Usage:
Hammer Creek Formation of Newark Supergroup (PA*)
Hammer Creek Conglomerate of Newark Supergroup (NJ,NY,PA)
Geologic age:
Triassic, Late*
Type section, locality, area and/or origin of name:
Type section: exposures along Hammer Creek, Richland quadrangle, Lebanon Co., PA (Glaeser, 1963).
AAPG geologic province:
Piedmont-Blue Ridge province*
Gettysburg basin*
Newark 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 ([ ]).