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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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Ethiopia (1)
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Mozambique (1)
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Algeria
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Atlas Mountains
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Maghreb (2)
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Morocco
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High Atlas (6)
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Rif (2)
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Southern Africa
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Antarctica
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Ukraine
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Ukraine
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Western Europe
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Yorkshire England
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Scotland
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Graham Island (1)
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Indian Ocean
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Lusitanian Basin (7)
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North America
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Pacific Ocean
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North Pacific
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West Pacific
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polar regions (1)
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Queen Charlotte Sound (1)
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Russian Platform
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South America
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Argentina
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elements, isotopes
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boron
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carbon
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C-13/C-12 (44)
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organic carbon (12)
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chemical ratios (2)
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halogens
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iodine (1)
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isotope ratios (49)
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isotopes
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radioactive isotopes
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (44)
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N-15/N-14 (2)
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Nd-144/Nd-143 (1)
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O-18/O-16 (19)
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Os-188/Os-187 (4)
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Re-187/Os-188 (1)
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S-34/S-32 (3)
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Sr-87/Sr-86 (9)
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metals
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actinides
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uranium
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U-238/U-235 (1)
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alkaline earth metals
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calcium
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Mg/Ca (1)
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Sr/Ca (2)
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magnesium
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strontium
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rare earths
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neodymium
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rhenium
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Re-187/Os-188 (1)
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zinc (2)
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nitrogen
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N-15/N-14 (2)
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oxygen
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O-18/O-16 (19)
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phosphorus (1)
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Invertebrata
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Insecta (2)
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Brachiopoda
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Articulata
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Echinodermata
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Crinozoa
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Mollusca
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Cephalopoda
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Ammonites (19)
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Hildocerataceae
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Coleoidea
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Gastropoda (4)
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Porifera
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Protista
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Foraminifera
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Rotaliina
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Textulariina
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Lituolacea
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Radiolaria (4)
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microfossils
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Plantae
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Spermatophyta
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Glen Canyon Group (1)
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Bazhenov Formation (1)
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Lower Jurassic
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lower Liassic (15)
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middle Liassic (32)
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Nordegg Member (2)
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lower Toarcian (34)
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upper Liassic (139)
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Middle Jurassic
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Callovian (11)
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Precambrian
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Neoproterozoic (1)
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Paleoproterozoic
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Orosirian (1)
-
-
-
-
-
-
igneous rocks
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igneous rocks
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plutonic rocks
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diabase (2)
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granites (1)
