulfates
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gypsum (2)
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thenardite (1)
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sulfides
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pyrite (1)
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-
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Primary terms
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absolute age (19)
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academic institutions (1)
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Africa
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Central Africa
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Angola (1)
-
-
Southern Africa
-
South Africa
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Gauteng South Africa
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Johannesburg South Africa (1)
-
-
-
-
-
Antarctica
-
Antarctic Peninsula (1)
-
-
Asia
-
Far East
-
Japan
-
Honshu
-
Hyogo Japan
-
Kobe Japan (1)
-
-
-
-
-
-
associations (1)
-
Atlantic Ocean
-
North Atlantic
-
Amazon Fan (1)
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Caribbean Sea (1)
-
Gulf of Mexico
-
Florida Bay (1)
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Mississippi Fan (1)
-
-
North Sea (1)
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Northwest Atlantic (2)
-
-
-
atmosphere (1)
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Australasia
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Australia
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Western Australia
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-
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bacteria (1)
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bibliography (1)
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biogeography (4)
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bitumens (1)
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Canada
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British Columbia (1)
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Canadian Rocky Mountains (1)
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-
-
carbon
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C-13/C-12 (10)
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C-14 (14)
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organic carbon (5)
-
-
Caribbean region
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West Indies
-
Antilles
-
Greater Antilles
-
Hispaniola
-
Haiti (1)
-
-
-
-
-
-
Cenozoic
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middle Cenozoic (1)
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Quaternary
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Holocene
-
upper Holocene (6)
-
-
Pleistocene
-
lower Pleistocene (2)
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middle Pleistocene (1)
-
upper Pleistocene
-
Weichselian
-
upper Weichselian
-
Younger Dryas (1)
-
-
-
-
-
upper Quaternary (19)
-
-
Saugus Formation (5)
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Tertiary
-
lower Tertiary (1)
-
middle Tertiary (1)
-
Neogene
-
Miocene
-
lower Miocene (4)
-
middle Miocene
-
Luisian (2)
-
-
Mohnian (2)
-
Temblor Formation (1)
-
upper Miocene
-
Castaic Formation (1)
-
Modelo Formation (2)
-
Montesano Formation (1)
-
Santa Margarita Formation (1)
-
-
-
Pliocene
-
lower Pliocene (5)
-
middle Pliocene (1)
-
upper Pliocene (2)
-
-
Purisima Formation (1)
-
Ridge Route Formation (2)
-
Sisquoc Formation (9)
-
-
Paleogene
-
Eocene
-
Cozy Dell Formation (3)
-
Llajas Formation (3)
-
lower Eocene (5)
-
Matilija Formation (4)
-
middle Eocene (2)
-
upper Eocene (1)
-
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lower Paleogene (1)
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Oligocene (7)
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Paleocene
-
lower Paleocene
-
Danian (1)
-
-
upper Paleocene
-
Thanetian (1)
-
-
-
Santa Susana Formation (5)
-
Sespe Formation (2)
-
-
upper Tertiary (1)
-
Vaqueros Formation (2)
-
-
upper Cenozoic
-
Pico Formation (4)
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-
-
chemical analysis (1)
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Chordata
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Vertebrata
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Tetrapoda
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Aves (1)
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Mammalia
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Theria
-
Eutheria
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Carnivora
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Europe
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Germany
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Pyrenees
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Southern Europe
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Iberian Peninsula
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Spain
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Spanish Pyrenees (1)
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Western Europe
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France
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Alsace (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
NEOTAPHONOMIC SURVEY OF SMALL TAR SEEPS IN SOUTHERN CALIFORNIA Available to Purchase
The 17 January 1994 Northridge, California, Earthquake: A Retrospective Analysis Open Access
The Ojai California Earthquake of 20 August 2023: Earthquake Early Warning Performance and Alert Recipient Response in the M w 5.1 Event Available to Purchase
Disturbance and recovery of physical elements of habitat in relation to post-wildfire channel sedimentation, southern California Transverse Ranges Available to Purchase
ABSTRACT Sedimentation after wildfire is a profound disturbance to the biogeomorphic character of fluvial systems. Despite this significant alteration, field data focusing on the geomorphic processes and bed morphology that form the physical structure of habitat are limited, especially over a longer-term perspective. We report results of detailed field studies following two wildfires in the same steep fluvial system in the southern California Transverse Ranges three decades apart. Substantial channel sedimentation during storms following both fires altered physical elements of habitat, which included bed elevation, step height and spacing, pool depth and spacing, grain-size distribution (D 84), and transport capacity (τ o /τ c). The postfire sediment deposits buried bedforms, decreased D 84 , and increased τ o /τ c by an order of magnitude. Incision during subsequent storms initiated recovery that depended on the attributes of post-wildfire climate variability that characterize the semiarid Mediterranean-type environment. Step-pool bedforms reappeared or reformed during the decades between wildfires as the relatively fine gravel-sized post-wildfire sediment was transported downstream, thus reestablishing the physical elements of habitat characterizing the dynamic system.
