Usage:
Gettysburg Formation of Newark Supergroup (MD*,PA*)
Gettysburg Formation of Newark Group (PA)
Subunits:
(alphabetical) --all in PA*: Arendtsville Fanglomerate Lentil, Conewago Conglomerate Member, Heidlersburg Sandstone Member.
Geologic age:
Late Triassic to Early Jurassic*
Type section, locality, area and/or origin of name:
Named from exposures at Gettysburg, Adams Co., southern PA (US geologic names lexicons, USGS Bull. 896, 1200).
Type section (composite): measured sections in and around Gettysburg, Gettysburg 7.5-min quadrangle, Adams Co., central southern PA (GNU records, USGS DDS-6, Reston GNULEX; see Stose and Bascom, 1929).
AAPG geologic province:
Piedmont-Blue Ridge province*
Gettysburg 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 ([ ]).