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-
volcanic rocks
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andesites (1)
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basalts
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flood basalts (5)
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mid-ocean ridge basalts (1)
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pyroclastics
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ignimbrite (2)
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tuff (1)
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rhyolites (1)
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volcanic ash (1)
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metamorphic rocks
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turbidite (2)
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minerals
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phosphates
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apatite (1)
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (9)
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-
-
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sheet silicates
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chlorite group
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chlorite (2)
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clay minerals
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dickite (1)
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kaolinite (5)
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smectite (5)
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illite (3)
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mica group
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serpentine group
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berthierine (1)
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sulfates
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anhydrite (1)
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sulfides
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sphalerite (1)
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-
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Primary terms
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absolute age (14)
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Africa
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East Africa
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Ethiopia (1)
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Mozambique (1)
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Somali Republic (1)
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Lebombo Mountains (1)
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North Africa
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Algeria
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Atlas Mountains
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High Atlas (6)
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Maghreb (2)
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Morocco
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Rif (2)
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Tunisia (1)
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Southern Africa
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Antarctica
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Asia
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Far East
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Tomsk Russian Federation (5)
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Tyumen Russian Federation
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Yamal-Nenets Russian Federation
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Taz Basin (1)
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West Siberia
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Siberian Lowland (3)
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Atlantic Ocean
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North Atlantic
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Blake Plateau
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North Sea
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East Shetland Basin (1)
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Gullfaks Field (1)
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Statfjord Field (1)
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Viking Graben (1)
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Northeast Atlantic (1)
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Porcupine Basin (1)
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South Atlantic
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Walvis Ridge (1)
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Atlantic Ocean Islands
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Fuerteventura (1)
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atmosphere (1)
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bacteria (2)
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biogeography (24)
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bitumens (3)
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boron
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B-11/B-10 (1)
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Canada
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Arctic Archipelago (1)
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Nova Scotia
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Minas Basin (1)
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-
-
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Nunavut
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Ellesmere Island
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Fosheim Peninsula (1)
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Sverdrup Basin (4)
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Sverdrup Islands
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Axel Heiberg Island (2)
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-
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Queen Elizabeth Islands
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Ellesmere Island
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Fosheim Peninsula (1)
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Sverdrup Basin (4)
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Sverdrup Islands
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Axel Heiberg Island (2)
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Stikinia Terrane (3)
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Western Canada
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Alberta
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Peace River Arch (1)
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British Columbia
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Bowser Basin (1)
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Queen Charlotte Islands (3)
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Canadian Cordillera (4)