A Methodology to Combine Shaking and Ground Failure Models for Forecasting Seismic Damage to Buried Pipeline Networks Available to Purchase
Methodology for Including Path Effects Due to 3D Velocity Structure in Nonergodic Ground‐Motion Models Available to Purchase
Contemporary Salt-Marsh Foraminifera from Southern California and Implications for Reconstructing Late Holocene Sea-Level Changes Open Access
Use of multibeam bathymetry and backscatter to improve seabed geochemical surveys — Part 1: Historical review, technical description, and best practices Available to Purchase
Topographic development of a compressional mountain range, the western Transverse Ranges of California, USA, resulted from localized uplift along individual structures and regional uplift from deeper shortening Open Access
Directional Sensitivity of DAS and Its Effect on Rayleigh‐Wave Tomography: A Case Study in Oxnard, California Available to Purchase
When the levee breaks: Visualization of a deepwater crevasse splay in Late Cretaceous in Exmouth Basin Offshore Western Australia Available to Purchase
Mechanical Models of Fault‐Slip Rates in the Transverse and Peninsular Ranges, California Available to Purchase
Late Pleistocene Slip Rate and 3D Geometry of the Mid‐Channel Blind Thrust, Santa Barbara Channel, California, and Their Implications for Earthquake Hazards Available to Purchase
Compositional and diagenetic control of bed- to formational-scale deformation in siliceous sedimentary rocks, Santa Maria Basin, California Available to Purchase
ABSTRACT Rock properties play a critical role in dictating styles of deformation at all spatial scales, yet the effect of changes across and within diagenetic transition zones has been little studied, despite profound impact on resulting mechanical stratigraphy. Our analysis of the variation of fold strain at map scale and outcrop scale of the highly siliceous Monterey and Sisquoc Formations in the southern Santa Maria Basin, California, provides insight into the interplay among deformation, diagenesis, and rock composition. Diagenetic modification of these rocks has created intervals with high interstratal and interformational contrasts in competence. Map-scale analysis showed large variation in fold strain within the same area, with shortening values ranging from 5.5% to 21.1% between siliceous formations of different diagenetic grade and competence. Apparent shortening in the competent, diagenetically altered, thinly bedded Monterey Formation is twice as high as that in the overlying highly porous, diatomaceous, more massive Sisquoc Formation. The large difference in measurable apparent shortening suggests that the same amount of actual strain was chiefly accommodated by folding in the Monterey Formation versus horizontal compaction in the Sisquoc Formation, since there is no evidence of a detachment between the units. Strain analysis at outcrop scale provided insight into the ways in which both units express such different shortening ratios without having an unconformity or detachment fault between them.
Miocene terrestrial paleoclimates inferred from pollen in the Monterey Formation, Naples Coastal Bluffs section, California Available to Purchase
ABSTRACT We present here a comprehensive record of Miocene terrestrial ecosystems from exposures of the Monterey Formation along the Naples coastal bluffs, west of Santa Barbara, California. Constrained by an updated chronology, pollen analyses of 28 samples deposited between 18 and 6 Ma reflect the demise of mesophytic taxa that grew in a warm, wet environment during the late early and early middle Miocene and the development of a summer-dry/winter-wet Mediterranean climate during the late Miocene. Broadleaf tree pollen from mesophytic woodlands and forests now found in the southeastern United States and China ( Liquidambar , Tilia , Ulmus , Carya ) characterized the Miocene climatic optimum (16.9–14.7 Ma), the middle Miocene climate transition (14.7–13.8 Ma), and the interval up to ca. 13.0 Ma. Subsequently, during the late middle to early late Miocene, between 13.3 and 9.0 Ma, oak woodlands and herbs (Asteraceae, Amaranthaceae, Poaceae) from beach scrub and chaparral increased as ocean temperatures cooled and the climate became drier. Between ca. 8.9 and 7.6 Ma, pine increased mostly at the expense of oak ( Quercus ) and herbs, suggesting a period of increasing precipitation. During the latest Miocene (7.5–6.0 Ma), an increase of herb-dominated ecosystems (chaparral, coastal scrub) at the expense of pine reflects the full development of a summer-dry/winter-wet climate in coastal southern California.
