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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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Central Africa (1)
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Chad Basin (1)
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North Africa
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Morocco (1)
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West Africa
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Chad (1)
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Asia
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Far East
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Mongolia (1)
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Thailand (1)
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Siberia (1)
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Atlantic Ocean (1)
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Australasia
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Australia
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Officer Basin (1)
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Central America (1)
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Europe
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Central Europe
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Austria
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Styria Austria
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Graz Austria (1)
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Hungary (1)
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Switzerland
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Bern Switzerland (1)
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Swiss Jura Mountains (1)
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Jura Mountains
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Western Europe
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France
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North America (1)
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South America
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Bolivia (1)
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elements, isotopes
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carbon
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C-13/C-12 (5)
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hydrogen
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D/H (3)
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isotope ratios (12)
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isotopes
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stable isotopes
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D/H (3)
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N-15/N-14 (1)
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O-18/O-16 (10)
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S-34/S-32 (2)
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nitrogen
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N-15/N-14 (1)
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oxygen
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O-18/O-16 (10)
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sulfur
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S-34/S-32 (2)
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fossils
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Chordata
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Vertebrata
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Pisces (1)
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Amblypoda
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Pantodonta (1)
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Rodentia (1)
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Reptilia
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Diapsida
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Archosauria
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dinosaurs
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Invertebrata
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minerals
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chlorides
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phosphates
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apatite (2)
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Primary terms
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Africa
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Central Africa (1)
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Chad Basin (1)
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North Africa
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Morocco (1)
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West Africa
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Chad (1)
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Asia
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Far East
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Mongolia (1)
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Thailand (1)
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Siberia (1)
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Atlantic Ocean (1)
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Australasia
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Australia
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Officer Basin (1)
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carbon
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C-13/C-12 (5)
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Cenozoic
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Quaternary
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Holocene (1)
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Tertiary
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Neogene
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Miocene
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middle Miocene (1)
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Sarmatian (1)
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upper Miocene
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Messinian (1)
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Pliocene
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lower Pliocene (1)
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Paleogene
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Eocene
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lower Eocene
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Ypresian (1)
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Oligocene (1)
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Central America (1)
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Chordata
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Vertebrata
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Pisces (1)
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Amblypoda
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Pantodonta (1)
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Rodentia (1)
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Reptilia
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Anapsida
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Testudines (1)
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Diapsida
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Archosauria
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dinosaurs
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Saurischia
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Theropoda
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Coelurosauria
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Tyrannosauridae (1)
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climate change (3)
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crust (1)
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diagenesis (2)
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ecology (1)
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Europe
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Central Europe
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Austria
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Styria Austria
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Graz Austria (1)
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Hungary (1)
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Switzerland
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Bern Switzerland (1)
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Swiss Jura Mountains (1)
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-
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Jura Mountains
-
Swiss Jura Mountains (1)
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Western Europe
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France
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Central Massif (1)
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Charente France (1)
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Limagne (1)
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Paris Basin (1)
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geochemistry (5)
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hydrogen
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D/H (3)
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hydrology (2)
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inclusions
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fluid inclusions (2)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Mollusca
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Gastropoda (1)
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Protista
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Foraminifera (1)
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-
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isotopes
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stable isotopes
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C-13/C-12 (5)
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D/H (3)
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N-15/N-14 (1)
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O-18/O-16 (10)
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S-34/S-32 (2)
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-
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Berriasian (1)
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Upper Cretaceous (1)
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Jurassic
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Middle Jurassic
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Bajocian (1)
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Upper Jurassic
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Kimmeridgian (1)
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Oxfordian (1)
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metasomatism (1)
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nitrogen
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N-15/N-14 (1)
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North America (1)
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oxygen
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O-18/O-16 (10)
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paleoclimatology (3)
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paleomagnetism (1)
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palynomorphs (1)
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Plantae
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algae (1)
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Precambrian
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upper Precambrian
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Proterozoic
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sea water (1)
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sedimentary petrology (1)
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sedimentary rocks
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carbonate rocks
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limestone
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micrite (1)
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sedimentary structures
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biogenic structures (1)
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sedimentation (1)
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sulfur
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S-34/S-32 (2)
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thallophytes (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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limestone
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micrite (1)
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sedimentary structures
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sedimentary structures
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biogenic structures (1)
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soils
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soils (1)
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Combined paleohistological and isotopic inferences of thermometabolism in extinct Neosuchia, using Goniopholis and Dyrosaurus (Pseudosuchia: Crocodylomorpha) as case studies
Abstract δ 2 H and δ 18 O values of precipitations follow an empirical linear relationship at the global scale that is called the Global Meteoric Water Line (GMWL) and characterized by a slope of 8. However, Local Meteoric Water Lines (LMWLs) may have different slopes S depending on their geographic situation. Monthly δ 2 H and δ 18 O of precipitation have been compiled from European International Atomic Energy Agency (IAEA) stations. Those data allowed the calculation of the slopes S of the δ 2 H– δ 18 O LMWL determined for each station. S increases with longitude ϕ from c. 5 (Portugal) to c. 9 (Russia) – they are positively correlated with relative humidity (RH), negatively with temperature and positively with the mean intra-annual amplitude of temperatures, which is a proxy of continentality. Slopes of 5–6, recorded in SW Europe, reflect mean RH (70–75%) and sea surface temperatures ( c. 25°C) of the Central Atlantic Ocean where the main flux of moisture is formed before being transported by the westerlies. In addition, falling water droplets within an air column with a high RH (>80%) and low temperature are expected to escape sub-cloud evaporation. Therefore, slopes with values close to 9 are considered to reflect isotopic equilibrium conditions during the condensation of water vapour in clouds.
