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Showing 1 to 20 of 149 for “"Depositional Environments"”.
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Depositional environments and diagenesis, Interlake Formation (Silurian), Williston Basin, North Dakota
… main purpose of this study was to interpret the depositional and diagenetic history of the Interlake Formation. Approximately 2,400 feet of Interlake core and 300 thin sections were studied, The Interlake was then divided into twelve lithotypes representing deposition in low-energy sublittoral, …
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Depositional environments and diagenesis, Winnipegosis Formation (Middle Devonian), Williston Basin, North Dakota
… of Winnipegosis rocks; these belong to seven environments of deposition which include deep basin, deep shelf, shallow shelf, reef, lagoon, tidal flat, and evaporite basin. The deposition of the Winnipegosis and Prairie Formations were inter-related and occurred during six episodes. Following a …
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Depositional Environments of the Miocene Esmeralda Formation, Stewart Basin, Stewart Valley, Nevada
… purpose of this study was to determine specific depositional environments of the Miocene Esmeralda Formation in Stewart Basin (Stewart Valley), Mineral County, Nevada. Previous workers have concentrated on paleontological aspects of the basin and have described in detail the molluscs, mammals and …
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Hydraulic flow zone unit characterisation and mapping for Australian geological depositional environments
… vital role in terms of understanding geological depositional environments and subsequent alteration (diagenesis). Geoscientists have traditionally classified rocks according to porosity, grain parameters (size, sorting and distribution) whereas reservoir engineers tend to emphasize the dynamic …
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Storm-dominated Lower Cambrian depositional environments in the Ravenswood area, Lander County, Nevada
… to represent marine, littoral to sublittoral environments including offshore bars, sheet deposits (proximal, intermediate, distal), patch reefs, and storm-surge ebb channels; The lithology, paleontology, and sedimentary structures reflect deposition in a wave-dominated or storm-dominated …
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Stratigraphy and Depositional Environments of a Late Pleistocene Barrier Island Complex, Southeastern Virginia
<p>The Norfolk, Kempsville, and Sand Bridge Formations beneath the HIckory Scarp of southeastern Virginia are reinterpreted as representing one glacio-eustatic transgressive cycle. The timing of this transgressive event is set during the earliest Wisconsinan. The formations were previously …
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Depositional environments and sandstone diagenesis in the Tyler Formation (Pennsylvanian), southwestern North Dakota
… units, reflecting both a change in lithology and depositional environments. The lower unit is dominated by varicolored, noncalcareous shales and mudstones, siltstones, thin coal beds, and medium-grained sandstones. The upper unit in the areas of the Square Butte to Fryburg fields may be divided …
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Depositional environments and history of the Winnipeg Group (Ordovician), Williston Basin, North Dakota
… Basin is due, at least partially, to post-depositional erosion of the Deadwood rather than to subsidence during Deadwood deposition.</p>
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Depositional environments and diagenesis of the Mississippian Bottineau interval (Lodgepole) in North Dakota
… marine transgression from the restricted depositional environment of the Bakken Formation resulted in normal marine circulation, Six major facies were developed: (1) the central basin, (2) basin flank, (3) open shelf, (4) crinoidal mudstone, (5) gray shale, and (6) restricted shelf. Marine …
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Depositional environments of the lower Tullock Formation (Paleocene), Slope County, southwestern North Dakota
… southwestern North Dakota to determine its depositional environments. The lithol ogies present are sand, silt, clay and lignite. A bed of lignite or yellow silt marks the base of the Tullock Formation throughout the study area.</p> <p>The silt beds are interpreted as having been deposited as …
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Depositional environments and sandstone diagenesis in the Tyler Formation (Pennsylvanian), western North Dakota
… 3,100 oil well logs were used to determine the depositional environments of the Tyler Formation (Pennsylvanian) in northwestern North Dakota. Ninety sandstone thin-sections were described and twenty-nine sandstone samples were analyzed by scanning electron microscope/X-ray microanalysis …
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Depositional environments and paleogeography of the Winnipeg Group (Ordovician), Williston Basin, North Dakota
<p> The Winnipeg Group (Upper Ordovician) unconformably overlies the Deadwood Formation (Cambrian - Lower Ordovician) over most of North Dakota, except in the extreme eastern part, where it lies directly on Precambrian basement rocks. The Winnipeg is conformably overlain by the Red River Formation …
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Stratigraphy and depositional environments: Lyons Formation (Permian), Golden-Morrison area, Jefferson County, Colorado
Includes bibliographical references.
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The Broom Creek Formation (Permian), in southwestern North Dakota: depositional environments and nitrogen occurrence
… the Broom Creek Formation. </p><p> A four-phase depositional model is proposed for the preservation of eolian dunes within the Broom Creek Formation, 1) migration of eolian dunes over a low-relief erosional surface, 2) marine transgression and partial reworking of dunes, 3) carbonate mud …
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Depositional Environments and Sequence Stratigraphy of Upper Mississippian Strata in the Central Appalachian Basin
The Upper Mississippian Hinton, Princeton, and Bluestone formations of southern West Virginia constitute a wedge of strata that filled the Appalachian basin over a ~7 million year time interval. Seventeen transgressive-regressive sequences comprise the study interval in the basin depocenter. Five …
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Depositional Environments and Diagenesis of the Devonian Dawson Bay Formation in Saskatchewan and Northwestern Manitoba
… and northwestern Manitoba, (2) to interpret the depositional environments and diagenesis, and (3) to discuss the implications of the new results. The Second Red Bed Member (SRBM) comprises mudstone and dolostone. This study shows that the mudstone was deposited in environments that ranged from …
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Stratigraphy, depositional environments, and petroleum potential of the Three Forks Formation -- Williston Basin, North Dakota
… distribution, petroleum potential, and paleo-environments of the Three Forks Formation in North Dakota as a potential for hydrocarbon exploration with the principal objective to evaluate the Three Forks Formation’s potential for future developments. The detailed lithology is computed by …
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Depositional environments and diagenesis of the Ratcliffe interval, Madison group (Mississippian), Williston Basin, North Dakota
<p>The Ratcliffe interval in North Dakota is a log marker-defined unit in the Williston Basin. It is Mississippian in age and crosscuts the lower Charles and upper Mission Canyon Formations of the Madison Group. Study of cross-sections, well core, and thinsections show that the Ratcliffe is …
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Stratigraphy and depositional environments of the Fox Hills Formation (Upper Cretaceous), Bowman County, North Dakota
… processes (Colgate Member). In contrast to the depositional conditions that existed later to the east in the type area (i.e., deep water and subsidence or sea level rise), deposition on the southwest basin rim was characterized by rapid progradation over a shallow shelf under local tectonic …
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