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Yukon Territory (2)
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carbon
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C-13/C-12 (44)
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organic carbon (12)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene
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Roman period (1)
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Tertiary
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Neogene
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Miocene
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Paleogene
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lower Eocene (2)
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Oligocene (1)
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Paleocene
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lower Paleocene
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Danian (1)
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K-T boundary (1)
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upper Paleocene (2)
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Paleocene-Eocene Thermal Maximum (2)
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Chordata
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Vertebrata
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Pisces
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Chondrichthyes
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Elasmobranchii (1)
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Osteichthyes
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Actinopterygii
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Tetrapoda
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Amniota (2)
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Reptilia
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Anapsida (1)
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Diapsida
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Archosauria
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Crocodilia
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dinosaurs
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Ornithischia (2)
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Saurischia
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Sauropodomorpha (1)
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Theropoda (1)
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-
-
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Ichthyosauria
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Ichthyosaurus (2)
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Sauropterygia
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Plesiosauria (6)
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-
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Synapsida
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Therapsida
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Cynodontia (1)
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clay mineralogy (5)
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climate change (19)
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continental drift (1)
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continental slope (1)
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crust (2)
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crystal chemistry (1)
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data processing (5)
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Deep Sea Drilling Project
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IPOD
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Leg 74
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DSDP Site 527 (1)
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DSDP Site 528 (1)
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deformation (1)
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diagenesis (14)
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energy sources (3)
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epeirogeny (1)
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Eurasia (1)
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Europe
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Alps
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French Alps (2)
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Western Alps
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Dauphine Alps
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Baltic region (1)
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Caucasus (1)
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Central Europe
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Germany
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Baden-Wurttemberg Germany
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Holzmaden region (5)
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Lower Saxony Germany (2)
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Mecklenburg-Western Pomerania Germany (2)
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Schleswig-Holstein Germany (2)
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Hungary
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Transdanubia (1)
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Slovakia (1)
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Fennoscandia (1)
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Southern Europe
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Greece
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Epirus Greece (1)
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Hellenides (1)
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Iberian Peninsula
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Portugal
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Coimbra Portugal (1)
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Spain
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Teruel Spain (1)
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Asturias Spain (1)
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Basque Provinces Spain (2)
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Betic Zone (1)
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Cantabria Spain (1)
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Cantabrian Basin (3)
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Catalonia Spain (2)
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Iberian Mountains (5)
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Murcia Spain (1)
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Subbetic Zone (2)
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-
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Italy
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Apennines
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Central Apennines (1)
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Northern Apennines (1)
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Southern Apennines (1)
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Basilicata Italy
