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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Angola
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Cabinda Angola (4)
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Central African Republic (3)
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Congo (7)
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Congo Democratic Republic
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Egypt
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Libya (3)
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Tunisia (1)
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West Africa
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Caribbean region
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Highland region Scotland
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Mediterranean region
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Mediterranean Sea
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East Mediterranean
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Mexico (2)
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North America
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Appalachians
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Gulf Coastal Plain (5)
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Rocky Mountains
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Oceania
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Pacific Ocean
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East Pacific
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North Pacific
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South America
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Colombia
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United States
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Wyoming
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commodities
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brines (3)
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construction materials
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petroleum
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carbon
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chemical ratios (2)
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halogens
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chlorine
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hydrogen
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isotope ratios (8)
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isotopes
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Invertebrata
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Insecta
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Rotaliacea
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upper Quaternary (1)
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Tertiary
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Paleogene
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upper Oligocene
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Paleocene
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lower Paleocene
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upper Paleocene (2)
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pyroxene group
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zircon group
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ring silicates
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sheet silicates
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sulfates (1)
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sulfides
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-
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Primary terms
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absolute age (31)
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Africa
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Egypt
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Tunisia (1)
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Asia
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Far East
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boron
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carbon
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C-13/C-12 (4)
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organic carbon (7)
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Caribbean region
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West Indies
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Caspian Sea (1)
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Cenozoic
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Agbada Formation (12)
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Quaternary
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Holocene
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Pleistocene
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upper Quaternary (1)
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Tertiary
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Pliocene
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Paleogene
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Eocene
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Ameki Formation (1)
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Ewekoro Formation (2)
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Imo Shale (3)
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Oligocene
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upper Oligocene
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Paleocene
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upper Paleocene (2)
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Central America
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clay deposits (4)
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Europe
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Western Europe
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Scotland
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Highland region Scotland
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Moine thrust zone (1)
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faults (81)
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hydrogeology (5)
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lamprophyres (1)
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ultramafics
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-
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porphyry (2)
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flood basalts (1)
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trachytes (5)
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-
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impact statements (1)
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inclusions
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fluid inclusions (3)
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Indian Ocean Islands
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industrial minerals (3)
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intrusions (27)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda
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Podocopida
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Platycopida
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Cytherellidae (1)
-
-
-
-
-
Insecta
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Pterygota
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Neoptera
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Endopterygota
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Hymenoptera (1)
-
-
-
-
-
-
Trilobitomorpha
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Trilobita (1)
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-
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Bryozoa (1)
-
Mollusca
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Cephalopoda
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Ammonoidea
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Ammonites (1)
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-
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Gastropoda (1)
-
-
Protista
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Foraminifera
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Rotaliina
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Buliminacea
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Bolivinitidae (1)
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Uvigerinidae
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Uvigerina (1)
-
-
-
Cassidulinacea
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Anomalinidae
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Cibicidoides (1)
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Cassidulina (1)
-
-
Globigerinacea
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Globigerinidae
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Globigerinoides
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Globigerinoides ruber (1)
-
-
-
-
Rotaliacea
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Miogypsinidae (1)
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Nummulitidae
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Nummulites (1)
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-
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Textulariina (1)
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isostasy (1)
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C-14 (2)
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (4)
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D/H (1)
