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Harpers Formation

Harpers Formation (Chilhowee Group) - greenish-gray phyllite, with interbeds of fine-grained quartzite.
State West Virginia
Name Harpers Formation
Geologic age Cambrian
Comments Thickness: Northeastern 1200 ft, Southeastern - Chilhowee Group 1200 ft (estimate only).
Primary rock type phyllite
Secondary rock type quartzite
Other rock types
Lithologic constituents
Metamorphic > Metasedimentary > Metaclastic > Phyllitegreenish-gray phyllite
Metamorphic > Metasedimentary > Metaclastic > Quartzitewith interbeds of fine-grained quartzite.
Map references
Digital version of 1968 printed map available from with the specific data available from
Unit references
Cardwell, D.H., Erwin, R.B., and Woodward, H.P., 1968 (slightly revised 1986), Geologic Map of West Virginia: West Virginia Geological and Economic Survey, Map 1, East Sheet, scale 1:250,000.
Counties Jefferson