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Marches Italy (6)
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Umbria Italy
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Perugia Italy (1)
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Terni Italy (1)
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Veneto Italy
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Belluno Italy (1)
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Slovenia (1)
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Vardar Zone (1)
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Ukraine
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Boltyshka Depression (1)
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Ukrainian Shield (1)
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Western Europe
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France
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Alpes-de-Haute Provence France
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Digne France (1)
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Aquitaine Basin (1)
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Aveyron France (3)
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Burgundy (1)
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Causses (2)
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Cher France (1)
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Dauphine Alps
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Belledonne Massif (1)
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Pelvoux Massif (1)
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French Alps (2)
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Hautes-Alpes France (1)
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Herault France (1)
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Isere France (2)
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Paris Basin (3)
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Quercy (4)
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Rhone France (1)
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Tarn France (2)
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Tarn-et-Garonne France (1)
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Luxembourg (2)
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Netherlands (1)
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Scandinavia
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Denmark (2)
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United Kingdom
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Great Britain
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England
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Dorset England (5)
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East Midlands (1)
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Gloucestershire England (1)
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London Basin (1)
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Somerset England
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Mendip Hills (1)
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Sussex England (1)
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Wessex Basin (3)
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Yorkshire England
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North Yorkshire England (8)
-
-
-
Scotland
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Hebrides
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Inner Hebrides (1)
-
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Moray Firth (1)
-
-
Wales
-
Gwynedd Wales (1)
-
-
-
-
-
-
faults (9)
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folds (3)
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fractures (2)
-
geochemistry (28)
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geochronology (2)
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geophysical methods (5)
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glacial geology (1)
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government agencies
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survey organizations (1)
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ground water (1)
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heat flow (1)
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hydrology (1)
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ichnofossils
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Arenicolites (1)
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Chondrites ichnofossils (1)
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Diplocraterion (1)
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Ophiomorpha (1)
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Thalassinoides (1)
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Zoophycos (1)
-
-
igneous rocks
-
plutonic rocks
-
diabase (2)
-
granites (1)
-
-
volcanic rocks
-
andesites (1)
-
basalts
-
flood basalts (5)
-
mid-ocean ridge basalts (1)
-
-
pyroclastics
-
ignimbrite (2)
-
tuff (1)
-
-
rhyolites (1)
-
-
-
inclusions
-
fluid inclusions (1)
-
-
Indian Ocean
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Arabian Sea
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Persian Gulf (1)
-
-
-
intrusions (3)
-
Invertebrata
-
Arthropoda
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Mandibulata
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Crustacea
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Malacostraca (1)
-
Ostracoda
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Podocopida
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Cytherocopina
-
Cytheracea (1)
-
-
-
-
-
Insecta (2)
-
-
-
Brachiopoda
-
Articulata
-
Rhynchonellida
-
Rhynchonellidae (2)
-
-
-
-
Bryozoa (1)
-
Cnidaria
-
Anthozoa (3)
-
-
Echinodermata
-
Asterozoa
-
Stelleroidea
-
Ophiuroidea (2)
-
-
-
Crinozoa
-
Crinoidea (2)
-
-
Echinozoa
-
Echinoidea (2)
-
-
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Rudistae (1)
-
-
Ostreoidea
-
Ostreidae
-
Ostrea (1)
-
-
-
Pterioida
-
Pteriina
-
Pectinacea
-
Pectinidae (1)
-
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (19)
-
Bouleiceras (1)
-
Dactylioceratidae (2)
-
Hildocerataceae
-
Hildoceratidae (4)
-
-
-
Coleoidea
-
Belemnoidea
-
Belemnitidae (8)
-
-
-
Nautiloidea
-
Nautilus (1)
-
-
-
Gastropoda (4)
-
-
Porifera
-
Hexactinellida (1)
-
-
Protista
-
Foraminifera
-
Rotaliina
-
Nodosariacea
-
Nodosariidae
-
Nodosaria (1)
-
-
-
-
Textulariina
-
Ammodiscacea
-
Ammodiscidae (1)
-
Astrorhizidae (1)
-
-
Lituolacea
-
Ammobaculites (1)
-
Lituolidae
-
Haplophragmoides (1)
-
-
-
-
-
Radiolaria (4)
-
-
-
isotopes
-
radioactive isotopes
-
Re-187/Os-188 (1)
-
U-238/U-235 (1)
-
-
stable isotopes
-
B-11/B-10 (1)
-
C-13/C-12 (44)
-
N-15/N-14 (2)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (19)
-
Os-188/Os-187 (4)
-
Re-187/Os-188 (1)
-
S-34/S-32 (3)
-
Sr-87/Sr-86 (9)
-
-
-
lava (2)
-
Mediterranean region (3)
-
Mesozoic
-
Cretaceous
-
Hue Shale (1)
-
Lower Cretaceous
-
Albian (4)
-
Aptian
-
lower Aptian (1)
-
-
Barremian (1)
