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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Angola (1)
-
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Madagascar (3)
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North Africa
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Algeria (1)
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Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (1)
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Egypt
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Morocco
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Tafilalt (1)
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Tunisia (2)
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Southern Africa
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Karoo Basin (1)
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South Africa (2)
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West Africa
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Benue Valley (1)
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Nigeria
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Niger Delta (1)
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Senegal (1)
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Alexander Island (1)
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Antarctica
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Ellsworth Land (1)
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Arctic Ocean
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Arctic region
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Asia
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Far East
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West Siberia
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Atlantic Ocean
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Australasia
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Australia
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Western Canada
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Russian Federation
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Russian Arctic
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Russian Far East (3)
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Siberian Platform
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Sikhote-Alin Range (1)
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Tyumen Russian Federation
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Yamal-Nenets Russian Federation
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Volga region (1)
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Urals
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Marches Italy (3)
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Ukraine
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Western Europe
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France
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United Kingdom
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England
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Somerset England
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Mendip Hills (1)
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Wessex Basin (1)
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Yorkshire England
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North Yorkshire England (1)
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Scotland
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Hebrides
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Inner Hebrides
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Isle of Skye (1)
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Highland region Scotland
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Inverness-shire Scotland
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Isle of Skye (1)
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Moray Firth (1)
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Wales (1)
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Glass Mountains (1)
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Indian Ocean
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Mexico
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USSR (14)
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commodities
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petroleum
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elements, isotopes
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carbon
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chemical ratios (1)
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isotope ratios (25)
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isotopes
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stable isotopes
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metals
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nitrogen
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oxygen
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fossils
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Proboscidea
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Reptilia
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ichnofossils
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Invertebrata
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Brachiopoda (5)
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Echinodermata
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Mollusca
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Bivalvia
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Ostreoidea
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Pterioida
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Cephalopoda
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Ammonoidea
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Ammonites (227)
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Hildocerataceae
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Coleoidea
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Gastropoda
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Planorbis (2)
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Porifera
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Stromatoporoidea (1)
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Protista
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Foraminifera
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Orbitoidacea (1)
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Textulariina
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Orbitolina (1)
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Radiolaria (6)
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Tintinnidae
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Calpionellidae (2)
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microfossils
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Conodonta (2)
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Fusulinidae (1)
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palynomorphs
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Dinoflagellata (11)
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Plantae
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nannofossils (12)
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Spermatophyta
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thallophytes (1)
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geologic age
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Cenozoic
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Tertiary
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Mesozoic
-
Cretaceous
-
Asu River Group (1)
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-
Comanche Peak Limestone (1)
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Edwards Formation (1)
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-
-
Dakota Formation (1)
-
Lower Cretaceous
-
Agrio Formation (1)
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Albian
-
upper Albian (2)
-
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Aptian (5)
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-
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Mancos Shale (1)
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Bearpaw Formation (1)
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Belle Fourche Shale (1)
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upper Campanian (2)
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Cardium Formation (2)
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Carlile Shale (1)
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Dunvegan Formation (1)
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upper Cenomanian (2)
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Kanguk Formation (1)
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Saratoga Chalk (1)
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Senonian (13)
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lower Turonian (2)
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Yezo Group (1)
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Franciscan Complex (1)
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-
Bazhenov Formation (2)
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Lower Jurassic
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lower Liassic (6)
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middle Liassic (5)
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Nordegg Member (3)
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lower Toarcian (4)
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upper Liassic (11)
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-
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Callovian (14)
-
-
Oxford Clay (3)
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Upper Jurassic
