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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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West Africa
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Ghana (3)
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Ivory Coast (4)
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Arctic Ocean
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Lomonosov Ridge (1)
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Norwegian Sea
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Voring Plateau (1)
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Atlantic Ocean
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East Atlantic (1)
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Equatorial Atlantic (5)
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North Atlantic
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Cape Verde Basin (1)
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Cape Verde Rise (1)
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Gulf of Guinea (2)
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Gulf of Mexico (1)
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Northwest Atlantic
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Demerara Rise (1)
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South Atlantic
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Angola Basin (1)
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Walvis Ridge (1)
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West Atlantic (1)
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Chicxulub Crater (1)
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Indian Ocean (1)
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International Ocean Discovery Program (1)
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North America
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Western Interior
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Western Interior Seaway (1)
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ODP Site 642 (1)
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Pacific Ocean
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South Pacific
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Southwest Pacific
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Tasman Sea (1)
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West Pacific
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Southwest Pacific
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Tasman Sea (1)
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South America (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (1)
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United States
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Atlantic Coastal Plain (1)
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elements, isotopes
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carbon
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C-13/C-12 (2)
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organic carbon (1)
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isotope ratios (3)
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isotopes
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stable isotopes
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C-13/C-12 (2)
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O-18/O-16 (2)
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metals
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iron (1)
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oxygen
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O-18/O-16 (2)
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fossils
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Invertebrata
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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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Globigerinoides
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Globigerinoides sacculifer (1)
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Globorotaliidae
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Globorotalia (1)
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microfossils (5)
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palynomorphs
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Dinoflagellata (3)
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Plantae
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algae
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nannofossils (2)
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geochronology methods
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fission-track dating (1)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene (1)
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Tertiary
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Neogene
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Miocene (2)
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Pliocene
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lower Pliocene (1)
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Paleogene
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Eocene
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middle Eocene (1)
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Oligocene (1)
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Paleocene-Eocene Thermal Maximum (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Coniacian (1)
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Santonian (1)
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Senonian (1)
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minerals
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phosphates
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apatite (1)
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silicates
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framework silicates
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silica minerals
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quartz (1)
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sheet silicates
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clay minerals
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montmorillonite (1)
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smectite (1)
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mica group
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glauconite (1)
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Primary terms
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Africa
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West Africa
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Ghana (3)
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Ivory Coast (4)
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Arctic Ocean
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Lomonosov Ridge (1)
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Norwegian Sea
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Voring Plateau (1)
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Atlantic Ocean
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East Atlantic (1)
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Equatorial Atlantic (5)
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North Atlantic
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Cape Verde Basin (1)
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Cape Verde Rise (1)
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Gulf of Guinea (2)
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Gulf of Mexico (1)
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Northwest Atlantic
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Demerara Rise (1)
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South Atlantic
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Angola Basin (1)
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Walvis Ridge (1)
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West Atlantic (1)
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biogeography (1)
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carbon
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C-13/C-12 (2)
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organic carbon (1)
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Cenozoic
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Quaternary
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Pleistocene (1)
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Tertiary
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Neogene
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Miocene (2)
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Pliocene
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lower Pliocene (1)
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Paleogene
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Eocene
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middle Eocene (1)
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Oligocene (1)
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Paleocene-Eocene Thermal Maximum (1)
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clay mineralogy (2)
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climate change (2)
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Deep Sea Drilling Project
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IPOD
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DSDP Site 603 (1)
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Leg 75
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DSDP Site 530 (1)
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Leg 14
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DSDP Site 144 (1)
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Leg 23
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DSDP Site 219 (1)
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Leg 39
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DSDP Site 356 (1)
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Leg 40
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DSDP Site 361 (1)
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DSDP Site 364 (1)
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Leg 41
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DSDP Site 367 (1)
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DSDP Site 368 (1)
