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- W323259804 abstract "The Lower Pennsylvanian Pottsville Formation in the Warrior coal basin of Alabama consists of a southwestward-thickening wedge of clastic sediments. Stratigraphic subdivision of this formation is difficult because of complex facies changes. In 1900, McCalley used the more continuous coal beds and sandstone units to separate the formation into two general subdivisions; a lower sequence composed predominantly of sandstone and siltstone, and an upper sequence of shale, siltstone, and the major coal beds in the basins. The upper sequence was further subdivided into seven coal groups. One of the thicker and more complex parts of the upper Pottsville is the Pratt coal group and the interval of clastic sediments between it and the underlying Mary Lee coal group. The intragroup strata are 45 to 110m thick and represent two distinctly different environmental sequences. The basal sequence (10 to 65m thick) consists of horizontal to lenticular rippled laminae of shale, siltstone and some thin-bedded, fine-grained sandstone deposited in shallow marine bay to pro-delta environment. The upper sequence (10 to 45m thick) consists of interbedded siltstone and fine-grained sandstone and also numerous thick- to massive-bedded, fine- to coarse-grained trough cross-bedded sandstone units deposited in a delta front to distributary channel environment. Themore » coal beds of the overlying Pratt group were deposited in association with lower to transitional delta plain sediments as part of a distributary system that was prograding from the east or southeast toward the west or northwest.« less" @default.
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- W323259804 title "Depositional environments of the Pratt-Mary Lee intragroup clastic sequence in the Lower Pennsylvanian Pottsville Formation, Warrior coal basin, Alabama" @default.
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