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Characteristics of the Mid-Carboniferous Boundary and by William E. Edmunds, Jane R. Eggleston(auth.)

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By William E. Edmunds, Jane R. Eggleston(auth.)

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Published via the yank Geophysical Union as a part of the Field journey Guidebooks Series.

within the northern Appalachians, the boundary among the Mississippian and Pennsylvanian platforms falls inside of a fancy sedimentary series unfold throughout a rapidly-subsiding depositional trough and an adjoining, extra good craton margin. Sediment resource components lie in a more-or-less non-stop semicircle from southeast to north of the basin. moreover, the higher Mississippian-Lower Pennsylvanian series is interrupted through huge erosion regarding epeirogenic upwarping of the sector. Biostratigraphically, the systemic boundary is positioned on the first prevalence of the floral shape Neuropteris pocahontas (D. White) of floral sector four as outlined via learn and Mamay (1964). even if, as a result of common disconformable nature of the touch, the basal Pennsylvanian plants is usually more youthful.

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Additional resources for Characteristics of the Mid-Carboniferous Boundary and Associated Coal-Bearing Rocks in the Appalachian Basin: Morgantown, West Virginia to Chattanooga, Tennessee, July 19-27, 1989

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Gray to white, shale clasts, siderite nodules, plant fragments~ Carbonaceous shale, silty to clayey, gray-black, plant fragments, Brookville* coal equivalent. -grained, It. gray to white, minor grayish pink, well sorted, hard, siliceous, thick-bedded, planar bedding with some low-angle crossbeds, some shale clasts and dark mineral zones. -grained with lower 3 m coarse- to v. -olive-gray, planar-bedded with some wedging, cut-and-fill, lowangle and festoon crossbeds (most common in lower 6 m), dark mineral zones, incised lower boundary.

The overlying red member is a sequence of mostly grayish-red, partly calcareous shale and siltstone deposited in a tidal-flat environment associated with fresh-water marshes. It also contains several thin beds of coal, underclay, and nodular argillaceous limestone. The Bramwell Member, the youngest Mississippian strata in the Bluestone, was deposited during marine transgression across the lower coastal plain underlain by the red member. Carbonaceous shale containing fresh- and brackish-water faunas, found at the base of the Bramwell, grades upward to silty shale and calcareous siltstone that contain thin limestone beds and highly diverse marine faunas.

A:: w a.. a.. J 2 FIGURE 3 Relationship of formations and floral zones (Read and Mamay, 1964; Gillespie and Pfefferkorn, 1977) to the Mississippian-Pennsylvanian boundary. Pocahontas Formation, the uppermost beds of the Bluestone Formation also are eroded, and the disconformity at the base of the New River coincides with the widespread Mississippian-Pennsylvanian unconformity (fig. 3). The New River Formation ranges in thickness from 244 m (800 ft) along the New River, in the type area in western Fayette County, West Virginia, to about 305 m (1,000 ft) in the easternmost outcrops.

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