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Leg 9
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DSDP Site 78 (1)
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faults (1)
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geochronology (1)
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geophysical methods (1)
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Indian Ocean (1)
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Integrated Ocean Drilling Program (1)
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Invertebrata
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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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Globigerinoides
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Globigerinoides sacculifer (1)
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Globorotaliidae
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Globorotalia (1)
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isotopes
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stable isotopes
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C-13/C-12 (2)
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O-18/O-16 (2)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Coniacian (1)
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Santonian (1)
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Senonian (1)
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metals
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iron (1)
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metamorphism (2)
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North America
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Western Interior
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Western Interior Seaway (1)
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Ocean Drilling Program
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Leg 104 (1)
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Leg 113
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ODP Site 690 (1)
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Leg 130
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ODP Site 806 (1)
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Leg 138
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ODP Site 851 (1)
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Leg 143
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ODP Site 865 (1)
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Leg 144
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ODP Site 871 (1)
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ODP Site 872 (1)
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ODP Site 873 (1)
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Leg 154
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ODP Site 925 (1)
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Leg 159
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ODP Site 959 (10)
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ODP Site 960 (2)
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ODP Site 961 (1)
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ODP Site 962 (1)
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Leg 174AX (1)
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Leg 189
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ODP Site 1172 (1)
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Leg 207
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ODP Site 1257 (1)
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oxygen
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O-18/O-16 (2)
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Pacific Ocean
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South Pacific
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Southwest Pacific
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Tasman Sea (1)
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West Pacific
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Southwest Pacific
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Tasman Sea (1)
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paleoclimatology (3)
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paleoecology (1)
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palynomorphs
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Dinoflagellata (3)
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Plantae
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algae
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nannofossils (2)
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plate tectonics (1)
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sedimentary rocks
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clastic rocks
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black shale (2)
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sediments
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marine sediments (1)
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South America (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (1)
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tectonics (1)
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United States
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Atlantic Coastal Plain (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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black shale (2)
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sediments
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sediments
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marine sediments (1)
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ODP Site 959
Stratigraphic and sedimentological aspects of the worldwide distribution of Apectodinium in Paleocene/Eocene Thermal Maximum deposits
Abstract The Paleocene/Eocene Thermal Maximum (PETM) is characterized by pronounced global warming and associated environmental changes. In the more-or-less two decades since prior regional syntheses of Apectodinium distribution at the PETM, extensive biological and geochemical datasets have elucidated the effect of rising world temperatures on climate and the biome. A Carbon Isotope Excursion (CIE) that marks the Paleocene/Eocene Boundary is associated with an acme of marine dinocysts of the genus Apectodinium in many locations. Distinctive foraminiferal and calcareous nannofossil populations may also be present. For this updated, dinocyst-oriented view of the PETM, data from worldwide locations have been evaluated with an emphasis on stratigraphic and sedimentological context. What has emerged is that a change in lithology is common, often to a distinctive siltstone or claystone unit, which contrasts with underlying and overlying lithotypes. This change, present in shallow marine/coastal settings and in deep-water turbidite deposits, is attributed to radical modifications of precipitation and erosional processes. An abrupt boundary carries the implication that some time (of unknowable duration) is potentially missing, which then requires caution in the interpretation of the pacing of events in relation to that boundary. In most instances an ‘abrupt’ or ‘rapid’ CIE onset can be attributed to a data gap at a hiatus, particularly in shallow shelf settings where transgression resulted from sea-level rise associated with the PETM. Truly gradational lower boundaries of the PETM interval are quite unusual and, if present, are poorly known so far. Gradational upper boundaries are more common, but erosional upper boundaries have been reported. Taxonomic changes have been made to clarify identification issues that have adversely impacted some biostratigraphic interpretations. Apectodinium hyperacanthum has been retained in Wetzeliella , its original genus. The majority of specimens previously assigned to Apectodinium hyperacanthum or Wetzeliella ( Apectodinium ) hyperacanthum have been reassigned to an informal species, Apectodinium sp. 1. Dracodinium astra has been retained in its original genus as Wetzeliella astra and is emended.
Harmful algae and export production collapse in the equatorial Atlantic during the zenith of Middle Eocene Climatic Optimum warmth
THE RATE AND MECHANISM OF DEEP-SEA GLAUCONITE FORMATION AT THE IVORY COAST–GHANA MARGINAL RIDGE
Abstract Post-Turonian (Late Cretaceous) rudist-bearing limestones of the Nurra region in northwestern Sardinia (northern Tethyan margin) and in the central-southern Apennines and Apulia (central Tethyan domain) have recorded relevant changes in the characteristics of the carbonate platforms following the “middle” Cretaceous crisis events which affected the peri-Tethyan region as well as other regions worldwide. Rudist bivalves became the dominant lithogenetic taxon owing to their proliferation in shallow-water environments and strong dominance of Late Cretaceous carbonate factories. Their inception, evolution, and demise were seemingly controlled by a complex interplay of environmental processes that, acting on a global scale, profoundly modified the Early Cretaceous hydrosphere-atmosphere system and forced Tethyan depositional systems to change their organization, internal architecture, and facies patterns. As a result, wide, open shelves developed where the almost ubiquitous mode of carbonate fixation was that of foramol factories. In this paper, evidence of the remarkable regional variability in the rudist-bearing carbonate platforms of the Mediterranean Tethys is presented. The analysis of the resulting shallow-water facies has demonstrated that, in spite of several stratigraphic similarities and common sedimentological features, some remarkable differences occurred between the northern Tethyan margin and the central Tethyan banks as regards the areal partitioning of the main paleoecologic controlling factors. This resulted in the deposition of rhodalgal successions in Sardinia (northern Tethyan margin) and rudist-rich foramol facies in the Apennine-Apulia (central Tethys) regions, respectively. Such Late Cretaceous carbonate systems can be viewed as geological products which have closely and coherently recorded the globally changing environmental conditions of the oceanic realm. In spite of this, the difference of the facies partitioning in different Tethyan regions according to a latitudinal gradient is interpreted as derived mainly from local variable paleoceanographic and paleoclimatic conditions.