-
Berriasian (1)
-
Christopher Formation (1)
-
Valanginian (3)
-
-
Upper Cretaceous
-
Campanian (1)
-
Cenomanian (4)
-
Kanguk Formation (1)
-
K-T boundary (1)
-
Turonian (3)
-
-
-
Glen Canyon Group (1)
-
Jurassic
-
Bazhenov Formation (1)
-
Clarens Formation (3)
-
Fernie Formation (5)
-
Ferrar Group (5)
-
Heather Formation (1)
-
Lower Jurassic
-
Domerian (4)
-
Dunlin Group (1)
-
Hettangian (15)
-
lower Liassic (15)
-
middle Liassic (32)
-
Nordegg Member (2)
-
Pliensbachian (68)
-
Sinemurian (16)
-
Toarcian
-
lower Toarcian (34)
-
-
upper Liassic (139)
-
-
Middle Jurassic
-
Aalenian (26)
-
Bajocian
-
Brent Group (1)
-
Ness Formation (1)
-
Tarbert Formation (1)
-
Yakoun Group (1)
-
-
Bathonian
-
Great Oolite Group (2)
-
-
Callovian (11)
-
Dogger (6)
-
Xishanyao Formation (1)
-
-
Oxford Clay (1)
-
Posidonia Shale (11)
-
San Rafael Group (1)
-
Upper Jurassic
-
Arab Formation (1)
-
Bowser Lake Group (1)
-
Hanifa Formation (1)
-
Kimmeridge Clay (3)
-
Kimmeridgian (6)
-
Oxfordian (7)
-
Portlandian (5)
-
Tithonian (4)
-
Volgian (2)
-
-
-
lower Mesozoic (1)
-
Newark Supergroup (1)
-
Triassic
-
Middle Triassic
-
Ladinian (1)
-
-
Upper Triassic
-
Carnian (5)
-
Chinle Formation (1)
-
Keuper (2)
-
Norian (4)
-
Rhaetian (6)
-
Stormberg Series (2)
-
-
-
-
metal ores
-
lead ores (1)
-
lead-zinc deposits (1)
-
manganese ores (1)
-
zinc ores (1)
-
-
metals
-
actinides
-
uranium
-
U-238/U-235 (1)
-
-
-
alkaline earth metals
-
calcium
-
Mg/Ca (1)
-
Sr/Ca (2)
-
-
magnesium
-
Mg/Ca (1)
-
-
strontium
-
Sr/Ca (2)
-
Sr-87/Sr-86 (9)
-
-
-
aluminum (1)
-
cadmium (1)
-
lead (1)
-
manganese (2)
-
mercury (1)
-
molybdenum (4)
-
platinum group
-
osmium
-
Os-188/Os-187 (4)
-
Re-187/Os-188 (1)
-
-
-
rare earths
-
europium (1)
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
rhenium
-
Re-187/Os-188 (1)
-
-
zinc (2)
-
-
metamorphic rocks
-
quartzites (1)
-
schists (1)
-
-
Mexico
-
Chihuahua Mexico (1)
-
Sonora Mexico (2)
-
-
mineral deposits, genesis (1)
-
minerals (1)
-
nitrogen
-
N-15/N-14 (2)
-
-
North America
-
North American Cordillera
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Canadian Cordillera (4)
-
-
Rocky Mountains
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Canadian Rocky Mountains (1)
-
-
Western Canada Sedimentary Basin (1)
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Western Interior (1)
-
-
ocean basins (1)
-
ocean circulation (1)
-
Ocean Drilling Program
-
Leg 171B
-
ODP Site 1049 (1)
-
-
-
ocean floors (1)
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oil and gas fields (1)
-
orogeny (3)
-
oxygen
-
O-18/O-16 (19)
-
-
Pacific Coast (1)
-
Pacific Ocean
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East Pacific
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East Pacific Rise (1)
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Northeast Pacific (1)
-
-
North Pacific
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Northeast Pacific (1)
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Northwest Pacific
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Japan Sea
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Japan Basin (1)
-
-
-
-
West Pacific
-
Northwest Pacific
-
Japan Sea
-
Japan Basin (1)
-
-
-
-
-
paleobotany (2)
-
paleoclimatology (24)
-
paleoecology (45)
-
paleogeography (42)
-
paleomagnetism (5)
-
paleontology (12)
-
Paleozoic
-
Devonian
-
Lower Devonian (1)
-
Upper Devonian
-
Kellwasser event (1)
-
-
-
Permian
-
Guadalupian
-
Capitanian (1)
-
-
Upper Permian
-
Zechstein (1)
-
-
-
-
palynology (3)
-
palynomorphs
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acritarchs (2)
-
Dinoflagellata (14)
-
miospores
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Classopollis (1)
-
pollen (3)
-
-
-
paragenesis (1)
-
petroleum
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natural gas (2)
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-
petrology (1)
-
phosphorus (1)
-
Plantae
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algae
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Chlorophyta
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Botryococcus (1)
-
-
Coccolithophoraceae (4)
-
nannofossils (10)
-
Pyrrhophyta (1)
-
Rhodophyta
-
Corallinaceae (1)
-
-
-
Spermatophyta
-
Gymnospermae
-
Coniferae (1)
-
Coniferales
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Cupressaceae (1)
-
-
Ginkgoales (1)
-
-
-
-
plate tectonics (7)
-
pollution (1)
-
Precambrian
-
Archean
-
Neoarchean (1)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Stenian (1)
-
-
Neoproterozoic (1)
-
Paleoproterozoic
-
Orosirian (1)
-
-
-
-
-
reefs (1)
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remote sensing (1)
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rock mechanics (2)
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sea water (3)
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sea-floor spreading (1)
-
sea-level changes (26)
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sedimentary petrology (6)
-
sedimentary rocks
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carbonate rocks
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chalk (1)
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dolostone (1)
-
grainstone (1)
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Toarcian
The timing and duration of large-scale carbon release in the Early Jurassic Available to Purchase
EARLY JURASSIC BENTHIC FORAMINIFERAL ECOLOGY FROM THE CENTRAL HIGH ATLAS MOUNTAINS, MOROCCO Available to Purchase
A thermophilous and arid-tolerant flora from the Lower Jurassic of the Junggar Basin, Xinjiang, NW China, corresponding to the Toarcian Oceanic Anoxic Event Available to Purchase
Abstract Twenty taxa of fossil plants are described from the Sangonghe Formation (Lower Jurassic) of the Haojiagou section in the Junggar Basin, Xinjiang, NW China. The Sangonghe flora consists of Equisetales, ferns, bennettitaleans, ginkgoes, conifers and gnetales, but is dominated by ferns. It is a low-species-diversity but extraordinary flora as it has a high proportion (45%) of thermophilous or arid-tolerant (xerophilous) elements, in comparison to 0% in the underlying Badaowan Formation and c. 2% in the overlying Xishanyao Formation. These thermophilous or arid-tolerant (xerophilous) elements include Marattiopsis asiatica Kawasaki, Phlebopteris polypodioides Brongniart and Dictyophyllum sp. (ferns), Otozamites leckenbyi Harris, Otozamites sp., Zamites sp. and Dictyozamites sp. (bennettitaleans), Brachyphyllum (Hirmeriella ?) sp. (conifers) and Cadmisega ephedroides Krassilov and Bugdaeva (gnetales). Based on the geological ranges of the known species and comparisons with coeval floras in Eurasia, the age of the Sangonghe flora is Toarcian (Early Jurassic). The flora reveals a climatic warming and aridification event that occurred during the Toarcian in the Junggar Basin. Palaeontological (including palaeobotanical and palynological), sedimentological and geochemical data demonstrate that warming and aridification occurred widely across the north of China during the Toarcian, and that this might be the response of the terrestrial ecosystem to the Toarcian Oceanic Anoxic Event.
