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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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North Africa
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Egypt
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Nile Delta (1)
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Antarctica
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Antarctic ice sheet (1)
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East Antarctica (1)
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Asia
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Gulf of Saint Lawrence (1)
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Spencer Gulf (1)
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New Zealand
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Taranaki New Zealand (1)
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Papua New Guinea
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Huon Peninsula (1)
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Baffin Bay (1)
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Canada
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Arctic Archipelago (14)
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Eastern Canada
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Cape Dyer (1)
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Maritime Provinces
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Nova Scotia
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Newfoundland and Labrador
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Labrador (1)
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Newfoundland (1)
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Nunavut
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oxygen
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fossils
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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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Carnivora
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Fissipeda
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Ursidae (1)
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Perissodactyla
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Equidae
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Equus (1)
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Proboscidea
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Elephantoidea
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Elephantidae
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Mammuthus
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Mammuthus columbi (1)
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Mastodontoidea (1)
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Invertebrata
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Spermatophyta
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Coniferales
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minerals
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Primary terms
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absolute age (55)
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Africa
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Egypt
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Nile Delta (1)
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Antarctica
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Arctic region
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Asia
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Australasia
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biogeography (5)
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carbon
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Bahamas (2)
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Cenozoic
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lower Holocene (1)
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upper Holocene (6)
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Pleistocene
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Champlain Sea (1)
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Lake Agassiz (1)
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lower Pleistocene
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Waccamaw Formation (1)
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middle Pleistocene (3)
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Peoria Loess (1)
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upper Pleistocene
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Sangamonian (1)
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Weichselian (1)
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Wisconsinan
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upper Wisconsinan (1)
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-
-
-
upper Quaternary (11)
-
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Saugus Formation (1)
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Tertiary
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Neogene
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Miocene
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upper Miocene (1)
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Pliocene
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lower Pliocene (1)
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upper Pliocene (3)
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upper Tertiary (1)
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upper Cenozoic (2)
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Central America
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Panama (1)
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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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Artiodactyla
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Ruminantia
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Bison (1)
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-
-
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Carnivora
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Fissipeda
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Ursidae (1)
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-
-
Perissodactyla
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Hippomorpha
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Equidae
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Equus (1)
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-
-
-
Proboscidea
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Elephantoidea
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Elephantidae
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Mammuthus
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Mammuthus columbi (1)
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-
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Mastodontoidea (1)
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climate change (3)
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Integrated Ocean Drilling Program
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Expedition 313
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IODP Site M0027 (1)
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IODP Site M0029 (1)
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-
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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
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Podocopida
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Cypridocopina
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Cyprididae
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Candona (1)
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-
-
-
-
-
Insecta (1)
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-
-
Brachiopoda
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Articulata
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Terebratulida (3)
-
-
-
Cnidaria
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Anthozoa (3)
-
-
Mollusca
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Bivalvia
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Glycymeris (1)
