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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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Nile Valley (2)
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North Africa
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Egypt (2)
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Morocco (3)
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Tunisia
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Sahel (1)
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South Africa
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Arctic Ocean
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Asia
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Far East
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China
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Canada
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Italy
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Highland region Scotland
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Mediterranean region (2)
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Mexico
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North America
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Pacific Ocean
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United States
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Alabama
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California
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chemical ratios (1)
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isotopes
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stable isotopes
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nitrogen (1)
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oxygen
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O-18/O-16 (7)
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sulfur
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fossils
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Graptolithina
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Didymograptina
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ichnofossils (5)
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Invertebrata
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Cephalopoda
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prokaryotes (1)
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geologic age
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Tertiary
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upper Miocene
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Pliocene (2)
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Paleogene
-
Duchesne River Formation (1)
-
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-
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middle Eocene
-
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upper Eocene
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Priabonian (2)
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Ilerdian (1)
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Oligocene
-
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upper Oligocene
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Paleocene
-
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Danian (1)
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middle Paleocene
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Ravenscrag Formation (1)
-
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Landenian (1)
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Wasatch Formation (1)
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-
upper Cenozoic (1)
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Mesozoic
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Cretaceous
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Albian (2)
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-
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-
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-
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-
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-
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Upper Cretaceous
-
Bridge Creek Limestone Member (2)
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Campanian (4)
-
Cenomanian
-
upper Cenomanian (1)
-
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Coniacian (1)
-
Fox Hills Formation (1)
-
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-
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-
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Jurassic
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Fernie Formation (2)
-
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Permian-Triassic boundary (5)
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-
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Paleozoic
-
Bird Spring Formation (1)
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-
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Carboniferous
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-
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-
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-
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-
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Tournaisian (2)
-
-
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-
Visean
-
upper Visean (1)
-
-
-
Upper Mississippian
-
Meramecian
-
Warsaw Formation (2)
-
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Serpukhovian (2)
-
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Namurian (1)
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-
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-
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Virgilian
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Wabaunsee Group (1)
-
-
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-
Upper Carboniferous
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Westphalian (1)
-
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Cow Head Group (1)
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-
-
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Permian
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-
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Lower Permian
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-
-
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Middle Permian (1)
-
Upper Permian
-
Lopingian
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-
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Permian-Triassic boundary (5)
-
-
-
Silurian
-
Lower Silurian
-
Llandovery (3)
-
Wenlock (2)
-
-
Upper Silurian
-
Ludlow (2)
-
-
-
-
Precambrian
-
Changzhougou Formation (1)
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic
-
Dengying Formation (1)
-
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-
Vendian (1)
-
-
Paleoproterozoic (1)
-
Sinian
-
Dengying Formation (1)
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-
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Primary terms
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Africa
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Cenozoic
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Tertiary
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Oligocene
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Paleocene
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hydrogen (1)
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Invertebrata
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Brachiopoda (3)
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Mollusca
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Cephalopoda
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Porifera (1)
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isotopes
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C-13/C-12 (15)
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lava (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (2)
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Upper Cretaceous
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Bridge Creek Limestone Member (2)
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Campanian (4)
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Coniacian (1)
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Fox Hills Formation (1)
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Turonian
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Jurassic
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Fernie Formation (2)
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Lower Jurassic
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Nordegg Member (1)
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Middle Jurassic
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Upper Jurassic
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Kimmeridgian (2)
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lower Mesozoic (1)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (5)
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Upper Triassic