Death by ammonite: fatal ingestion of an ammonoid shell by an Early Jurassic bony fish Open Access
Chapter 3. Sequence stratigraphy scheme for the Lower Jurassic of the North Sea area Available to Purchase
Abstract This chapter describes Lower Jurassic second-order sequences J00 and J10, and their component third-order sequences J1–J6 and J12–J18. Two sequences (J1 and J3) are new, four sequences (J2, J4, J12 and J16) are amended and one sequence (J17) is renamed. A significant unconformity at the base of the J12 sequence (Upper Sinemurian) is present near the base of the Dunlin Group in the North Viking Graben–East Shetland Platform and in the Danish Central Graben, and correlates with an equivalent unconformity around the margins of the London Platform, onshore UK. A marked unconformity at the base of the J16 sequence is recognized in the North Viking Graben and onshore UK, where it is related to structural movements on the Market Weighton High, eastern England. Several levels of carbon enrichment (carbon isotope excursions (CIEs)) and associated geochemical changes tie to J sequences defining maximum flooding surfaces: the Upper Sinemurian CIE equates to the base J6 maximum flooding surface (MFS), the basal Pliensbachian CIE ties to the base J13 MFS, the basal Toarcian CIE relates to the base J17 MFS and the Toarcian Ocean Anoxic Event corresponds with the base J18 MFS.
Chapter 4. Sequence stratigraphy scheme for the Middle Jurassic of the North Sea area Available to Purchase
Abstract This chapter describes Middle Jurassic second-order sequences J20 and J30, and their component third-order sequences, J22–J26 and J32–J36. The J22 sequence contains the major Intra-Aalenian Unconformity (‘Mid-Cimmerian’) across a wide area of the North Sea Basin and an equivalent event onshore UK. The base J24 (Lower Bajocian) is marked by the Rannoch Shale (Brent Group) and by the flooding of the Ollach Sandstone, Hebrides Basin. The base J26 (Upper Bajocian) ties to the Mid Ness Shale (Brent Group) and the base of the Upper Trigonia Grit Member, central England. The base J32 (Upper Bajocian) ties to the base of the Tarbert Formation, the base of the Great Oolite Group in central England and the base of the Great Estuarine Group, Hebrides Basin. The base J33 (Middle Bathonian) falls within the Tarbert Formation and the base of the Taynton Limestone, central England. The base J34 (uppermost Middle Bathonian) commonly falls at the top of the Brent Group. The base J36 (uppermost Bathonian) represents a major increase in marine influence, at the base of the Beatrice Formation, in the Inner Moray Firth and at the base of the Staffin Bay Formation, Hebrides Basin.