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Heterodonta
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Hiatella
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Hiatella arctica (1)
-
-
Veneroida
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Cardiidae (1)
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Mactra (1)
-
Veneridae
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Chione (1)
-
Mercenaria (2)
-
-
-
-
Mytilus
-
Mytilus edulis (1)
-
-
-
Gastropoda
-
Archaeogastropoda (1)
-
-
-
Porifera (1)
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Protista
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Foraminifera (6)
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Radiolaria (1)
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-
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isostasy (1)
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isotopes
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radioactive isotopes
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C-14 (50)
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Cl-36 (1)
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Pa-231 (1)
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Pb-210 (2)
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Ra-226 (1)
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Th-230 (2)
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (3)
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-
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Mediterranean region (1)
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Mediterranean Sea
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East Mediterranean
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Adriatic Sea
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Gulf of Trieste (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
Kanguk Formation (1)
-
-
-
-
metals
-
actinides
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protactinium
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Pa-231 (1)
-
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thorium
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Th-230 (2)
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-
uranium (1)
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alkaline earth metals
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radium
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Ra-226 (1)
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-
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lead
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Pb-210 (2)
-
-
-
Mexico
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Baja California (1)
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Baja California Sur Mexico (1)
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Colorado River delta (1)
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North America
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Basin and Range Province
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Great Basin (3)
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Great Lakes
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Lake Ontario (1)
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Rocky Mountains
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Canadian Rocky Mountains (1)
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Saint Lawrence Lowlands (1)
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oceanography (1)
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oxygen
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O-18/O-16 (3)
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Pacific Ocean
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Mendocino fracture zone (1)
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North Pacific
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Northeast Pacific
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Gulf of California (2)
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Mendocino fracture zone (1)
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-
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South Pacific
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Southwest Pacific
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Coral Sea
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Great Barrier Reef (2)
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West Pacific
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Coral Sea
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Great Barrier Reef (2)
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paleoclimatology (19)
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Paleozoic (1)
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Phanerozoic (1)
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Plantae
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algae
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diatoms (4)
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nannofossils (1)
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Spermatophyta
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Gymnospermae
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Coniferales
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Picea
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Picea glauca (1)
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plate tectonics (1)
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pollution (1)
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racemization
Refining the middle-late Pleistocene chronology of marine terraces and uplift history in a sector of the Apulian foreland (southern Italy) by applying a synchronous correlation technique and amino acid racemization to Patella spp. and Thetystrombus latus
Middle and late Pleistocene pluvial history of Newark Valley, central Nevada, USA
ABSTRACT Newark Valley lies between the two largest pluvial lake systems in the Great Basin, Lake Lahontan and Lake Bonneville. Soils and geomorphology, stratigraphic interpretations, radiocarbon ages, and amino acid racemization geochronology analyses were employed to interpret the relative and numerical ages of lacustrine deposits in the valley. The marine oxygen isotope stage (MIS) 2 beach barriers are characterized by well-preserved morphology and deposits with youthful soil development, with Bwk horizons and maximum stage I+ carbonate morphology. Radiocarbon ages of gastropods and tufas within these MIS 2–age deposits permit construction of a latest Pleistocene lake-level curve for Newark Valley, including a maximum limiting age of 13,780 ± 50 14 C yr B.P. for the most recent highstand, and they provide a calibration point for soil development in lacustrine deposits in the central Great Basin. The MIS 8–age to MIS 4–age beach barriers are higher in elevation and represent a larger lake than existed during MIS 2. The beach barriers have subdued morphology, are only preserved in short segments, and have stronger soil development, with Bkm and/or Bkmt horizons and maximum stage III+ to IV carbonate morphology. Newark Lake reached elevations higher than the MIS 2 highstand during at least two additional pluvial periods, MIS 16 and MIS 12, 10, or 8. These oldest lacustrine deposits do not have preserved shoreline features and are represented only by gravel lags, buried deposits, and buried soils with similar strong soil development. This sequence of middle and latest Pleistocene shorelines records a long-term pluvial history in this basin that remained internally drained for the last four or more pluvial cycles. Obtaining numerical ages from material within lacustrine deposits in the Great Basin can be challenging. Amino acid D/L values from gastropod shells and mollusk valves proved to be a valuable tool to correlate lacustrine deposits within Newark Valley. Comparison of soils and geomorphology results to independent 36 Cl cosmogenic nuclide ages from a different study indicated unexpected changes in rates of soil development during the past ~200,000 yr and suggested that common stratigraphic changes in lake stratigraphy could obscure incremental changes in soil development and/or complicate 36 Cl cosmogenic nuclide age estimates.
