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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Tanzania (2)
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Nile Valley (1)
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North Africa
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Egypt
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Eastern Desert (1)
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Andros Island (1)
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Antarctica
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Antarctic ice sheet (4)
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Antarctic Peninsula (1)
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South Shetland Islands
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King George Island (1)
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West Antarctica (1)
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Arctic Ocean
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Barents Sea (1)
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Norwegian Sea (1)
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Arctic region
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Greenland (1)
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Svalbard
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Spitsbergen
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Spitsbergen Island (4)
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Asia
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Arabian Peninsula
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Oman (2)
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Far East
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China
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Shandong China
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Dongying Depression (1)
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Indonesia
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Japan
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Indian Peninsula
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Indian Ocean Islands
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International Ocean Discovery Program
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Expedition 353
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IODP Site U1443 (1)
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Expedition 355
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West Pacific
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C-13/C-12 (33)
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stable isotopes
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C-13/C-12 (33)
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Ca-44/Ca-40 (1)
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N-15/N-14 (3)
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O-18/O-16 (19)
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alkaline earth metals
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Mg/Ca (6)
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Sr/Ca (1)
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magnesium
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Mg/Ca (6)
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strontium
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Sr/Ca (1)
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aluminum (1)
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nitrogen
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N-15/N-14 (3)
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oxygen
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O-18/O-16 (19)
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phosphorus (2)
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sulfur
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S-34/S-32 (2)
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trace metals (1)
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fossils
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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Diapsida
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Archosauria
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-
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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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Copepoda (1)
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Ostracoda (5)
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Brachiopoda (4)
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Bryozoa (2)
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Cnidaria
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Anthozoa (2)
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Mollusca
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Bivalvia
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Pterioida
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Pteriina
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Pectinacea
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Halobia (1)
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Monotis (1)
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-
-
-
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Cephalopoda
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Ammonoidea (2)
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Nautiloidea
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Nautilus (2)
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Gastropoda
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Pteropoda (1)
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Porifera (1)
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Protista
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Foraminifera
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Rotaliina
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Buliminacea
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Bulimina (1)
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Cassidulinacea
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Anomalinidae
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Cibicidoides (2)
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-
-
Globigerinacea
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Globigerinidae
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Globigerina
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Globigerina bulloides (2)
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Globigerinoides
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Globigerinoides ruber (6)
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Globigerinoides sacculifer (4)
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Orbulina
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Orbulina universa (1)
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Sphaeroidinella
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Sphaeroidinella dehiscens (1)
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-
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Globorotaliidae
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Globorotalia
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Globorotalia inflata (1)
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Globorotalia menardii (3)
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Hedbergella (1)
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Heterohelicidae (1)
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Neogloboquadrina
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Neogloboquadrina dutertrei (3)
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Neogloboquadrina pachyderma (2)
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Orbitoidacea
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Cibicides (1)
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Nephrolepidina (1)
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Rotaliacea
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Heterostegina (1)
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Nummulitidae
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Nummulites
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Operculina (1)
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-
-
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Textulariina
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Lituolacea
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Trochammina (1)
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Radiolaria (6)
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Silicoflagellata (1)
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Vermes
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Annelida (1)
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microfossils
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Conodonta (6)
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Dinoflagellata (3)
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miospores
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Plantae
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diatoms (1)
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nannofossils
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Rhodophyta
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thallophytes (3)
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geochronology methods
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geologic age
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Cenozoic
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Quaternary
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upper Weichselian
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Younger Dryas (1)
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upper Quaternary
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Brunhes Chron (3)
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Siwalik System (1)
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Tertiary
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Esna Shale (1)
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Neogene
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Miocene
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middle Miocene (2)
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upper Miocene (3)
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Pliocene
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upper Neogene (1)
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Paleogene
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Eocene
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lower Eocene
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middle Eocene (4)
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upper Eocene (2)
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Oligocene
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lower Oligocene
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upper Oligocene (1)
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Paleocene
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lower Paleocene
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Danian (3)
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middle Paleocene (1)
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upper Paleocene (9)
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Paleocene-Eocene Thermal Maximum (16)
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upper Cenozoic (2)
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Mesozoic
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Cretaceous
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Alisitos Formation (1)