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O-18 (1)
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O-18/O-16 (3)
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S-34/S-32 (1)
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Sr-87/Sr-86 (1)
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-
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kaolin deposits (4)
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land use (2)
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lava (4)
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magmas (10)
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Malay Archipelago
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mantle (5)
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Mediterranean region
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Balearic Islands
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Majorca (1)
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-
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Mediterranean Sea
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East Mediterranean
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Levantine Basin (1)
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-
-
Mesozoic
-
Cretaceous
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Asu River Group (5)
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Lower Cretaceous
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Albian (4)
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Aptian (3)
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-
-
Upper Cretaceous
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Campanian (3)
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Maestrichtian
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upper Maestrichtian (1)
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Santonian (3)
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Senonian (10)
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Turonian (1)
-
-
-
Jurassic
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Lower Jurassic (1)
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Middle Jurassic
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Bajocian
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Brent Group (1)
-
-
-
Upper Jurassic
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Kimmeridge Clay (1)
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Morrison Formation (1)
-
-
-
Triassic
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Upper Triassic (1)
-
-
-
metal ores
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base metals (1)
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metals
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actinides
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thorium
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Th-232 (1)
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uranium
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U-238 (1)
-
-
-
alkali metals
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cesium
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Cs-137 (1)
-
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potassium
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K-40 (1)
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rubidium (2)
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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-
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arsenic (1)
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lead
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Pb-210 (1)
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manganese (2)
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rare earths
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tantalum (1)
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zirconium (1)
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-
metamorphic rocks
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amphibolites (1)
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orthogneiss (1)
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granulites (3)
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itabirite (1)
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marbles (1)
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metacarbonate rocks (1)
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metaigneous rocks
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metagranite (1)
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serpentinite (2)
-
-
metasedimentary rocks
-
metagraywacke (1)
-
-
metasomatic rocks
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greisen (4)
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serpentinite (2)
-
-
migmatites (4)
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metamorphism (4)
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Mohorovicic discontinuity (1)
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North America
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Appalachians
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Valley and Ridge Province (1)
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Gulf Coastal Plain (5)
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Rocky Mountains
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ocean basins (1)
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oceanography (2)
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oxygen
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O-18/O-16 (3)
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Pacific Coast (1)
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East Pacific
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Monterey Canyon (1)
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North Pacific
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Cascadia Basin (1)
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paleoclimatology (8)
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paleoecology (8)
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Paleozoic
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Cambrian
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Lower Cambrian (4)
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Carboniferous
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Mississippian
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Upper Mississippian
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Chesterian
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Imo Formation (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Decadal architecture and morphodynamics of modern, river-fed turbidite systems: Bute Inlet and Congo Fan Available to Purchase
Detrital zircon U-Pb geochronology of some metasedimentary units in the Jebba-Bode Saadu area southwestern Nigeria: Implications for northwest Africa – northeast Brazil connections in the Proterozoic Available to Purchase
In-situ zircon and cassiterite LA-ICP-MS geochronology and implications for granite-hosted Sn deposit models and exploration: Insights from the Cameroon Line Available to Purchase
Anatomy of Niger and Benue river sediments from clay to granule: grain-size dependence and provenance budgets, Nigeria Available to Purchase
Scotland's geology: evolution, crustal structure and societal relevance Free
Assessing soil contamination by potentially toxic elements in artisanal and small-scale gold mining sites of the Adamawa Region, Cameroon Available to Purchase
Mineralogy of Lateritic Weathering Profiles Developed on the Rocks under a Sub-equatorial Monsoon Climate: Case of the Bambouto Mountains Available to Purchase
Seismic net-to-gross estimation for a geologic model update: A case study from a turbidite lobe reservoir in the deepwater of the Niger Delta Available to Purchase
Mineralogy, Geochemistry and Industrial Appraisal of Kaolin from Abeokuta Area, Southwestern Nigeria Available to Purchase
Geometrical restoration of a late Neoproterozoic depositional framework and an intrabasinal unconformity in the Laurentian margin Dalradian Supergroup, Grampian Highlands, Scotland Open Access
Compressed earthen blocks using alluvial clays from Mbam: performance comparison using statistical analysis of cement vs heat-stabilized blocks Open Access
A tectonic solution for the Early Cambrian palaeogeographical enigma Available to Purchase
Abstract The Early Cambrian palaeogeographical enigma arises when tectonic reconstructions are made using palaeoclimatic v. palaeomagnetic data that result in possibly contradictory tropical, mid-latitude, and south polar locations for major continents. For example, NW Africa and Cadomia may have lain in a tropical zone (0° to ±30° latitude) based on the presence of archaeocyath reefs, minor evaporites, and carbonate platforms at c. 520 Ma ± 5 Ma or, alternatively, NW Africa and Cadomia may have lain in a south polar zone (90° to 60° south latitude) based on palaeomagnetic constraints. Greater Avalonia may have evolved independently from NW Africa if a dropstone constraint implying polar latitudes at c. 530 Ma and a palaeomagnetic constraint implying c. 50° latitude at c. 505 Ma are accommodated. We show here how counterclockwise rotation of Gondwana during the Cambrian about an interior axis may solve the enigma. Gondwanan apparent polar wander becomes consistent with tropical conditions inferred for NW Africa when adjusted to accommodate constraints placing the south pole near Peru for c. 540–520 Ma. Concurrent counterclockwise rotation of Baltica and Gondwana during the Middle Cambrian may have facilitated separation of Greater Avalonia from Baltica across dextral shear zones.
