Results 211 to 220 of about 9,012 (266)

Constraining flow and sediment transport intermittency in the geological past

Geological Society of America Bulletin, 2022
Quantitative investigations of ancient rivers usually provide insights into either instantaneous or mean flow conditions. There is a critical gap between these time scales of investigation, which reflects the intermittency of flow and sediment transport, and closing this gap is crucial to fully explore the dynamics and evolution of ancient fluvial ...
Lyster, Sinéad J., Whittaker, Alexander C., Farnsworth, Alex, Hampson, Gary J.   +3 more
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Lake Winnipeg: geological setting and sediment seismostratigraphy

Journal of Paleolimnology, 1998
Lake Winnipeg, the seventh largest lake in North America, is located at the boundary between the Interior Plains and the Canadian Shield in Manitoba, Canada. Seismic profiles were obtained in Lake Winnipeg on two geoscientific cruises in 1994 and 1996. These data indicate the morphology of the bedrock surface. In most cases, a clear distinction between
B. J. Todd, C. F. M. Lewis, E. Nielsen, L. H. Thorleifson, R. K. Bezys, W. Weber   +5 more
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Self-sedimentation of phytoplankton blooms in the geologic record

Sedimentary Geology, 1997
Abstract Understanding the formation of laminated, organic-rich sediments is an essential topic for researchers interested in fossil fuels, biogeochemical cycles, Earth's environmental history and global change. Biologists have very recently demonstrated that some marine phytoplankton blooms actively govern their own sedimentation by the formation of
Kurt A. Grimm, Carina B. Lange, Amarpal S. Gill   +2 more
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Geological Extrapolation and Pseud-Abyssal Sediments

AAPG Bulletin, 1942
ABSTRACT It is considered conceivable that the processes of dynamical geology which are active at the present day are unlikely to have been equally dominant throughout the whole of geological history. Late Neogene time has been a period of intense orogenic activity comparable with earlier epochs of the same character like those of the
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The geological record preserved by Amazon shelf sedimentation

Continental Shelf Research, 1996
Abstract A recent study of the subaqueous delta and coastal plain near the mouth of the Amazon River provides insight to the geological record created there and elsewhere. A compound clinoform structure is forming across the Amazon shelf. The uppermost portion is the shoreline, whose aggradation brings the modern sedimentary deposit to sea level and ...
Charles A. Nittrouer, Steven A. Kuehl, Alberto G. Figueiredo, Mead A. Allison, Christopher K. Sommerfield, James M. Rine, L. Ercilio C. Faria, Odete M. Silveira   +7 more
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Appraisals of hydrocarbon potentials of sediments on geological premises

International Geology Review, 1971
Prospecting risks, in exploratory drilling for oil and gas, as in Permian and Triassic formations, in a part of the Caucasian piedmont, may be reduced significantly by preliminary analysis of the following indications: mineralogical-geochemical facies of diagenesis; associations of clay minerals; metamorphism of sediments and organic substance (table 1)
M.S. Burshtar, F.E. Okun'kova, G.I. Teodorovich   +2 more
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The Geological Deformation of Sediments

1994
Introduction and overview. Mechanical principles of sediment deformation. Glacial deformation. Sedimentary deformational structures. Mass movements. Tectonic deformation - stress paths and strain histories. Fluids in deforming sediments. Melanges - illustrations of the dewatering, deformation, diagenesis interplay.
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Comparison of Geological and Engineering Parameters of Marine Sediments

Offshore Technology Conference, 1972
Abstract Three-inch diameter piston cores collected from the Gulf of Mexico undergo a large number of geological and soil engineering tests in order to determine relationships between various physical parameters. Electrical resistivity logs are run to determine zones of interest.
Arnold H. Bouma, William E. Sweet, Wayne A. Dunlap, William R. Bryant   +3 more
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Modelling Coastal Sedimentation through Geologic Time

Journal of Coastal Research, 2005
Abstract Many deterministic numerical models accurately predict wave action and coastal flow but are unable to represent sedimentary processes over geologic times either because their basic equations and numerical implementation do not allow the sediment-water interface to change through time, or because their degree of detail makes geologic-time ...
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Phytolithic analysis of geological sediments from Panama

Antiquity, 1985
The analysis of phytoliths, microscopic pieces of silica formed within the cells of living plants, is a recent addition to archaeobotanical studies in the New World (Carbone, 1977; Pearsall, 1978; Lewis, 1981; Robinson, 1983; Piperno, 1983, 1984, in press, a; Piperno & Clary, 1984). Because these mineralized bodies are very resistant to destruction
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