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Calera Limestone (1)
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Lower Cretaceous
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Albian
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upper Albian (1)
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Aptian (2)
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Upper Cretaceous
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Campanian (1)
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Forbes Formation (1)
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Rosario Formation (1)
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Turonian (2)
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Franciscan Complex (1)
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Jurassic
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Lower Jurassic
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Pliensbachian (1)
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Toarcian
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lower Toarcian (1)
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Triassic-Jurassic boundary (1)
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Middle Jurassic
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Bathonian (1)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (3)
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Upper Triassic
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Pardonet Formation (1)
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Triassic-Jurassic boundary (1)
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Paleozoic
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Cambrian
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Lower Cambrian (1)
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Carboniferous
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Middle Pennsylvanian (1)
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Upper Pennsylvanian (2)
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Devonian (2)
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lower Paleozoic (1)
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Permian
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Guadalupian
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Roadian (1)
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Wordian (1)
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Lower Permian
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Cisuralian
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Kungurian (1)
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Middle Permian (1)
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Park City Formation (2)
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Phosphoria Formation (1)
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Upper Permian
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Permian-Triassic boundary (3)
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-
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upper Paleozoic (1)
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Phanerozoic (5)
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Doushantuo Formation (1)
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Nantuo Formation (1)
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Torridonian (1)
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Vendian (1)
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Sinian
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Doushantuo Formation (1)
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Nantuo Formation (1)
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igneous rocks
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igneous rocks
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volcanic rocks
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basalts
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flood basalts (3)
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pyroclastics
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metamorphic rocks
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turbidite (3)
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minerals
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carbonates
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calcite (11)
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minerals (2)
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oxides (2)
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phosphates
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silicates
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chain silicates
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pyroxene group
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clinopyroxene
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wollastonite group
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-
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framework silicates
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feldspar group (2)
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silica minerals
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quartz (3)
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orthosilicates
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nesosilicates
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zircon group
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zircon (4)
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-
-
sheet silicates
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chlorite group
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chlorite (1)
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clay minerals
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kaolinite (2)
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illite (1)
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mica group
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palygorskite (1)
-
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sulfates
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gypsum (2)
-
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sulfides
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pyrite (1)
-
-
-
Primary terms
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absolute age (5)
-
Africa
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East Africa
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Tanzania (2)
-
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Nile Valley (1)
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North Africa
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Egypt
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Eastern Desert (1)
-
-
-
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Antarctica
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Antarctic ice sheet (4)
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Antarctic Peninsula (1)
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South Shetland Islands
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King George Island (1)
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West Antarctica (1)
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Arctic Ocean
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Barents Sea (1)
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Norwegian Sea (1)
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Arctic region
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Greenland (1)
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Svalbard
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Spitsbergen
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Asia
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Arabian Peninsula
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Oman (2)
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Far East
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China
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Guangxi China (1)
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Shandong China
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Dongying Depression (1)
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Sichuan China (1)
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Yangtze Platform (2)
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Indonesia
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Sunda Arc (1)
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Japan
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Honshu
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Niigata Japan (1)
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Ryukyu Islands (1)
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Indian Peninsula
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India
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Indus Basin (1)
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Indus River (1)
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Middle East
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Israel (1)
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Jordan (1)
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Turkey (1)
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Siberia (1)
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Atlantic Ocean
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Equatorial Atlantic (5)
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Mid-Atlantic Ridge (1)
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North Atlantic
-
Blake Plateau
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Blake Nose (2)
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-
Blake-Bahama Outer Ridge (1)
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Caribbean Sea (1)
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Ceara Rise (3)
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Great Bahama Bank (1)
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Gulf of Mexico (1)
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Gulf of Saint Lawrence (1)
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North Sea (1)
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Northeast Atlantic (1)
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Northwest Atlantic
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Demerara Rise (2)
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GeoRef Categories
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lysocline
Deep-sea carbonates: Acoustic reflectors and lysocline fluctuations Available to Purchase
Model of glacial water masses and the aragonite lysocline in the western At... Available to Purchase
DEEP-SEA CARBONATES: DISSOLUTION PROFILES FROM FORAMINIFERAL PRESERVATION Available to Purchase
ABSTRACT The foraminiferal lysocline, defined as the boundary zone between well-preserved and poorly preserved foraminiferal assemblages on the sea floor, is not by necessity a level of accelerated dissolution or “lysocline” in a general sense, such as found by Peterson (1966). The foram lysocline has the properties of a compensation depth, in that it can exist independently of the particular shape of a dissolution profile as long as rates increase with depth. There is considerable evidence for pronounced dissolution above the foram lysocline in the area just south of Peterson’s experiment. Detailed stratigraphic work and quantitative modeling of progressive dissolution of foram assemblages is necessary to establish to what degree the hydrographic lysocline (Peterson’s level) leaves a trace on the sea floor, in the form of a sedimentary lysocline; that is, a marked decrease in the rate of sedimentation.