3D seismic analysis of Cenozoic slope deposits and fluid-flow phenomena along the Nigerian Transform Margin Available to Purchase
Abstract 3D seismic data provide new insights on c. 2 km thick Cenozoic post-transform slope sediments and fluid-flow phenomena along the Nigerian Transform Margin. The study documents large-scale mass-transport deposits (MTDs), deep-water channels, sediment waves, and a range of fluid-flow phenomena such as pockmarks, pipes, seabed mound and gas hydrates. They are observed from Pliocene-aged sediments and distributed above structural highs, regional faults, and active and relict deep-water channels in the eastern part of the area, closest to the Niger Delta cone. The fluid-flow features are interpreted to be indicative of an active petroleum system in the deeper subsurface and from fluid migration along planes of deep-seated faults. MTDs are mapped at multiple levels and the volume of failed sediments increased through time within the western part of the study area. The repeated and increased volume of MTDs in the area is attributed to an increased rate of sedimentation through time and slope gradient during the late Cenozoic. The presence of repeated MTDs and fluid-flow phenomena on the Nigerian Transform Margin has implications for installations of offshore facilities as they constitute potential geohazards. The study also documents, for the first time, polygonal fault systems offshore Nigeria.
Quantifying a tide-dominated, wave-, and river-influenced delta in Miocene facies of the Niger Delta basin Available to Purchase
Geoelectrical and Remote Sensing in the Characterization of the Pan-African Meta-sedimentary Basement Aquifer Systems: A Case Study at Nkoteng-Elap, Central Region of Cameroon Available to Purchase
Provenance of Beach Sands in the Northern Gulf of Guinea, SW Cameroon Available to Purchase
Characterization of refractory bricks from selected Cameroonian kaolins Open Access
A mechanical basis of fault-bend folding Available to Purchase
Descriptive systematics of Upper Palaeocene–Lower Eocene pollen and spores from the northern Niger Delta, south-eastern Nigeria Open Access
The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact Open Access
Abstract The Ordovician of North and West Africa comprises three main transgressive–regressive sequences understood as ‘second-order’ cycles of 10–15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates to the north, include fluvial deposits over the most proximal southern stretches of the platform. The boundary with Cambrian strata remains unclear but the latter are progressively less represented to the south in the undifferentiated ‘Cambro-Ordovician’. To the north, graptolites, brachiopods and trilobites combined with palynomorphs provide a robust biostratigraphic frame. Maximum flooding intervals occurred in the early to middle Tremadocian, middle Darriwilian and middle to late Katian. Two events interfered with an overall long-term transgressive trend. The ‘intra-Arenig’ (late Floian?) tectonic event highlighted palaeohighs coinciding with Paleoproterozoic basements. Gondwanan drainage basins were reorganized, which had an impact on sediment sourcing and distribution of detrital material (e.g. zircons) feeding the pre-Variscan Europe. The second event is the end-Ordovician glaciation. The domain supported the greatest part of the Hirnantian glaciers and may also have preserved pre-Hirnantian glacial archives. It is not until the very latest Ordovician that offshore conditions developed far inland; it is however suspected that this inundation benefited from a transient postglacial isostatic flexure.