Facies characteristics of fluviodeltaic strat of the upper Pocahontas formation (Lower Pennsylvanian), Southern West Virginia / by Joseph L. Allen, III.
| Author/creator | Allen, Joseph L. author. |
| Other author | Neal, Donald W., degree supervisor. |
| Other author | East Carolina University. Department of Geology. |
| Format | Theses and dissertations |
| Production | 1990. |
| Description | 115 leaves, 3 unnumbered folded leaves of plates : illustrations ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Summary | Sedimentary strata between the Pocahontas No. 6 coal bed and the lowermost shales of the New River Formation were interpreted using outcrop and subsurface data in Bramwell and Grumpier 7.5' quadrangles. A facies model for the upper Pocahontas Formation was constructed. The study interval comprises a conformable sequence of interbedded sandstone, siltstone, shale, coal, and underclay deposited on an upper delta plain which prograded to the west into the Appalachian foreland basin. The Flattop Mountain Sandstone Member, uppermost unit of the Pocahontas Formation, is a fine- to medium-grained lithic arenite occurring as an ancient fluvial meander belt that pinches out to the north. The unit is similar in appearance and composition to other upper Pocahontas channel sandstones. An abundance of polycrystalline quartz and metamorphic rock fragments indicates a recycled orogen source area to the east. Rocks of the study interval have been divided into two general facies assemblages: a channel belt sandstone and an overbank-floodplain. Assemblages have been subdivided into six objectively defined lithofacies: A) fluvial channel sandstones; B) crevasse splay sandstones and siltstones; C) backswamp-floodplain shales and siltstones; D) leveeoverbank and distal crevasse splay lobe deposits consisting of interlaminated sandstone, siltstone, and shale; E) rooted underclays; and F) coal and carbonaceous black shales deposited in peat swamps. Lithofacies commonly display preferred fining-upward lithic transition cycles characteristic of fluvial deposits. |
| General note | Submitted to the faculty of the Department of Geology. |
| General note | Advisor: Donald W. Neal |
| Dissertation note | M.S. East Carolina University 1990 |
| Bibliography note | Includes bibliographical references (leaves 69-76). |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |
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