Top Qs
Timeline
Chat
Perspective
Foreknobs Formation
Geological formation in the United States From Wikipedia, the free encyclopedia
Remove ads
The Devonian Foreknobs Formation is a mapped bedrock unit in Pennsylvania, Maryland, Virginia, and West Virginia.
Remove ads
Description
Summarize
Perspective
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.[2]
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.[3]
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.[4]
Remove ads
Rossbach and Dennison (1994) extended the Foreknobs into the Catawba syncline of southwestern Virginia.[5]
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
Remove ads
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
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads