Harpers Formation

Harpers Formation
Stratigraphic range: Cambrian
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,[1] West Virginia
Type section
Named for	Harpers Ferry, West Virginia
Named by	Arthur Keith (1894)[2]

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 type section is in gorges of the Potomac River and the Shenandoah River at Harpers Ferry, West Virginia.

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]

Gallery

• 
  Quartzite sample of Harpers Formation from near Verona, Virginia
• 
  Harpers Shale by Jefferson Rock in Harpers Ferry, West Virginia
• 
  Sample of phyllite from the outcrop at Pottery Hill, southwest of York

References

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