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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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Chesapeake Bay impact structure (3)
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James River (2)
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Mexico (1)
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North America (1)
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United States
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Atlantic Coastal Plain
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Central Atlantic Coastal Plain (2)
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Chesapeake Bay (2)
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Delaware (3)
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Eastern U.S. (2)
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Florida
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Leon County Florida (1)
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Sarasota County Florida (1)
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Maryland (6)
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New Jersey (1)
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North Carolina
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Beaufort County North Carolina
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Lee Creek Mine (2)
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Bertie County North Carolina (2)
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Bladen County North Carolina (1)
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Columbus County North Carolina (1)
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Craven County North Carolina (1)
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New Hanover County North Carolina (1)
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Pamlico River (1)
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Surry County North Carolina (1)
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Salisbury Embayment (4)
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South Carolina
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Charleston County South Carolina (1)
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Virginia
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Dinwiddie County Virginia (2)
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Isle of Wight County Virginia (3)
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Northampton County Virginia (2)
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Petersburg Virginia (1)
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Surry County Virginia (2)
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elements, isotopes
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carbon
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C-13/C-12 (3)
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isotope ratios (2)
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isotopes
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stable isotopes
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C-13/C-12 (3)
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O-18/O-16 (3)
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oxygen
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O-18/O-16 (3)
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fossils
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borings (3)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Cetacea
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Mysticeti (1)
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Odontoceti (1)
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ichnofossils (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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Cirripedia (2)
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Mollusca
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Bivalvia
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Glycymeris (1)
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Heterodonta
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Veneroida
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Astartidae
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Astarte (1)
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Veneridae
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Mercenaria (2)
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Pterioida
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Pteriina
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Pectinacea
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Pectinidae (1)
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Cephalopoda
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Ammonoidea (1)
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Gastropoda
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Naticidae (1)
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Neogastropoda
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Muricidae (1)
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Turritellidae
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Turritella (1)
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Protista
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Foraminifera (7)
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microfossils (8)
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palynomorphs (1)
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Plantae
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algae
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diatoms (1)
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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
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Holocene (1)
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Pleistocene
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lower Pleistocene
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Gelasian (1)
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Waccamaw Formation (1)
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Tertiary
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Neogene
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Miocene
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Calvert Formation (7)
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lower Miocene
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Chipola Formation (1)
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middle Miocene
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Choptank Formation (5)
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Pungo River Formation (3)
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Saint Marys Formation (7)
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upper Miocene
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Duplin Formation (2)
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Eastover Formation (8)
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Pliocene
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middle Pliocene (1)
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upper Pliocene
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Chowan River Formation (10)
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Piacenzian (1)
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Yorktown Formation (35)
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Paleogene
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Eocene
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Castle Hayne Limestone (1)
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Nanjemoy Formation (2)
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upper Eocene
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Piney Point Formation (2)
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Oligocene (2)
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upper Cenozoic
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Chesapeake Group (3)
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Tamiami Formation (2)
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Mesozoic
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Upper Cretaceous
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Campanian (1)
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Senonian (1)
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Primary terms
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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carbon
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C-13/C-12 (3)
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Cenozoic
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Quaternary
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Holocene (1)
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Pleistocene
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lower Pleistocene
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Gelasian (1)
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Waccamaw Formation (1)
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Tertiary
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Neogene
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Miocene
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Calvert Formation (7)
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lower Miocene
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Chipola Formation (1)
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middle Miocene
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Choptank Formation (5)
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Pungo River Formation (3)
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Saint Marys Formation (7)
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upper Miocene
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Duplin Formation (2)
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Eastover Formation (8)
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Pliocene
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middle Pliocene (1)
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upper Pliocene
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Chowan River Formation (10)
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Piacenzian (1)
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Yorktown Formation (35)
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Paleogene
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Eocene
