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Showing 1 to 11 of 11 for “"Cretaceous sediments"”.
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A palynological investigation of Upper Jurassic basal Cretaceous sediments from England, France and Iberia
… some comment to be made on the potential of the sediments for sourcing hydrocarbons. In particular it is demostrated that the highly bituminous Kimmeridgian sediments from Dorset and Yorkshire ha ve considerable potential for sourcing oil. Microplankton assemblages (dinoflagellate cysts and …
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Palynostratigraphy of Uppermost Albian to basal Coniacian (Cretaceous) sediments from the Western Anglo-Paris Basin
The distribution of dinoflagellate cysts in sediments of the mid Cretaceous from the western Anglo-Paris Basin are examined. Samples were collated from a range of facies types (i.e. basin margin-central basin), but particular emphasis was placed on those which represented deposition around the …
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Effects of erosion on pore pressure and groundwater flow in the Western Canada Sedimentary Basin
… with the topography of the land surface occur in Cretaceous sediments over much of the western Canada sedimentary basin. I used a numerical model to study the origin of the low pressure in southern Alberta and its effects on patterns of regional groundwater flow over the past 5 m.y. The model …
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A Landslide Near Oslo, Minnesota
… age, stream and lake deposits of Recent age, and Cretaceous sediments which extend beneath the glacial drift and the lake sediments. </p>
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Paleocurrent Analysis of the Cretaceous Mitchell Formation, North-Central Oregon
<p>Cretaceous sedimentary rocks of north-central Oregon previously referred to as the Hudspeth and Gable Creek formations and recently renamed the Mitchell Formation are potential petroleum source and reservoir rocks. Thus, determining their extent under the cover of Tertiary volcanics is of great …
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Kaolinitic weathering zone on Precambrian basement rocks, Red River Valley, eastern North Dakota and northwestern Minnesota
… where the Precambrian is directly overlain by Cretaceous rocks. Where the deepest, least weathered rocks are foliated, ghost-like traces of the structures can be seen in slightly to moderately altered weathering products. Scanning electron microscope/microprobe studies show that micas and …
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The geohydrology of the Swartkops River Basin : Uitenhage Region, Eastern Cape
… another by an impermeable, confining layer of Cretaceous sediments in the central and eastern parts of the study area, causing artesian conditions in places. The groundwater of the aquifers in the study area has a sodium-chloride character of low salinity in the western high-lying portion of …
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Dinoflagellate biostratigraphy of the Cretaceous-Tertiary boundary, Round Bay, Maryland
… of the assemblage changes suddenly at the Cretaceous-Tertiary boundary with thirteen species making the~r first appearance at or just above the boundary. Nineteen species cross the boundary and thirty-five species are restricted to the Cretaceous. The rather sudden change in the nature of …
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The sedimentology, palaeoecology and stratigraphy of cretaceous rocks in N.W. Scotland
Sediments of Cretaceous age in N.W. Scotland outcrop in small, often isolated exposures throughout the Inner Hebrides and Morvern, and have been dealt with cursorily in most previous work on the Cretaceous rocks of Britain. The aims of this study were (i)to propose a formal integrated stratigraphic …
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Geohydrological studies of the Western Shores of lake St Lucia
… the permeable succession is restricted to post-Cretaceous sediments. The low permeable Cretaceous siltstones, the Lebombo volcanics and the Karoo sediments were all selected to coincide with the base of the numerical model. The overlying, semi-permeable to permeable, upward-fining calcareous and …
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Sediment incorporation into continental arc systems and paleogeography of the western North American Cordillera: Insights from the North Cascades, Washington
… convergent-margin settings. These incorporated sediments are proposed to play a significant role in the evolution of the arc by potentially triggering high-flux magmatism and driving newly formed crust towards more felsic compositions. Therefore, it is important to document the mechanisms by …