Usage:
Harpers Formation of Chilhowee Group (MD*,PA*,VA*,WV*)
Harpers Phyllite of Chilhowee Group (MD*,PA*)
Harpers Schist (PA*)
Harpers Shale of Chilhowee Group (VA*,WV*)
Harpers Formation (MD)
Subunits:
Snowden Member (VA*); Montalto Quartzite Member (PA*)
Geologic age:
Early Cambrian*
Type section, locality, area and/or origin of name:
Exposures in gorges of Potomac and Shenandoah Rivers at Harpers Ferry, east-central WV (Keith, 1894).
AAPG geologic province:
Piedmont-Blue Ridge province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).