Harpers Formation

Harpers Formation
Harpers Formation
Stratigraphic range: Cambrian
	File:Bulletin 799 Plate 8A Harpers Schist.jpg Harpers Schist. Shows older folded schistosity parallel to bedding cut by younger cleavage inclined to bedding.
Type	Metamorphic
Unit of	Chilhowee Group
Sub-units	Snowden Member (VA), Montalto Quartzite Member (PA)
Underlies	Antietam Formation
Overlies	Weverton Formation
Lithology
Primary	Schist
Other	Phyllite, shale
Location
Region	Appalachia, Mid-Atlantic United States, and Southeastern United States
Country	United States
Extent	Maryland, Pennsylvania, Virginia, West Virginia
Type section
Named for	Harpers Ferry, West Virginia
Named by	Arthur Keith (1894)

Photomicrograph of Harpers Schist

The Harpers Formation is a geologic formation in Maryland, Pennsylvania, Virginia, and West Virginia, consisting of schist, phyllite, and shale. It dates back to the early Cambrian period. It is considered part of the Chilhowee Group.

Notable exposures

The Harpers Formation overlies the Ledger Formation (dolomite) due to a thrust fault in small roadside quarry (currently overgrown) on Pottery Hill, southwest of York, Pennsylvania.^[3]

^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
^ Arthur Keith, 1894. Harpers Ferry folio, Virginia, Maryland, West Virginia. United States Geological Survey Geologic atlas of the U.S. Folio 10. Field edition. Washington D.C., engraved and printed by the US Geological Survey. 5p., 5 maps. folio.
^ A. J. Stose and G. W. Stose, 1944. Geology of the Hanover-York district, U. S. Geological Survey Professional paper 204.

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