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Castle Hayne Limestone (1)
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Nanjemoy Formation (2)
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upper Eocene
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Piney Point Formation (2)
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Oligocene (2)
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upper Cenozoic
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Chesapeake Group (3)
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Tamiami Formation (2)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Cetacea
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climate change (1)
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data processing (2)
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deformation (1)
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earthquakes (1)
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faults (1)
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ground water (1)
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ichnofossils (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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Cirripedia (2)
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Mollusca
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Bivalvia
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Glycymeris (1)
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Heterodonta
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Veneroida
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Astartidae
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Astarte (1)
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Veneridae
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Mercenaria (2)
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Pterioida
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Pteriina
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Pectinacea
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Pectinidae (1)
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Cephalopoda
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Ammonoidea (1)
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Gastropoda
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Naticidae (1)
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Neogastropoda
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Muricidae (1)
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Turritellidae
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Turritella (1)
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-
-
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Protista
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Foraminifera (7)
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-
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isotopes
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stable isotopes
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C-13/C-12 (3)
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O-18/O-16 (3)
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-
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Mesozoic
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Cretaceous
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Potomac Group (1)
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Upper Cretaceous
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Campanian (1)
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Senonian (1)
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Mexico (1)
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North America (1)
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oxygen
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O-18/O-16 (3)
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paleoclimatology (6)
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paleoecology (9)
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paleogeography (1)
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paleontology (8)
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palynomorphs (1)
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Plantae
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algae
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diatoms (1)
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nannofossils (2)
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plate tectonics (1)
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sea-level changes (5)
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sedimentary rocks
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clastic rocks
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sedimentary structures
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planar bedding structures
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bedding (1)
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secondary structures
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concretions (1)
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sedimentation (6)
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sediments
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clastic sediments (1)
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shorelines (1)
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stratigraphy (10)
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thallophytes (1)
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United States
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Atlantic Coastal Plain
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Central Atlantic Coastal Plain (2)
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Chesapeake Bay (2)
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Delaware (3)
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Eastern U.S. (2)
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Florida
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Leon County Florida (1)
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Sarasota County Florida (1)
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Maryland (6)
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New Jersey (1)
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North Carolina
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Beaufort County North Carolina
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Lee Creek Mine (2)
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Bertie County North Carolina (2)
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Bladen County North Carolina (1)
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Columbus County North Carolina (1)
-
Craven County North Carolina (1)
-
New Hanover County North Carolina (1)
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Pamlico River (1)
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Surry County North Carolina (1)
-
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Salisbury Embayment (4)
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South Carolina
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Charleston County South Carolina (1)
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Virginia
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Dinwiddie County Virginia (2)
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Isle of Wight County Virginia (3)
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Northampton County Virginia (2)
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Petersburg Virginia (1)
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Surry County Virginia (2)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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sandstone (1)
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sedimentary structures
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borings (3)
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sedimentary structures
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planar bedding structures
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bedding (1)
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secondary structures
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concretions (1)
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sediments
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sediments
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clastic sediments (1)
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Yorktown Formation
Benthic Foraminiferal and Sedimentologic Changes in the Pliocene Yorktown Formation, Virginia, USA
ISOTOPIC TEMPERATURES FROM THE EARLY AND MID-PLIOCENE OF THE US MIDDLE ATLANTIC COASTAL PLAIN, AND THEIR IMPLICATIONS FOR THE CAUSE OF REGIONAL MARINE CLIMATE CHANGE
Mixed assemblages of drilling predators and the problem of identity in the fossil record: A case study using the muricid gastropod Ecphora
MULTIPROXY SCLEROCHRONOLOGICAL EVIDENCE FOR PLIO-PLEISTOCENE REGIONAL WARMTH: UNITED STATES MID-ATLANTIC COASTAL PLAIN
Two cores at the outer margin of the Chesapeake Bay impact structure show significant structural and depositional variations that illuminate its history. Detailed stratigraphy of the Watkins School core reveals that this site is outside the disruption boundary of the crater with respect to its lower part (nonmarine Cretaceous Potomac Formation), but just inside the boundary with respect to its upper part (Exmore Formation and a succession of upper Eocene to Pleistocene postimpact deposits). The site of the U.S. Geological Survey–National Aeronautics and Space Administration Langley core, 6.4 km to the east, lies wholly within the annular trough of the crater. The Potomac Formation in the Watkins School core is not noticeably impact disrupted. The lower part of crater unit A in the Langley core represents stratigraphically lower, but similarly undeformed material. The Exmore Formation is only 7.8 m thick in the Watkins School core, but it is over 200 m thick in the Langley core, where it contains blocks up to 24 m in intersected diameter. The upper part of the Exmore Formation in the two cores is a polymict diamicton with a stratified zone at the top. The postimpact sedimentary units in the two cores have similar late Eocene and late Miocene depositional histories and contrasting Oligocene, early Miocene, and middle Miocene histories. A paleochannel of the James River removed Pliocene deposits at the Watkins School site, to be filled later with thick Pleistocene deposits. At the Langley site, a thick Pliocene and thinner Pleistocene record is preserved.