TRACING ORIGIN AND COLLAPSE OF HOLOCENE BENTHIC BASELINE COMMUNITIES IN THE NORTHERN ADRIATIC SEA
A review of MIS 7 and MIS 5 terrace deposits along the Gulf of Taranto based on new stratigraphic and chronological data
SPATIAL VARIATION IN THE TEMPORAL RESOLUTION OF SUBTROPICAL SHALLOW-WATER MOLLUSCAN DEATH ASSEMBLAGES
Stratigraphic unmixing reveals repeated hypoxia events over the past 500 yr in the northern Adriatic Sea
TIME-AVERAGING AND STRATIGRAPHIC RESOLUTION IN DEATH ASSEMBLAGES AND HOLOCENE DEPOSITS: SYDNEY HARBOUR'S MOLLUSCAN RECORD
Late Quaternary faulting history of the Carrizal and related faults, La Paz region, Baja California Sur, Mexico
STOWING AWAY ON SHIPS THAT PASS IN THE NIGHT: SCLEROBIONT ASSEMBLAGES ON INDIVIDUALLY DATED BIVALVE AND BRACHIOPOD SHELLS FROM A SUBTROPICAL SHELF
Amino acid ratios in reworked marine bivalve shells constrain Greenland Ice Sheet history during the Holocene
New data on the Pleistocene of Trani (Adriatic Coast, Southern Italy)
Sequence stratigraphy and the resolution of the fossil record
Pleistocene sequence stratigraphy of the shallow continental shelf, offshore New Jersey: Constraints of Integrated Ocean Drilling Program Leg 313 core holes
Quantitative comparisons and models of time-averaging in bivalve and brachiopod shell accumulations
Radiocarbon analyses of pollen, ostracodes, and total organic carbon (TOC) provide a reliable chronology for the sediments deposited in Bear Lake over the past 30,000 years. The differences in apparent age between TOC, pollen, and carbonate fractions are consistent and in accord with the origins of these fractions. Comparisons among different fractions indicate that pollen sample ages are the most reliable, at least for the past 15,000 years. The post-glacial radiocarbon data also agree with ages independently estimated from aspartic acid racemization in ostracodes. Ages in the red, siliclastic unit, inferred to be of last glacial age, appear to be several thousand years too old, probably because of a high proportion of reworked, refractory organic carbon in the pollen samples. Age-depth models for five piston cores and the Bear Lake drill core (BL00-1) were constructed by using two methods: quadratic equations and smooth cubic-spline fits. The two types of age models differ only in detail for individual cores, and each approach has its own advantages. Specific lithological horizons were dated in several cores and correlated among them, producing robust average ages for these horizons. The age of the correlated horizons in the red, siliclastic unit can be estimated from the age model for BL00-1, which is controlled by ages above and below the red, siliclastic unit. These ages were then transferred to the correlative horizons in the shorter piston cores, providing control for the sections of the age models in those cores in the red, siliclastic unit. These age models are the backbone for reconstructions of past environmental conditions in Bear Lake. In general, sedimentation rates in Bear Lake have been quite uniform, mostly between 0.3 and 0.8 mm yr ‒1 in the Holocene, and close to 0.5 mm yr ‒1 for the longer sedimentary record in the drill core from the deepest part of the lake.
Late Pleistocene lakes and wetlands, Panamint Valley, Inyo County, California
Pleistocene deposits in Panamint Valley, California, document the changes in pluvial lake level, source water, and elevation of the regional groundwater table associated with climate change. The oxygen isotope stage (OIS) 2 and 6 lacustrine record is well preserved in surficial deposits, whereas the OIS 3–5 lacustrine-paludal and lacustrine record is mainly derived from an archived core sample. Amino acid racemization ratios in ostracodes and gastropods suggest that the shoreline and groundwater-discharge features that lie between ∼600 and 550 m elevation formed during one highstand, probably during OIS 6. A fossiliferous part of the ∼100-m-deep core DH-1, which was drilled in the Ballarat Basin during the late 1950s, was resampled in this study. Comparison of DH-1 with core DH-3 from Panamint Valley and core OL-92 from Owens Lake suggests the 34–78-m-depth interval of DH-1 may span all or much of OIS 4. The microfauna from this depth interval indicate a saline marsh or shallow lacustrine environment, but not a large lake. The ostracode assemblage requires low ratios of alkalinity to calcium (alk/Ca) water likely indicative of solutes in deep regional groundwater sources rather than the high alk/Ca solutes common to the Owens River system. OIS 2–aged sediment from surficial deposits, a shallow auger hole, and core DH-1 contain faunas, including the ostracode Limnocythere sappaensis , which require the high alk/Ca evolved solutes common to the Owens River. The elevation of the lacustrine sediments further indicates a moderate-sized saline lake around 180–200 m depth. In the northern Lake Hill basin, a saline lake persisted until at least 16 ka, and it was succeeded by fresh, groundwater-supported wetlands, which were fully developed by ca. 12,575 14 C yr B.P. and which persisted until around 10,500 14 C yr B.P., when the basin became a dry playa.