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Carnian (2)
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metal ores (1)
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Sr-87/Sr-86 (5)
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Mexico
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North America
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O-18/O-16 (7)
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Pacific Ocean
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West Pacific
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Paleozoic
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Bird Spring Formation (1)
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Cambrian
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Lower Cambrian
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Terreneuvian
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Tommotian (4)
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Middle Cambrian (3)
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Upper Cambrian
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Steptoean (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (2)
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Middle Carboniferous (3)
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Mississippian
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Lower Mississippian
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Osagian
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Keokuk Limestone (2)
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Tournaisian (2)
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Middle Mississippian
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Visean
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upper Visean (1)
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Upper Mississippian
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Meramecian
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Warsaw Formation (2)
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Serpukhovian (2)
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Namurian (1)
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Pennsylvanian
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Lower Pennsylvanian
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Bashkirian (1)
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Upper Pennsylvanian
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Gzhelian (1)
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Virgilian
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Douglas Group (1)
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Wabaunsee Group (1)
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Upper Carboniferous
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Westphalian (1)
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Cow Head Group (1)
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Devonian
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Lower Devonian (2)
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Middle Devonian
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Givetian (2)
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Upper Devonian
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Famennian (1)
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Ordovician
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Antelope Valley Limestone (1)
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Lower Ordovician
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Middle Ordovician
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Whiterockian (2)
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Miramichi Group (1)
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Skiddaw Slates (1)
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Tetagouche Group (1)
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Upper Ordovician
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Ashgillian (1)
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Permian
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Guadalupian
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Wordian (1)
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Lower Permian
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Cisuralian
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Artinskian (3)
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Sakmarian (2)
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Middle Permian (1)
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Upper Permian
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Lopingian
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Changhsingian (1)
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Wuchiapingian (1)
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Permian-Triassic boundary (5)
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Silurian
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Lower Silurian
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Llandovery (3)
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Wenlock (2)
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Upper Silurian
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Ludlow (2)
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palynomorphs
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Plantae
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Spermatophyta
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plate tectonics (3)
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Precambrian
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Changzhougou Formation (1)
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Proterozoic
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Sinian
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Dengying Formation (1)
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sea-level changes (15)
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arkose (1)
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South America
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United States
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New constraints on the age, geochemistry, and environmental impact of High Arctic Large Igneous Province magmatism: Tracing the extension of the Alpha Ridge onto Ellesmere Island, Canada
ABSTRACT Deccan volcanism likely triggered environmental stress that controlled biotic transformations and Cretaceous/Paleogene (K/Pg) boundary mass extinction in the Indian subcontinent, but these revelations still remain inconclusive. Thus, we conducted high-resolution organo-molecular studies on a marine Um-Sohryngkew River K/Pg boundary succession. The results were used as standard reference for comparison with biotic attributes of the brackish water (Jhilmili) to freshwater (Anjar) intertrappean sediments and bole beds of the Deccan Traps. Organo-molecular compounds of the former section show strong correlation with the global stratotype section and point. High amounts of short-chain n -fatty acids and n -alkanes derived from autochthonous marine algal remains were observed in this section. However, the dominance of mid- and long-chain n -alkanes over short-chain n -alkanes in the Jhilmili intertrappean and intravolcanic bole beds of the eastern Deccan volcanic province suggested a terrestrial origin from higher plants under semiarid climatic conditions. The prolific abundance of n -alkanes in the Um-Sohryngkew River succession implies a mixture of terrestrial input from emergent and submerged/floating aquatic macrophytes. Low-molecular-weight aromatic hydrocarbon markers peak in biozone CF2 of the Um-Sohryngkew River succession. Possibly, this corresponds to greenhouse effects linked to the second phase of Deccan volcanism in the latest Maastrichtian, chron 29r. Abundant n -fatty acids found in the eastern Deccan bole beds suggest an origin from bacteria developed in a terrestrial environment. Depleted δ 13 C bulk values recorded from Jhilmili intertrappean and eastern Deccan bole beds are indicative of low primary productivity and burning of terrestrial biomass. Total organic carbon (TOC) maxima observed in the lowermost Danian P1a foraminiferal biozone of the Um-Sohryngkew River succession are also linked to late Deccan phase-two eruptions. The presence of three low-molecular-weight aromatic hydrocarbon markers in the eastern Deccan bole bed implies incomplete combustion of organic compounds in a terrestrial environment. Moreover, the dominance of high-molecular-weight aromatic hydrocarbon markers in biozone CF3 of the Um-Sohryngkew River succession is akin to that reported from other well-established K/Pg boundary successions, suggestive of their possible derivation from regional fire induced by the heat supplied by Deccan volcanism, which has been linked to the K/Pg boundary transition. Thus, regional wildfire played a significant role and affected the ecosystem, which perhaps accounts for the mass extinction.