Английская Википедия:Foreknobs Formation
Шаблон:Short description Шаблон:Infobox rockunit The Devonian Foreknobs Formation is a mapped bedrock unit in Pennsylvania, Maryland, Virginia, and West Virginia.
Description
The Foreknobs Formation contains massive sandstones; siltstone; "redbeds" of brownish-gray sandstone, siltstone, and shale containing scattered marine fossils; and occasional quartz-pebble conglomerate or conglomeratic sandstone beds.[1]
Stratigraphy
Dennison (1970) renamed the old Chemung Formation the Greenland Gap Group and divided it into the lower Scherr Formation and the upper Foreknobs Formation. De Witt (1974) extended the Scherr and Foreknobs into Pennsylvania, but did not use the term Greenland Gap Group.[2]
Boswell, et al. (1987), does not recognize the Scherr and Foreknobs Formations in the subsurface of West Virginia and thus these formations are reduced from "group" to "formation" as the Greenland Gap Formation.[3]
Rossbach and Dennison (1994) extended the Foreknobs into the Catawba syncline of southwestern Virginia.[4]
The Foreknobs is divided into the following Members, in ascending order: Mallow Member, Briery Gap Sandstone Member, Blizzard Member, Pound Sandstone Member, and Red Lick Member
Fossils
Red beds within the Foreknobs contain scattered marine fossils, such as brachiopods.
Notable Exposures
Type section: along WV Highway 42, 0.48 km northwest of Scherr, Grant County, West Virginia
Age
Relative age dating places the Foreknobs in the Late Devonian.
References
Шаблон:Chronostratigraphy of Maryland Шаблон:Chronostratigraphy of Virginia Шаблон:Stratigraphic column of West Virginia
Шаблон:Maryland-geologic-formation-stub
- ↑ Dennison, J.M., 1970, Stratigraphic divisions of Upper Devonian Greenland Gap Group ("Chemung Formation") along Allegheny Front in West Virginia, Maryland, and Highland County, Virginia: Southeastern Geology, v. 12, no. 1, p. 53-82.
- ↑ de Witt, Wallace, Jr., 1974, Geologic map of the Beans Cove and Hyndman quadrangles and part of the Fairhope quadrangle, Bedford County, Pennsylvania: U.S. Geological Survey Miscellaneous Investigations Series Map, I-801, 6 p., 1 sheet, scale 1:24,000
- ↑ Boswell, R.M., Donaldson, A.C., and Lewis, J.S., 1987, Subsurface stratigraphy of the Upper Devonian and Lower Mississippian of northern West Virginia: Southeastern Geology, v. 28, no. 2, p. 105-131.
- ↑ Rossbach, T.J., and Dennison, J.M., 1994, Devonian strata of Catawba syncline, near Salem, Virginia, IN Schultz, Art, and Henika, Bill, Fieldguides to Southern Appalachian structure, stratigraphy, and engineering geology: Virginia Polytechnic Institute and State University, Department of Geological Sciences Guidebook, Geological Society of America, Southeastern Section, Annual Meeting, Blacksburg, VA, April 7–9, 1994, no. 10, p. 95-126.
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- Sandstone formations of the United States
- Shale formations of the United States
- Siltstone formations
- Devonian Maryland
- Devonian geology of Pennsylvania
- Devonian geology of Virginia
- Devonian West Virginia
- Geologic formations of Maryland
- Geologic formations of Pennsylvania
- Geologic formations of Virginia
- Geologic formations of West Virginia
- Devonian southern paleotemperate deposits
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