Schematic representation of the TAZ for pelagic environments (not to scale)... Available to Purchase
DISTRIBUTION AND DISSOLUTION OF COCCOLITHS IN THE SOUTH AND CENTRAL PACIFIC Available to Purchase
ABSTRACT The distribution of coccoliths in surface sediments of the Pacific is greatly influenced by dissolution processes. Etching, fragmentation, and differential removal are obvious from about 3 km depth downward, and increase rapidly below about 4 km depth. Overgrowth is observed on some placoliths in samples at intermediate stages of dissolution. Cluster analysis defines groups of varying preservation aspects in tropical waters, in the central gyre, and at high latitudes. Dissolution rankings for tropical and extratropical regions are established using pairing analysis. The coccolith lysocline is difficult to define, but can be recognized near 4,000 m depth as a considerable drop in diversity of assemblages with respect to the solution resistance of their members. A comparison of dissolution aspects of coccoliths and forams shows that coccolith dissolution indices are sensitive above the lysocline and foram dissolution indices are sensitive below the lysocline.
Discussion on biogenic acid rain during the Late Cretaceous as a possible cause of extinctions Available to Purchase
Carbonate dissolution on the Muir Seamount (western North Atlantic); interglacial/glacial changes Available to Purchase
CaCO 3 SOLUTION IN THE TROPICAL EAST PACIFIC DURING THE PAST 130,000 YEARS Available to Purchase
ABSTRACT Application of various micropaleontological techniques and δ 18 O stratigraphy to cores from the tropical east Pacific reveals the record of temporal variations in CaCO 3 solution intensity in the area. In general, the solution intensity increased approximately 115,000–65,000 years BP, but according to the location with respect to the lysocline the information registered in the cores varies. Below the lysocline the magnitude of the fluctuations in the solution intensity is large. Near the lysocline the changes are relatively small. The increased solution intensity results in higher relative abundance of resistant planktonic foraminifera, but does not have an apparent effect on the percent CaCO 3 . Above the lysocline effects of increased solution are evident only at the end of the high solution period, and as in the previous case, the magnitude of the fluctuations is small and the percent of CaCO 3 is not affected. Comparison of the solution record of the equatorial Pacific with the record of CaCO 3 accumulation in high latitudes reveals that in general the solution intensity increases when more carbonate is deposited. There are some discrepancies however. The major changes in the solution occur several thousand years after the major changes in accumulation. It is theorized that the solution changes are driven by the variations in accumulation in the high latitudes, produced by climatic change. Since the amount of carbonate available for deposition in the ocean is limited, fluctuations in carbonate accumulation in the high latitudes are compensated by changes in the solution intensity. The timing discrepancy between the cause, climatic change, and the resulting solution may be due to the slow response time of the oceanic carbonate system.
