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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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South Africa (1)
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-
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Antarctica (2)
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Asia
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Popigay Structure (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Ceara Rise (1)
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Labrador Sea (1)
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Northeast Atlantic
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Iberian abyssal plain (1)
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Northwest Atlantic
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Demerara Rise (1)
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Sierra Leone Rise (1)
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South Atlantic
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Angola Basin (2)
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Brazil Basin (1)
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Cape Basin (2)
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Falkland Plateau (2)
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Rio Grande Rise (1)
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Walvis Ridge (1)
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West Atlantic (1)
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Australasia
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New Zealand (1)
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Commonwealth of Independent States
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Russian Federation
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Popigay Structure (1)
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-
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Georgia Basin (1)
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Kerguelen Plateau (2)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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South Pacific
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Southwest Pacific
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Lord Howe Rise (1)
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West Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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Southwest Pacific
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Lord Howe Rise (1)
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Southern Hemisphere (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (3)
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-
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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O-18/O-16 (2)
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metals
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platinum group
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iridium (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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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda (1)
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Protista
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Foraminifera (2)
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microfossils (4)
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Plantae
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algae
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nannofossils (2)
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thallophytes (1)
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geologic age
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Cenozoic
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Quaternary (1)
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Tertiary
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Paleogene
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Eocene
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upper Eocene (2)
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Oligocene
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lower Oligocene (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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Jurassic (1)
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minerals
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silicates
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chain silicates
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pyroxene group
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clinopyroxene (1)
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framework silicates
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silica minerals
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coesite (1)
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quartz (1)
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Primary terms
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Africa
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Southern Africa
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South Africa (1)
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Antarctica (2)
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Asia
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Popigay Structure (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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-
Ceara Rise (1)
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Labrador Sea (1)
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Northeast Atlantic
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Iberian abyssal plain (1)
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Northwest Atlantic
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Demerara Rise (1)
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Sierra Leone Rise (1)
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South Atlantic
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Angola Basin (2)
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Brazil Basin (1)
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Cape Basin (2)
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Falkland Plateau (2)
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Rio Grande Rise (1)
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Walvis Ridge (1)
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West Atlantic (1)
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Australasia
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New Zealand (1)
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Cenozoic
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Quaternary (1)
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Tertiary
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Paleogene
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Eocene
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upper Eocene (2)
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Oligocene
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lower Oligocene (1)
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Deep Sea Drilling Project
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IPOD
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Leg 71
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DSDP Site 511 (1)
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DSDP Site 513 (2)
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DSDP Site 514 (1)
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Leg 72
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DSDP Site 516 (1)
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DSDP Site 517 (1)
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Leg 73
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DSDP Site 519 (1)
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DSDP Site 522 (2)
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DSDP Site 524 (1)
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Leg 74
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DSDP Site 525 (1)
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Leg 78A
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DSDP Site 543 (1)
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Leg 90
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DSDP Site 592 (1)
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Leg 12
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DSDP Site 111 (1)
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Leg 14
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DSDP Site 144 (1)
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Leg 36
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DSDP Site 327 (2)
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DSDP Site 328 (1)
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DSDP Site 329 (1)
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DSDP Site 330 (1)
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Leg 39
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DSDP Site 354 (1)
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DSDP Site 355 (1)
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DSDP Site 356 (1)
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DSDP Site 357 (1)
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Leg 40
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DSDP Site 361 (1)
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DSDP Site 362 (1)
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DSDP Site 363 (1)
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DSDP Site 364 (1)
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Leg 41
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DSDP Site 366 (1)
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda (1)
