Stratigraphic and geographic distribution of facies in Middle Pennsylvanian Appalachian marine units: Variations on a transgressive-regressive theme
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:6888099
- Hofstra Univ., Hempstead, NY (United States). Dept. of Geology
A single cycle of transgression and regression can be demonstrated in measured stratigraphic sections for each of four Middle Pennsylvanian marine units in the Pocahontas Basin of Kentucky, Virginia, and West Virginia. The transgressive-regressive cycles becomes apparent when the pattern of coarse grained and fine grained facies is diagramed with the occurrences of diagenetic calcium carbonate and siderite. However, the expression of the cycles is highly variables between each of the four marine units. This variability can be shown to be due to differences in the extent and duration of transgression, as well as the geography of the basin during flooding. The Elkins Fork marine unit has the most limited regional extent, and it is the only marine unit that has a transgressive interval with nearly the same sequence of facies as the regressive interval. This is in marked contrast to the Kendrick, Magoffin, and Stoney Fork marine units, which, at most localities, have relatively thin, transgressive intervals of fine-grained, fossiliferous strata, overlain by thick, unfossiliferous, coarsening sequences. The Magoffin marine unit clearly represents a much more extensive transgression than any other marine unit studied. The Magoffin marine unit has the greatest diversity of fossiliferous facies in stratigraphic sequence, indicating a greater depth and variety of marine habitats encountered through the cycle of changing sea level.
- OSTI ID:
- 6888099
- Report Number(s):
- CONF-9404221--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 26:4
- Country of Publication:
- United States
- Language:
- English
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