Scherr Formation

Scherr Formation Stratigraphic range: Late Devonian
Type	sedimentary
Unit of	Greenland Gap Group
Sub-units	Minnehaha Springs Member
Underlies	Foreknobs Formation
Overlies	Brallier Formation
Thickness	1004 ft at type section
Lithology
Primary	shale
Location
Region	Appalachian Mountains
Extent	Pennsylvania, Maryland, Virginia, West Virginia
Type section
Named for	Scherr, West Virginia
Named by	J. M. Dennison, 1970

The Devonian Scherr Formation is a mapped bedrock unit in Pennsylvania, Maryland, Virginia and West Virginia.

The Scherr Formation consists predominantly of siltstone and shale. Lower part of unit includes considerable fine-grained sandstone, while upper two thirds contains almost no sandstone. It weathers light olive gray.

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.

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.

The Minnehaha Springs Member is a "clastic bundle" consisting of interbedded medium gray siltstone and olive gray shale with some grayish-red siltstone and shale and some sandstone. It is interpreted as turbidites. This same member is proposed to exist at the base of the Scherr's lateral equivalent, the Lock Haven Formation.

Relative age dating places the Scherr in the late Devonian.

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