Usage:
Harrell Formation (PA*)
Harrell Shale (MD*,WV*)
Harrell Shale of Susquehanna Group (PA*)
Harrell Shale Member of Fort Littleton Formation of Susquehanna Group (PA)
Subunits:
Burket Shale Member (PA*,MD*,WV*) (at base).
Geologic age:
Late Devonian (Frasnian)*
Type section, locality, area and/or origin of name:
Harrell Station on Petersburg branch of the Pennsylvania RR, about midway between Hollidaysburg and Williamsburg, Blair Co., central PA (Butts, 1918).
AAPG geologic province:
Appalachian basin*
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 ([ ]).