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Arab Formation (4)
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lower Kimmeridgian (3)
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upper Kimmeridgian (1)
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upper Oxfordian (3)
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Shublik Formation (1)
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Paleozoic
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ophiolite (3)
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sheet silicates
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Primary terms
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absolute age (10)
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Africa
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carbon
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Reptilia
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igneous rocks
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Indian Ocean
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Argo abyssal plain (1)
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Indian Ocean Islands
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Invertebrata
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Brachiopoda (5)
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Cnidaria
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Anthozoa
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Actiniaria (1)
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Echinodermata
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Echinozoa
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Mollusca
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Bivalvia
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Heterodonta
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Rudistae (2)
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Ostreoidea
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Ostrea (1)
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Pterioida
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Pteriina
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Inocerami
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Inoceramus (2)
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Cephalopoda
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Ammonoidea
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Ammonites (227)
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Scaphites (2)
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Coleoidea
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Nautiloidea
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Nautilus (1)
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Gastropoda
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Pulmonata
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Planorbis (2)
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Porifera
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Stromatoporoidea (1)
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Protista
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Foraminifera
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Fusulinina
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Rotaliina
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Orbitoidacea (1)
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Textulariina
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Radiolaria (6)
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Tintinnidae
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isotopes
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Re-187/Os-188 (1)
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C-13/C-12 (26)
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N-15/N-14 (1)
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Sr-87/Sr-86 (2)
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maps (1)
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Mediterranean region (2)
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Mesozoic
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Cretaceous
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Asu River Group (1)
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Comanchean
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Comanche Peak Limestone (1)
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Edwards Formation (1)
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Fredericksburg Group (1)
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Dakota Formation (1)
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Lower Cretaceous
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Agrio Formation (1)
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Albian
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upper Albian (2)
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Aptian (5)
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Barremian (1)
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Berriasian (3)
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Comanche Peak Limestone (1)
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Hauterivian (3)
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Mowry Shale (1)
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Valanginian (8)
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Mancos Shale (1)
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Middle Cretaceous (1)
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Upper Cretaceous
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Bearpaw Formation (1)
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Belle Fourche Shale (1)
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Campanian
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upper Campanian (2)
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Cardium Formation (2)
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Carlile Shale (1)
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Cenomanian
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Dunvegan Formation (1)
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upper Cenomanian (2)
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Coniacian (5)
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Eagle Sandstone (1)
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Fox Hills Formation (3)
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Greenhorn Limestone (1)
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Gulfian
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Eagle Ford Formation (2)
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Navarro Group (1)
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Kanguk Formation (1)
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K-T boundary (2)
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Maestrichtian (10)
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Pierre Shale (4)
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Saratoga Chalk (1)
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Senonian (13)
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Tropic Shale (2)
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Turonian
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lower Turonian (2)
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Yezo Group (1)
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Franciscan Complex (1)
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Jurassic
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Bazhenov Formation (2)
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Fernie Formation (3)
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Ferrar Group (2)
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Lower Jurassic
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Hettangian (2)
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middle Liassic (5)
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Nordegg Member (3)
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Pliensbachian (11)
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upper Liassic (11)
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Middle Jurassic
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Aalenian (3)
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Yakoun Group (1)
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Bathonian (6)
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Callovian (14)
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Oxford Clay (3)
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Upper Jurassic
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Arab Formation (4)
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Hanifa Formation (5)
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Kimmeridge Clay (5)
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Kimmeridgian
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lower Kimmeridgian (3)
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upper Kimmeridgian (1)
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Oxfordian
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middle Oxfordian (3)
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upper Oxfordian (3)
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Portlandian (2)
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Smackover Formation (2)
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Tithonian (2)
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Volgian (6)
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Maiolica Limestone (1)
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Triassic
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Anisian (1)
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Shublik Formation (1)
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Upper Triassic
