Lithofacies Study of Upper Pennsylvanian and Lower Permian Rocks in Northwestern Kansas and Adjacent Areas PDF Download
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Author: Sidney N. Hockens
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Languages : en
Pages :
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Author: Sidney N. Hockens
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Languages : en
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Author: Keith S. McMurray
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Category :
Languages : en
Pages :
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Category : Geology
Languages : en
Pages : 616
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Author: Geological Survey (U.S.)
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Category :
Languages : en
Pages : 604
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Author:
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Category : Geology
Languages : en
Pages : 658
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Author: Melvin R. Fudge
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Category : Geology
Languages : en
Pages : 410
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Author: Tucker F. Hentz
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ISBN: 9781970007107
Category :
Languages : en
Pages : 68
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Our study documents the shelf, shelf-edge, slope, and basin-floor depositional facies characteristics, stratigraphic variations, and sedimentation trends of the Missourian Canyon Group and Virgilian-Wolfcampian Cisco Group across the southern Eastern Shelf and the adjacent Midland Basin. The Canyon Group (base Palo Pinto Limestone to top Home Creek Limestone) consists of an aggradational carbonate bank succession having locally prominent reef facies. Similar reef facies continued to accumulate during early Cisco sedimentation. The bank/reef interval, largely equivalent in age to the Horseshoe Atoll complex, is as much as 1,540 ft (469 m) thick in northeastern Coke County and forms an irregular, but distinct, shelf margin throughout the eastern part of the study area. Reef buildups are generally aligned at the margin but also occur as local pinnacles in the platform interior. Canyon basin-floor facies are equivalent to the lower part of the Cline shale ("Wolfcamp D") and consist primarily of dark, organic-rich (>2 percent organics) mudrocks. The overlying Cisco section comprises a series of 13 mudrock, limestone, and sandstone cycles (top Home Creek Limestone to top Coleman Junction Limestone), correlated from outcrop, that collectively form a progradational succession extending from the eastern edge (Bunger Limestone) to the central part of the study area (Coleman Junction Limestone). The top of the Home Creek Limestone coincides with a regional downlap surface for the progradational Virgilian lower Cisco shelf strata. Progressive upward decrease in height of shelf-margin clinoforms indicates that accommodation had markedly decreased during deposition of the upper Cisco Group. The Pennsylvanian-Permian (Virgilian-Wolfcampian) boundary is at the top of the Cline shale in the basin and slope provinces and just above the Crystal Falls Limestone in the shelf area. The thickness of the Wolfcampian section is regionally consistent at the shelf (~700 to 850 ft [~213 to 259 m]), expands markedly basinward to as much as 3,500 ft (1,067 m) into a regional depocenter of high accommodation and high sediment influx associated with slope sedimentation, and then thins into the basin proper (to
Author: Henry Lee Berryhill
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Category :
Languages : en
Pages : 57
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Author: George Clinton Swallow
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Category : Fossils
Languages : en
Pages : 40
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Author:
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Category :
Languages : en
Pages : 960
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