The Pleasanton Group (Upper Pennsylvanian) in Kansas
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Abstract:
he Pleasanton Group, a span of rocks that is mostly shale but includes some sandstone, limestone, and coal, is described as it occurs in its belt of outcrop in eastern Kansas. These rocks, which for several years previous to 1948 were called the "Bourbon Group," are of early Missourian age (Upper Pennsylvanian). The Group comprises, in ascending order, the Seminole Formation, the Checkerboard Limestone, and the Tacket Formation (a new stratigraphic name introduced in this paper). Another new name, South Mound Shale Member, is introduced for the upper member of the Seminole Formation, whose lower member is the Hepler Sandstone. A thick sequence of dark limestone and shale beds, known as "Bourbon flags" and some lenticular sandstone bodies (Knobtown sandstone) are characteristic of facies of the Seminole-Tacket formations, the name applied to the entire span of Pleasanton rocks in the northern part of its outcrop area where the separating Checkerboard Limestone is not identified.Cite
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The weathering and truncation of the Pre~Pennsylvanianrocks of the Arbuckle Mountain region seems to have been the source for some of the sediments carried into the Ardmore basis during the Pennsylvanian period. These sediments have a thickness of approximately 18,000 feet and have also suffered considerable folding during and into late Pennsylvanian time. The major bulk of the sediments are shales, but samples were collected for special stUdy from some of the sandstone exposures which occur at rather convenient intervals in the lower, middle and upper portions of the Pennsylvanian section.
Tourmaline
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Deposition of the complex sedimentary facies in the Allegheny basin exhibits a change in the dominant source of sediment influx from north to southeast through Pennsylvanian time. Lobate deltas entered eastern Ohio from both the rising Appalachian Mountains to the east and southeast and from the Canadian shield to the north. Confusion exists regarding the limits of the respective deltas. The present study is an attempt to define the limits of these sedimentary domains for a small portion of the basin in space and time. Samples of the upper Freeport (Upper Desmoinesian) and Mahoning (Lower Missourian) sandstones were collected along their western outcrop through eastern Ohio from Summit to Gallia Counties along a north-south transect. Thin sections were point-counted and a alyses of the data made to determine whether the individual samples had their source in the high-grade metamorphic and igneous crystalline basement of the Canadian shield, or among the sedimentary and low-grade metamorphic rocks of the Appalachians. Determination of the source of the samples allows delineation of the boundary between respective delta lobes. End_of_Article - Last_Page 1166------------
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Middle and Upper Pennsylvanian beds of Texas are well known and are subdivided into a series of formations on the basis of lithology and fossils. The Lower Pennsylvanian, however, which outcrops in central Texas is more complex. Recent field work has distinguished three formations, one of which is subdivided into four members. These are briefly described and lists of characteristic fossils are presented.
Outcrop
Lithology
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Section (typography)
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A possible glacial boulder of undeformed and unmetamorphosed siltstone containing Middle Pennsylvanian plant fossils was recovered from the Bronx. The rock cannot be explained by known geologic relations and suggests the possibility of undetected outliers of Pennsylvanian rocks in the Hudson valley.
Siltstone
Phyllite
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