Relationship of organic carbon deposition in the Monterey Formation to the Monterey excursion event based on an updated chronostratigraphic framework of the Naples Beach section, California Available to Purchase
ABSTRACT The Monterey Formation, consisting of siliceous and calcareous biogenic sediments, was deposited during the transition from a relatively warm greenhouse climate in the early Miocene to the cooler temperatures of icehouse climatic conditions during the early middle to late Miocene. This cooling event was associated with global paleoclimatic and oceanic changes assumed to be related to the deposition of organic carbon–rich sediments into the marginal basins of California. This chapter introduces an age model for the Miocene strata at Naples Beach based on a composite stratigraphic section and standardized data set, providing the framework for the integration of biostratigraphic zones with a series of astronomically tuned siliceous and calcareous microfossil bioevents, an updated strontium isotope stratigraphy, new tephrochronology ages, and ages from specific magnetostratigraphic units. This multidisciplinary approach, utilizing the integration of microfossil disciplines with independent age controls, is critical to obtaining an age resolution of ~200 k.y. for the majority of the Monterey Formation section. This chronostratigraphic framework improves the age control of the boundaries between the California benthic foraminiferal stages and provides more age refinement for the possible hiatus and condensed interval within the Carbonaceous Marl member of the Monterey Formation. The recalibrated ages for the tops of the Miocene benthic foraminiferal stages are Saucesian (ca. 17.4 Ma), Relizian (15.9 Ma), Luisian (13.1 Ma), and Mohnian (7.7 Ma). Also, the time missing in the hiatus between the Luisian and Mohnian is <200 k.y., and the duration of the condensed interval is from 13.0 to 11 Ma. This refined age model provides a correlation of the organic carbon–rich intervals occurring in the Luisian and lower Mohnian stages within the Naples Beach strata to the deep-sea δ 13 C maxima events CM5 (ca. 14.7 Ma) and CM6 (ca. 13.6 Ma), suggesting episodic increases in organic carbon deposition along the continental margins coincided with the Miocene carbon isotope excursion found in deep-sea cores. The transition from the Miocene climatic optimum to the icehouse world consisted of four climatic and oceanic phases (from ca. 17.5 to ca. 7 Ma), which are represented in the onshore section by variations in the organic carbon and phosphate contents, the occurrence of calcareous and siliceous lithologic facies, and the distribution of microfossils, especially changes in the benthic foraminiferal assemblages.
Tephrochronology of the Miocene Monterey and Modelo Formations, California Available to Purchase
ABSTRACT Tuff beds (volcanic ash beds and tuffs) have been known in the Miocene Monterey and Modelo Formations since they were initially described nearly 100 yr ago. Yet, these tephra layers have remained largely ignored. The ages and correlation of the Monterey and Modelo Formations are predominantly based on associated biostratigraphy. Here, we combined tephrochronology and biostratigraphy to provide more precise numerical age control for eight sedimentary sequences of the Monterey and Modelo Formations from Monterey County to Orange County in California. We correlated 38 tephra beds in the Monterey and Modelo Formations to 26 different dated tephra layers found mainly in nonmarine sequences in Nevada, Idaho, and New Mexico. We also present geochemical data for an additional 19 tephra layers in the Monterey and Modelo Formations, for which there are no known correlative tephra layers, and geochemical data for another 11 previously uncharacterized tephra layers in other areas of western North America. Correlated tephra layers range in age from 16 to 7 Ma; 31 tephra layers erupted from volcanic centers of the Snake River Plain, northern Nevada to eastern Idaho; 13 other tephra layers erupted from the Southern Nevada volcanic field; and the eruptive source is unknown for 12 other tephra layers. These tephra layers provide new time-stratigraphic markers for the Monterey and Modelo Formations and for other marine and nonmarine sequences in western North America. We identified tephra deposits of four supereruptions as much as 1200 km from the eruptive sources: Rainier Mesa (Southern Nevada volcanic field) and Cougar Point Tuff XI, Cougar Point Tuff XIII, and McMullen Creek (all Snake River Plain).