Stratigraphy and Sedimentology of the Lower Frontier Formation (Cretaceous), Southwestern Bighorn Basin, Wyoming PDF Download
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Author: Stuart R. Holtzclaw
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 230
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Book Description
Author: Stuart R. Holtzclaw
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 230
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Book Description
Author: Peter H. Griggs
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 466
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Author: Peter H. Griggs
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 504
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Author: Jordan M. Bremer
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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Book Description
The Mowry Shale (Albian-Cenomanian) is an extensive mudrock dominated unit historically believed to represent a single, long-term deep water sequence within the Western Cordilleran Foreland Basin of North America. While the Mowry Shale has received study for almost a century, detailed stratigraphic context is still lacking. Such an understanding will be required as the formation is increasingly explored as an unconventional resource play. This study examines the stratigraphy of the interval between the Muddy sandstone and the Frontier Formation, focusing on the Mowry Shale both at outcrop and in the subsurface of the Bighorn Basin of northwestern Wyoming. Detailed measured sections were compiled at outcrop, including acquisition of spectral gamma radioactivity data at 0.5 m spacing to emulate the response of the formation to subsurface wireline logs. Together, these data sets inform a detailed correlation of proximal to distal stratigraphic architectures across the Bighorn Basin. Bentonite beds throughout the succession show high total gamma counts (over 9000 cpm) with a high spectrographic signature from uranium (U) and thorium (Th), but relatively low potassium (K) counts when compared to local mudrocks. Basin floor organic-rich shales and mudrocks are prevalent in the lower parts of the succession, grading upward into platy to blocky, often silicified siltstones with subordinate interbedded sandstone of interpreted prodelta to distal delta front origin. The upper part of the Mowry Shale preserves several sandstone bodies up to 3 meters thick of interpreted delta front origin. Several coarsening upwards cycles are preserved, in places capped by sandy units which are expected to contain the primary reservoir unit within the Mowry Shale. Our data suggest that these sandy zones thicken westward towards what was the emerging Rocky Mountain Highlands and thin distally to the southeast into the Mowry Sea. Data suggest a complex stacking pattern within the study interval with multiple high-frequency sequences recorded, some of which are up to 50 meters thick. Mapping these component intervals facilitates an improved understanding of stratigraphy and reservoir distribution within the Mowry Shale.
Author: Hosny El-Desouky Ahmed Soliman
Publisher:
ISBN:
Category :
Languages : en
Pages : 332
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Author: Edward Allen Merewether
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 104
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Book Description
A multidisciplinary approach to research studies fo sedimentary rocks and their constituents and the evolution of sedimentary basins--both ancient and modern.
Author: Edward Allen Merewether
Publisher: Geological Survey (USGS)
ISBN: 9781411327856
Category : Frontier Formation
Languages : en
Pages : 49
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 246
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Author: John H. Ostrom
Publisher:
ISBN: 9781933789439
Category : Cloverly Formation
Languages : en
Pages : 354
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Book Description
The fiftieth anniversary edition of a landmark publication showcasing prehistoric North American landscapes and ecosystems, from a celebrated paleontologist at Yale University's Peabody Museum.