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Carnian
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Ischigualasto Formation (1)
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-
-
-
-
metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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aluminum (1)
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osmium
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Re-187/Os-188 (1)
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rare earths (1)
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rhenium
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Re-187/Os-188 (1)
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metamorphic rocks
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metasedimentary rocks (1)
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Mexico
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minerals (1)
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nitrogen
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N-15/N-14 (1)
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North America
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Basin and Range Province (1)
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Omineca Belt (1)
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Western Interior
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Williston Basin (1)
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ocean basins (1)
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Ocean Drilling Program
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Leg 123
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ODP Site 765 (1)
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ocean floors (2)
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oil and gas fields (3)
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oxygen
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O-18/O-16 (9)
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Pacific Ocean
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Pacific region (1)
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paleoclimatology (10)
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Paleozoic
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Permian (1)
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palynology (2)
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petroleum
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Plantae
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nannofossils (12)
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Rhodophyta
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Corallinaceae (1)
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Spermatophyta
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Coniferae (1)
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plate tectonics (6)
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Precambrian
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Proterozoic (1)
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reefs (2)
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sea-level changes (34)
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chemically precipitated rocks
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clastic rocks
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coal (1)
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sedimentary structures
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soft sediment deformation
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sedimentation (24)
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sediments
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South America
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Brazil (1)
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United States
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Alabama
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Alaska
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California
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USSR (14)
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rock formations
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Dakhla Shale (1)
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Ivishak Formation (1)
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Peace River Formation (1)
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Raton Formation (1)
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Santa Maria Formation (1)
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Taylor Group (1)
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sedimentary rocks
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flysch (1)
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sedimentary rocks
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carbonate rocks
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Ammonites
Formation of ammonite concretions through organic decomposition in the iron-reduction zone
Microfossils, High-Resolution Stratigraphy, Geochemistry and Lithology of the Upper Jurassic and Lower Cretaceous (Urdyuk-Khaya and Paksa Formations) in the Nordvik Peninsula, Anabar Bay, Laptev Sea
Abstract The shallow marine carbonate deposits of the S. Miguel Formation in the Lusitanian Basin reveal erosional events exposing stiff substrates with abundant Bergaueria hemispherica . The ichnoassociation represented by B. hemispherica , Thalassinoides suevicus , Spongeliomorpha isp., Asterosoma ludwigae and Rhizocorallium commune is dated from lowermost Pliensbachian by the association with ammonites from the jamesoni Biozone, brevispina Subzone. The unlined forms of B. hemispherica include peripheral and bottom burrow concentrations of shell debris, annular-like structures in the burrow margin and paired burrows-to-linear clusters that are comparable with the penetrative burrowing mechanism, anchoring and feeding behaviours of sea anemones. From the ethological point of view, and comparing with modern behaviours of burrowing anemones, the B. hemispherica from the Lusitanian Basin may represent temporary burrowing and relocation of actiniarian anemones. Their comparison with either thenarian or athenarian actiniarians may evidence a preferred surficial feeding strategy on the organic-rich muddy sediments they burrowed.
Stratigraphy, Lithology, and Geochemistry of Coastal and Shallow-Sea Sections of the Uppermost Middle Jurassic–the Lowermost Cretaceous Section in the Anabar River Region (Arctic Siberia)
Middle Oxfordian carbon cycle perturbation expressed in the Smackover Formation, Gulf of Mexico
Abstract Quantitative analysis performed on latest Pliensbachian–early Toarcian calcareous nannofossil assemblages from the Camino section (Basque Cantabrian Basin) allowed their response to the environmental changes recorded during this time interval to be deciphered, characterized by an extinction event. The results were introduced within a principal component analysis and compared with the stable isotope and total organic carbon curves. During the latest Pliensbachian, the Mirabile and the lowermost part of the Semicelatum Ammonite Subzones, Schizosphaerella , Bussonius prinsii , Biscutum finchii , Calcivascularis jansae and Similiscutum avitum , taxa that probably thrived in rather cold waters, dominated the calcareous nannofossil assemblages. Coinciding with warmer and wetter conditions, which probably led to an increase in surface water fertility, recorded slightly below the extinction boundary, the mesotrophic taxa B. novum , L. hauffii and Calyculus spp. were dominant. Nevertheless, T. patulus and C. jansae , which became extinct just below the extinction boundary, show preferences for oligotrophic conditions. Salinities similar to those of modern oceans have been inferred around the extinction boundary, considering the coupling between the abundances of Calyculus spp. and the species richness together with the absence of black shales. After the extinction boundary, nannofossil assemblages were dominated by the deep-dwelling C. crassus and the shallow-dwelling Lotharingius species, interpreted as opportunistic taxa. This work confirms that calcareous nannofossils are a really useful tool for palaeoceanographic and palaeoenvironmental reconstructions, especially in terms of climatic changes.
Abstract This study focuses on a condensed sequence of alternating carbonate–clastic sediments of the Barrington Member, Beacon Limestone Formation (latest Pliensbachian to early Toarcian) from Somerset (SW England). Abundant ammonites confirm (apart from the absence of the Clevelandicum and Tenuicostatum ammonite subchronozones) the presence of Hawskerense Subchronozone to Fallaciosum–Bingmanni subchronozones. Well-preserved, sometimes diverse assemblages of ostracods, foraminifera, nannofossils and low-diversity dinoflagellate assemblages support the chronostratigraphic framework. Stable-isotope analyses demonstrate the presence of a carbon isotope excursion, relating to the Toarcian Oceanic Anoxic Event, within the early Toarcian. Faunal, geochemical and sedimentological evidence suggest that deposition largely took place in a relatively deep-water (subwave base), mid-outer shelf environment under a well-mixed water column. However, reduced benthic diversity, the presence of weakly laminated sediments and changes in microplankton assemblage composition within the Toarcian Oceanic Anoxic Event indicates dysoxic, but probably never anoxic, bottom-water conditions during this event. The onset of the carbon isotope excursion coincides with extinction in the nannofossils and benthos, including the disappearance of the ostracod suborder Metacopina. Faunal evidence indicates connectivity with the Mediterranean region, not previously recorded for the UK during the early Toarcian.