Abstract For the first time, we present a decadal-scale stable isotope record (δ 18 O, δ 13 C) of 67 speleothem calcite samples coming from an artificial tunnel network located in Graz, Austria. Stable isotope data are interpreted with the help of time series (TS) analysis of mean air temperatures (MAT) and mean annual precipitations (MAP) that have been monitored and recorded in a neighbouring meteorological station. Speleothem records have proved to be very useful in reconstructing changes of environmental conditions. For studied stalagmites, which grew between 1945 and 2018, the δ 18 O values average −18.64‰ and range from −23‰ to −17‰ (VPDB, Vienna Pee Dee Belemnite), suggesting variable climatic conditions. The δ 18 O values of calcite increase along the growth axis and are correlated with high temporal resolution MAT, MAP and weighted mean annual δ 18 O of precipitations. For the same time interval, while the temperature TS show an increasing trend, with a steeper gradient since the 1980s, the precipitation TS presents a weak decreasing tendency. Increase in the δ 13 C values of speleothems from −33‰ to −24‰ (VPDB) is correlated with increasing temperature and drought, associated CO 2 degassing and soil erosion over the tunnel system.
Environmental changes around the Oligocene/Miocene boundary in the Limagne graben, Massif Central, France
Seawater residence times of some elements of geochemical interest and the salinity of the oceans
Paradigm shift in determining Neoproterozoic atmospheric oxygen
PRELIMINARY INVESTIGATION OF SEASONAL PATTERNS RECORDED IN THE OXYGEN ISOTOPE COMPOSITIONS OF THEROPOD DINOSAUR TOOTH ENAMEL
Origin of Micropores In Late Jurassic (Oxfordian) Micrites of the Eastern Paris Basin, France
Duration of the Early Bajocian and the associated δ 13 C positive excursion based on cyclostratigraphy
Freshwater fish δ 18 O indicates a Messinian change of the precipitation regime in Central Africa
Carbon- and oxygen-isotope records of palaeoenvironmental and carbonate production changes in shallow-marine carbonates (Kimmeridgian, Swiss Jura)
Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods
Palaeoenvironmental reconstruction of the Sarmatian (Middle Miocene) Central Paratethys based on palaeontological and geochemical analyses of foraminifera, ostracods, gastropods and rodents
Abstract Phosphatic remains (tooth enamel, turtle shell fragments and fish scales) of continental vertebrates (freshwater fish, crocodilians, turtles, and theropod and sauropod dinosaurs) recovered from eight localities of NE Thailand ranging in age from the Late Jurassic to the late Early Cretaceous have been analysed for their oxygen isotopic compositions (δ 18 O p ). From these preliminary data, local meteoric water δ 18 O w values estimated using δ 18 O p values of crocodilians and turtles range from −4.1±2‰ at the end of the Jurassic to −8.3±2‰ during the Early Cretaceous, suggesting a transition from dry to wetter climates with increasing amount of seasonal precipitation from several hundred millimetres per year to several thousand millimetres. Measurable offsets in δ 18 O p values observed between dinosaur taxa (the spinosaurid theropod Siamosaurus , other theropods and nemegtosaurid sauropods) are interpreted in terms of differences in water strategies, and suggest that Siamosaurus had habits similar to those of semi-aquatic vertebrates such as crocodilians or freshwater turtles.