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-
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Protista
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Foraminifera (2)
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-
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isotopes
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stable isotopes
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O-18/O-16 (2)
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-
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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Jurassic (1)
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metals
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platinum group
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iridium (1)
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metamorphism (1)
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museums (1)
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Ocean Drilling Program
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Leg 105
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ODP Site 647 (1)
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Leg 108
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ODP Site 664 (1)
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Leg 110
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ODP Site 672 (1)
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ODP Site 674 (1)
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Leg 113
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ODP Site 689 (4)
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ODP Site 690 (1)
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Leg 114
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ODP Site 698 (1)
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ODP Site 699 (5)
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ODP Site 700 (2)
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ODP Site 702 (1)
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ODP Site 703 (3)
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ODP Site 704 (1)
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Leg 115
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ODP Site 709 (1)
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Leg 119
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ODP Site 738 (2)
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ODP Site 744 (3)
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Leg 120
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ODP Site 747 (1)
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ODP Site 748 (2)
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ODP Site 749 (1)
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Leg 121
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ODP Site 757 (1)
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Leg 122
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ODP Site 762 (1)
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ODP Site 763 (1)
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Leg 125
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ODP Site 782 (1)
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ODP Site 786 (1)
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Leg 145
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ODP Site 884 (1)
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Leg 149
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ODP Site 900 (1)
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Leg 154
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ODP Site 925 (1)
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ODP Site 927 (1)
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ODP Site 929 (1)
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Leg 159
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ODP Site 960 (1)
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ODP Site 961 (1)
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Leg 171B
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ODP Site 1053 (1)
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Leg 174A
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ODP Site 1073 (1)
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Leg 175
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ODP Site 1087 (1)
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Leg 177
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ODP Site 1088 (1)
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ODP Site 1089 (1)
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ODP Site 1090 (2)
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ODP Site 1091 (1)
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ODP Site 1092 (1)
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ODP Site 1093 (1)
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ODP Site 1094 (1)
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Leg 183
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ODP Site 1135 (1)
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ODP Site 1136 (1)
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Leg 207
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ODP Site 1258 (1)
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ODP Site 1260 (1)
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Leg 208
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ODP Site 1262 (1)
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ODP Site 1263 (1)
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ODP Site 1264 (1)
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ODP Site 1265 (1)
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ODP Site 1266 (1)
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ODP Site 1267 (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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North Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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-
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South Pacific
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Southwest Pacific
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Lord Howe Rise (1)
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-
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West Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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Southwest Pacific
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Lord Howe Rise (1)
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-
-
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paleoclimatology (1)
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paleoecology (1)
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Plantae
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algae
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nannofossils (2)
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-
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Southern Hemisphere (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (3)
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-
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stratigraphy (1)
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tektites (1)
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thallophytes (1)
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ODP Site 699
The carbonate compensation depth in the South Atlantic Ocean since the Late Cretaceous
R. V. Dingle Ostracod Collection: Natural History Museum, London
In order to better define the late Eocene clinopyroxene-bearing (cpx) spherule layer and to determine how the ejecta vary with distance from the presumed source crater (Popigai), we searched for the layer at 23 additional sites. We identified the layer at six (maybe seven) of these sites: Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) Holes 592, 699A, 703A, 709C, 786A, 1090B, and probably 738B. The cpx spherule layer occurs in magnetochron 16n.1n, which indicates an age of ca. 35.4 ± 0.1 Ma for the layer. We found the highest abundance of cpx spherules and associated microtektites in Hole 709C in the northwest Indian Ocean, and we found coesite and shocked quartz in the cpx spherule layer at this site. We also found coesite in the cpx spherule layer at Site 216 in the northeast Indian Ocean. This is the first time that coesite has been found in the cpx spherule layer, and it provides additional support for the impact origin of this layer. In addition, the discovery of coesite and shocked quartz grains (with planar deformation features [PDFs]) supports the conclusion that the pancake-shaped clay spherules associated with quartz grains exhibiting PDFs are diagenetically altered cpx spherules. An Ir anomaly was found associated with the cpx spherule layer at all four of the new sites (699A, 709C, 738B, 1090B) for which we obtained Ir data. The geometric mean of the Ir fluence for the 12 sites with Ir data is 5.7 ng/cm 2 , which is ~10% of the fluence estimated for the Cretaceous-Tertiary boundary. Based on the geographic distribution of the 23 sites now known to contain the cpx spherule layer, and 12 sites where we have good chronostratigraphy but the cpx spherule layer is apparently absent, we propose that the cpx spherule strewn field may have a ray-like distribution pattern. Within one of the rays, the abundance of spherules decreases and the percent microtektites increases with distance from Popigai. Shocked quartz and coesite have been found only in this ray at the two sites that are closest to Popigai. At several sites in the Southern Ocean, an increase in δ 18 O in the bulk carbonate occurs immediately above the cpx spherule layer. This increase may indicate a drop in temperature coincident with the impact that produced the cpx spherule layer.