Collapse of terrestrial ecosystems linked to heavy metal poisoning during the Toarcian oceanic anoxic event Available to Purchase
Long duration of benthic ecological recovery from the early Toarcian (Early Jurassic) mass extinction event in the Cleveland Basin, UK Open Access
Life and land engulfed in the late Early Jurassic Karoo lavas of southern Gondwana Open Access
The Prisayan Formation (Lower and Middle Jurassic) of the Irkutsk Coal Basin: New Data on Litho- and Phytostratigraphy Available to Purchase
A new subsurface record of the Pliensbachian–Toarcian, Lower Jurassic, of Yorkshire Open Access
The last representatives of the Superfamily Wellerelloidea (Brachiopoda, Rhynchonellida) in the westernmost Tethys (Iberian paleomargins) prior to their demise in the early Toarcian Mass Extinction Event Open Access
Anatomy of a platform margin during a carbonate factory collapse: implications for the sedimentary record and sequence stratigraphic interpretation of poisoning events Available to Purchase
The Jurassic structural high of Sasso di Pale (Umbria-Marche Basin, Italy): How a small Apennine structure recorded Early to Middle Jurassic global perturbations Available to Purchase
ABSTRACT The reduced Jurassic sedimentary sequences deposited on a structural high in the Umbria-Marche Apennines, as well their relationships with adjacent expanded basinal sequences, have been reconstructed through detailed, interdisciplinary study of the Sasso di Pale and Monte Serrone areas near Foligno, Italy. The physiographic features of the basin originated in the Early Jurassic (latest early Pliensbachian), when extensional tectonic activity broke up a shallow water platform where the Calcare Massiccio had been deposited, and the area evolved from an edge-stepped structural high to a distally steepened ramp. The biostratigraphic framework of this paper is mainly based on calcareous nannofossils, which are a useful tool for dating condensed Jurassic successions. Although the sections studied have limited thickness and much lateral facies variation, the sedimentary evolution can be traced and interpreted within a wider Jurassic environmental perspective. In the upper Pliensbachian–lower Bajocian interval, local sea-level variations are compatible with the global sea-level curve. Furthermore, some of the characteristic events—such as the Pliensbachian–Toarcian crisis, the Early Toarcian Jenkyns Event, and the Middle Jurassic carbonate crisis—can be recognized. The present study shows how the reconstruction of local paleogeography can fit into a more general framework and how regional and global signals can be recognized even in a small structural high such as the one we have investigated.
Fracture stratigraphy of Mesozoic platform carbonates, Agri Valley, southern Italy Available to Purchase
In-situ Aptychus in Cleviceras from the Mulgrave Shale Member of the Whitby Mudstone Formation (Jurassic) of Port Mulgrave, Whitby Available to Purchase
No effect of thermal maturity on the Mo, U, Cd, and Zn isotope compositions of Lower Jurassic organic-rich sediments Open Access
Paleo–Pacific plate subduction on the eastern Asian margin: Insights from the Jurassic foreland system of the overriding plate Available to Purchase
The Toarcian Oceanic Anoxic Event: where do we stand? Open Access
Abstract The study of past climate changes is pivotal for understanding the complex biogeochemical interactions through time between the geosphere, atmosphere, hydrosphere and biosphere, which are critical for predicting future global changes. The Toarcian Oceanic Anoxic Event, also known as the Jenkyns Event, was a hyperthermal episode that occurred during the early Toarcian (c. 183 Ma; Early Jurassic) and resulted in numerous collateral effects including global warming, enhanced weathering, sea-level change, carbonate crisis, marine anoxia–dysoxia and biotic crisis. The IGCP-655 project of the IUGS–UNESCO has constituted an international network of researchers with different disciplinary skills who have collaborated and shared conceptual advances on uncovering drivers of the environmental changes and ecosystem responses. This volume, Carbon Cycle and Ecosystem Response to the Jenkyns Event in the Early Toarcian (Jurassic) , presents 16 works that investigate the early Toarcian environmental changes related to the global warming, sea-level rise, carbon cycle perturbation and second-order mass extinction through biostratigraphy, micropalaeontology, palaeontology, ichnology, palaeoecology, sedimentology, integrated stratigraphy, inorganic, organic and isotopic geochemistry, and cyclostratigraphy.
The effects of the Jenkyns Event on the radiation of Early Jurassic dinoflagellate cysts Available to Purchase
Abstract This contribution is an overview of the Early Jurassic dinoflagellate cysts of the Lusitanian Basin in Portugal, with particular emphasis on the effects of the Jenkyns Event (Toarcian Oceanic Anoxic Event) on the evolution of this planktonic group. We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemurian to upper Toarcian) in the Lusitanian Basin. The late Pliensbachian radiation of dinoflagellate cysts was well recognized in this basin. The pre-Jenkyns Event interval is highly productive, with maximum abundance and species richness values. However, this palaeoenvironmental perturbation severely affected the evolution of this group for the remainder of the Early Jurassic. The prolonged recovery of the dinoflagellates in the Toarcian following the Jenkyns Event is not typical of the northern regions (Arctic and Boreal realms), where new species began to evolve earlier compared with southern European basins.