SURVIVING IN THE WATER COLUMN: DEFINING THE TAPHONOMICALLY ACTIVE ZONE IN PELAGIC SYSTEMS Available to Purchase
Paleoecology and taphonomy of faunal assemblages in gray "core" (offshore) shales in Midcontinent Pennsylvanian cyclothems Available to Purchase
The late Pleistocene record of productivity fluctuations in the eastern equatorial Pacific Ocean Available to Purchase
Cenozoic History and Paleoceanography of the Central Equatorial Pacific Ocean: A Regional Synthesis of Deep Sea Drilling Project Data Available to Purchase
This study has three distinct but interrelated objectives: to prepare a geological synthesis of Deep Sea Drilling Project data from the central equatorial Pacific Ocean, to interpret this information in terms of the paleoceanographic history of this region, and to evaluate the usefulness of drill data and develop procedures and strategies for future studies of this kind. The investigation is based on primary data contained in the Initial Reports of the Deep Sea Drilling Project and is supported by information from surface cores. The principal data used are the biostratigraphy, lithology, carbonate content, bulk density, and porosity of the cores. From these properties, sedimentation rates, carbonate and carbonate-free accumulation rates, and paleobathymetric histories of the drill sites were derived with the aid of Berggren’s chronology. Paleopositions of the drill sites and surface cores were determined from rotation parameters of the Pacific and Cocos plates. The present surface and deep circulation, fertility patterns, and sedimentation of the equatorial Pacific constitute a frame of reference for the paleoceanographic evolution. East-west and north-south lithologic profiles show that a zone of maximum deposition approximately parallel to the Equator has existed at least since middle Eocene time. With increasing age, the axis of this zone is found progressively farther north of the Equator. The profiles illustrate a gradual change from calcareous to siliceous deposits with increasing depth at any time, and they indicate an abrupt change from a dominantly siliceous to a dominantly calcareous depositional regime at the Eocene-Oligocene boundary. Large changes with time in the width and sedimentation rate of the calcareous equatorial zone indicate major variations in depositional conditions since Eocene time. Subsidence with age of the oceanic basement, plate rotation, and changes in spreading rate are closely examined in this study. A northward shift of the equatorial zone of maximum deposition with age and trend and ages of linear volcanic island chains (melting spots) define the rotation of the Pacific plate. This gives a pole of rotation at lat 67° N, 59° W, and rotation rates of 0.25°/m.y. before and 0.83°/m.y. after 25 m.y. B.P. This rotation scheme describes the migration with time of the drill sites and, in combination with the subsidence histories of the drill sites, permits the reconstruction of the paleobathymetric evolution of the region. About 50 m.y. ago, the eastern edge of the Pacific plate was located at long. 115° W and migrated rapidly eastward during the next 20 to 30 m.y., becoming stationary at approximately long. 100° to 105° W, notwithstanding a large crestal jump from the Mathematicians-Clipperton ridge system to the present East Pacific Rise 10 to 15 m.y. ago. The ancestral East Pacific Rise was a relatively narrow, symmetric feature with steep upper slopes. About 25 m.y. ago, it developed a much broader and gentler west flank, thereby acquiring its present asymmetry. The early rise crest was much the change with time of the vertical gradient of the carbonate dissolution rate. This gradient appears to have responded mainly to changes in the structure of the deep and bottom waters, whereas the CCD was primarily determined by the global carbonate budget and by changes in the locus of carbonate deposition through time. After changes in carbonate dissolution are taken into account, variations in the carbonate and carbonate-free accumulation rates allow assessment of changes in upwelling and fertility. The paleoceanographic indicators resulting from the study, in context with data from other regions, yield the following oceanographic history for the past 50 m.y. During the initial phase, prior to 38 m.y. B.P., carbonate supply was low, and dissolution was extensive. This resulted in a narrow carbonate zone and low rates of accumulation. Silica was mobilized to form chert, and erosion became widespread. Around 38 m.y. B.P., carbonate input increased abruptly, and solution decreased markedly. As a result, the equatorial carbonate zone widened greatly. Bottom-water characteristics may have changed owing to the first extensive development of sea ice around Antarctica. About 33 m.y. B.P., dissolution rates at depth began to increase again, but this increase was compensated for either by a large increase in the carbonate supply or by a depression of the lysocline. As a result, until about 26 m.y. B.P., a very broad and extensive equatorial carbonate zone with maximal accumulation rates existed. The steepening of the dissolution gradient may be related to a decrease in influx of bottom water resulting from major hydrographic changes around Antarctica. The increase in carbonate supply may have resulted from final closure of the Tethys seaway and the ensuing narrowing and intensification of equatorial upwelling. About 15 m.y. B.P., the rate of carbonate dissolution increased further, and the CCD shoaled. As a result, the equatorial carbonate zone became much narrower, and many hiatuses were formed. At this time, the lysocline may have attained its present position, which suggests that the present configuration of sources and mechanisms of intermediate- and deep-water supply to the Pacific was being developed. This probably resulted from the major development of antarctic glaciation that began during this period and increased the supply of bottom water. Some evidence from the carbonate and carbonate-free accumulation rates also suggests an increase in the fertility of the equatorial region, perhaps resulting from closure of the western Pacific Ocean and the formation of the Cromwell Current at this time. About 3 to 4 m.y. B.P., the onset of arctic glaciation marked the beginning of large and rapid changes in depositional conditions that cannot be followed in detail with the Deep Sea Drilling Project data.