Sediment mixing and stratigraphic disorder revealed by the age-structure of Tellina shells in Great Barrier Reef sediment
Carbonate Preservation in Shallow Marine Environments: Unexpected Role of Tropical Siliciclastics
Las Tablas de Daimiel, Spain, is one of the scarce, freshwater wetlands areas still preserved in southern Europe. The wetland is fed by surface and groundwater. We studied the Quaternary sedimentary record of Las Tablas in a drill hole that penetrated 38.5 m of shallow-lake and fluvial deposits. Differences in the dominantly micritic muds indicate three main stages of development. In the lowest stage, unit A, (Lower? to Middle Pleistocene) the slightly saline wetland developed under a relatively arid climate that favored slow flow movement of the fluvial system and the disconnection of the ponded areas. In the intermediate stage, unit B, (Middle to Upper Pleistocene) extensive peat developed during wetter conditions. Biosiliceous sediments (diatoms and sponge spicules) also accumulated in this swampy setting. In the latter stage, unit C, (Upper Pleistocene to Holocene) palustrine carbonates formed in a freshwater environment with desiccation events, followed by fluvial reworking of the lake margins. Lithification of these deposits was relatively fast (<10,000 yr). The studies of the core, including mineralogy, petrography, stables isotopes, and pollen analyses, indicate that these sediments are similar to those of ancient palustrine sequences. Therefore, Las Tablas can be considered as a recent analogue for freshwater palustrine systems that have no marine influence. These systems are very sensitive to changes in climate or base level, and their study is needed to better understand the terrestrial sedimentary record. Study is needed also to determine how to preserve these wetlands. Las Tablas de Daimiel constituyen uno de los escasos humedales de agua dulce que aún se conservan en el sur de Europa, concretamente en España. El humedal está abastecido por aguas superficiales y subterráneas. El registro sedimentario Cuaternario de Las Tablas, se ha estudiado mediante un sondeo en el que se cortaron 38.5 m de depósitos lacustres someros y fluviales, esencialmente carbonatos micríticos. Las características de los sedimentos permiten diferenciar tres principales etapas de sedimentación. En la primera etapa, unidad A, (Pleistoceno Inferior? a Medio) el humedal era ligeramente salino y se desarrolló bajo un clima relativamente árido que favoreció el flujo más lento del sistema fluvial, permitiendo la desconexión de las zonas encharcadas. En la etapa intermedia, unidad B, (Pleistoceno Medio a Superior) el amplio desarrollo de turberas indica condiciones más húmedas, en las que dentro de las áreas pantanosas también se depositaron sedimentos biosilíceos (diatomeas y espículas de esponjas). En la última etapa, unidad C, (Pleistoceno Superior a Holoceno) los sedimentos característicos son carbonatos palustres formados en un ambiente de agua dulce con eventos de desecación seguidos de posterior retrabajamiento de los márgenes lacustres por canales fluviales. La litificación de estos depósitos fue relativamente rápida (<10000 años). El estudio llevado a cabo en el sondeo (mineralogía, petrografía, isótopos estables, análisis polínicos) indica que estos sedimentos son similares a las secuencias palustres del registro geológico. Por tanto, Las Tablas de Daimiel pueden considerarse como un análogo reciente para sistemas palustres de agua dulce que no tengan influencia marina. Estos sistemas son muy sensibles a cambios climáticos y/o del nivel de base, por lo que su estudio es necesario para conocer mejor el registro sedimentario continental, pero también para preservar estos humedales.