A 443.9-m-thick, virtually undisturbed section of postimpact deposits in the Chesapeake Bay impact structure was recovered in the Eyreville A and C cores, Northampton County, Virginia, within the “moat” of the structure's central crater. Recovered sediments are mainly fine-grained marine siliciclastics, with the exception of Pleistocene sand, clay, and gravel. The lowest postimpact unit is the upper Eocene Chickahominy Formation (443.9–350.1 m). At 93.8 m, this is the maximum thickness yet recovered for deposits that represent the return to “normal marine” sedimentation. The Drummonds Corner beds (informal) and the Old Church Formation are thin Oligocene units present between 350.1 and 344.7 m. Above the Oligocene, there is a more typical Virginia coastal plain succession. The Calvert Formation (344.7–225.4 m) includes a thin lower Miocene part overlain by a much thicker middle Mio-cene part. From 225.4 to 206.0 m, sediments of the middle Miocene Choptank Formation, rarely reported in the Virginia coastal plain, are present. The thick upper Miocene St. Marys and Eastover Formations (206.0–57.8 m) appear to represent a more complete succession than in the type localities. Correlation with the nearby Kiptopeke core indicates that two Pliocene units are present: Yorktown (57.8–32.2 m) and Chowan River Formations (32.2–18.3 m). Sediments at the top of the section represent an upper Pleistocene channel-fill and are assigned to the Butlers Bluff and Occohannock Members of the Nassawadox Formation (18.3–0.6 m).
Asteroid and comet impact events are known to cause profound disruption to surface ecosystems. The aseptic collection of samples throughout a 1.76-km-deep set of cores recovered from the deep subsurface of the Chesapeake Bay impact structure has allowed the study of the subsurface biosphere in a region disrupted by an impactor. Microbiological enumerations suggest the presence of three major microbiological zones. The upper zone (127–867 m) is characterized by a logarithmic decline in microbial abundance from the surface through the postimpact section of Miocene to Upper Eocene marine sediments and across the transition into the upper layers of the impact tsunami resurge sediments and sediment megablocks. In the middle zone (867–1397 m) microbial abundances are below detection. This zone is predominantly quartz sand, primarily composed of boulders and blocks, and it may have been mostly sterilized by the thermal pulse delivered during impact. No samples were collected from the large granite block (1096–1371 m). The lowest zone (below 1397 m) of increasing microbial abundance coincides with a region of heavily impact-fractured, hydraulically conductive suevite and fractured schist. These zones correspond to lithologies influenced by impact processes. Our results yield insights into the influence of impacts on the deep subsurface biosphere.
Estimating multivariate selection gradients in the fossil record: a naticid gastropod case study
TIME COMPONENTS OF COMMUNITIES
BENTHIC FORAMINIFERA AND PALEOECOLOGY OF THE PLIOCENE YORKTOWN AND CHOWAN RIVER FORMATIONS, LEE CREEK MINE, NORTH CAROLINA, USA
Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia
Assembly, disassembly, and balance in marine paleocommunities
Chesapeakiceras, new name for Chesapeakella Kennedy and Cobban, 1993 (September 14), not Chesapeakella Campbell, 1993 (June 13)
Subtle changes in mature predator-prey systems; an example from Neogene Turritella (Gastropoda)
The petrosal and inner ear of Herpetocetus sp. (Mammalia; Cetacea) and their implications for the phylogeny and hearing of archaic mysticetes
Planktonic foraminiferal assemblage of the Yorktown Formation, Virginia, USA
Coastal Response to Late Pliocene Climate Change: Middle Atlantic Coastal Plain, Virginia and Delaware
Abstract The middle Atlantic Coastal Plain records the late Pliocene transition from typical marine deposition and coastlines of the Tertiary to that of fluvial-estuarine-marine of the Quaternary. The Early Pliocene Yorktown Formation (4.5-3.0 Ma) and Late Pliocene Chowan River Formation (approx. 2.8 Ma) record dominantly marine deposition in temperate to warm temperate climates with moderate- to low-sedimentation rates in a tectonically controlled basin. The Late Pliocene Bacons Castle Formation in Virginia (2.3-2.0 Ma) and the upper Beaverdam Formation of Delaware (2.3-2.0 Ma?) contain deposits with indicators of high rates of sedimentation, abundant sediment supply, an Appalachian source, and a cool terrestrial climate. Deposition was in response to a colder climate in the source area associated with Northern Hemisphere glaciation at approximately 2.4 Ma. Mechanical weathering and colluviation during a colder period moved sediment into the transport system that was later moved and deposited by high-discharge streams flowing into the coastal plain during subsequent warming. Deposition during the ensuing transgression kept pace with sea-level rise with some progradation of coastline. Later, Quaternary erosion and deposition in the region incised and partially reworked these late Pliocene deposits.