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Showing 1 to 20 of 22 for “"Green River Formation"”.
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High temperature characterization of oil shales: the Green River Formation
Includes bibliographical references.
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Unique Preservation of Fossil Ghost Fish in the Green River Formation
… evaporite-rich, fossil poor Angelo Member in the Green River Formation in Fossil Basin, Wyoming. These two beds, termed “Ghost Fish” beds, contain fossil fish that are two-dimensional carbonaceous compressions with no bone and detailed soft part preservation. These beds were measured and samples …
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Distribution of bromine in bedded halite in the Green River Formation, southwestern Wyoming
Includes bibliographical references.
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Paragenesis of Lacustrine Microbialites in the Upper Wilkins Peak Member, Green River Formation, Wyoming
… These stages are:</p> <p>1) Microbialite formation in a freshwater lake;</p> <p>2) Dolomitization of microbialites via evaporative pumping and capillary draw;</p> <p>3) Early post-burial microbialite silicification in the unit below the layered tuff;</p> <p>4) High degree of microbialite …
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Geomechanical property changes with hydrous pyrolysis in Mahogany oil shale in Green River Formation
The formation characteristics of organic-rich shales have proven to be affected by mineralogical composition, total organic content, water concentration, and bedding-plane orientation along with other parameters. However, it is not known with good accuracy what types of influence thermal maturation …
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Paleogeography and Paleoenvironments of the Lower Unit, Fossil Butte Member, Eocene Green River Formation, Southwestern Wyoming
… Lake was one of several lakes into which the Green River Formation was deposited in Wyoming, Utah and Colorado.</p> <p>Detailed stratigraphic analysis of the Lower Unit of the Fossil Butte Member revealed a well developed lacustrine sequence south of Fossil Butte, and indicates four major …
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Paleoenvironments of the Eocene Green River Formation (Laney Member) in the Anvil Wash area, Southwestern Wyoming
… conchostracans in the Laney Member of the Green River Formation, Wyoming, has contributed to the resolution of the controversy over the depositional environment of finely laminated sediments. Conchostracans that typically live in ephemeral pools, pulmonate gastropods that require oxygenated …
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Depositional Environments of Siliceous Laminites in the Laney Member of the Green River Formation, Sublette County, Wyoming
<p>Siliceous shales of the Laney Member of the Green River Formation are exposed in outcrops around Fontenelle Reservoir in the northwest corner of the Green River Basin, Wyoming. An analysis of these shales is important to an understanding of the origin of laminites in the Green River formation. …
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The fluidized retorting of oil shale from the Mahogany ledge of the Green River formation of Colorado
Considerable work has been done on the economic production of shale oil from oil shale. Of the possible materials which could replace crude petroleum as used today, oil shale possesses the greatest possibilities since, when retorted, it produces a shale oil very similar to crude petroleum, and on …
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Facies, stratigraphy, and mineralogy of the carbonate marker and D marker units, lower Green River Formation, Uinta Basin, Utah
… extensive carbonate beds within the Lower Green River Formation in the Uinta basin. Both units were measured in a series of accessible canyons along the Roan Cliffs on the southern margin of the basin. This was accomplished by incorporating measured outcrop, petrographic analysis, X-ray …
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Palynology and Paleoecology of the Fossil Butte Member of the Eocene Green River Formation in Fossil Basin, Lincoln County, Wyoming
<p>The palynoflora of the Fossil Butte Member of Green River Formation was studied to enhance our understanding of the depositional environment of ancient Fossil Lake. Forty-nine outcrop samples were collected from three measured sections representing the center, the margin, and intermediate areas …
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The Provenance of Eocene Tuff Beds in the Fossil Butte Member of the Green River Formation of Wyoming: Relation to the Absaroka and Challis Volcanic Fields
<p>The Green River Formation was deposited between 53.5 and 48.5 Ma. The Angelo, Fossil Butte, and Lower members of the Green River Formation at Fossil Basin, preserve ash fall tuffs deposited in ancient Fossil Lake. 40Ar/39Ar dating of sanidine yielded eruptive ages of 51.29 ± 1.29 Ma and 52.20 ± …
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Lake Magadi and the Soda Lake cycle: a study of the modern sodium carbonates and of Late Pleistocene and Holocene lacustrine core sediments
… vast trona and nahcolite deposits of the Eocene Green River Formation. Lake Magadi has been evolving since 1.08 Ma within a well-known region of early hominin activity in East Africa. As part of the Hominin Sites and Paleo-lakes Drilling Project (HSPDP) four boreholes were drilled beneath Lake …
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Lacustrine Deltaic Deposits of the Sandstone Tongue of the Wasatch Formation, Fossil Basin, Wyoming
… relations of the sandstone tongue of the Wasatch Formation in Fossil Basin, Wyoming are interpreted as indicative of a rapidly prograding bird's foot delta. Two upward coarsening siliciclastic sequences that contain bottomset, foreset, and topset beds were studied over an area of approximately 400 …
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Dead bugs do tell tales: implications of a new fossil assassin bug (Heteroptera: Reduviidae) for the evolutionary history and systematics of an extant lineage
… (Reduviidae: Harpactorinae), described from the Green River Formation of Colorado. The specimens informing this description are marked by an extraordinary level of preservation, particularly in external and internal structures of the adult male genitalia. Following the description, discussions of …
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A Uintan (Late Middle Eocene) Flora and Fauna from the Uinta Basin, Utah
… and vertebrae fossils from the Uinta Formation in the Uinta Basin, south of Myton, Utah, USA, provides evidence of environmental change. Paleobotanical specimens are preserved in late stage Uinta Lake sediments and coarse-grained fluvial sediments which are stratigraphically 650 to 660 …
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An Avian Botulism Epizootic Affecting a Nesting Site Population of Presbyornis : on a Carbonate Mudflat Shoreline of Eocene Fossil Lake
… is best known from the Eocene Green River Formation where it often occurs in local monospecific bonebeds, suggestive of mass mortality events. The sedimentology, paleontology, taphonomy, XRD mineralogy, and the carbonate stable isotope signature (δ<sup>18</sup>O) of one of these …
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Geology of the Phil Pico Mountain Quadrangle, Daggett County, Utah, and Sweetwater County, Wyoming
… Eocene Wasatch and middle to late Eocene Bridger Formations. These formations are separated by the Henrys Fork fault which has thrust Wasatch Formation next to Bridger Formation. The Wasatch Formation is clearly synorogenic and contains an unroofing succession from the adjacent Uinta Mountains. On …
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Reweaving the tapestry: a supertree of birds
… belonging to the Primobucconidae from the Green River Formation of Wyoming (USA), which were assigned to the species Primobucco mcgrewi. Although incomplete, these specimens had preserved anatomical features not seen in other material. An attempt to further constrain their phylogenetic …
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THE APPLICATION OF OXIDATIVE HYDROTHERMAL DISSOLUTION (OHD) TO ORGANIC-RICH SHALES
… they provide novel structural and biomarker information that complements typical bulk organic matter characterization methods. Furthermore, typical oil shale utilization methods are plagued by environmental concerns akin, in some respects, to the environmental concerns associated with the coal …
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