U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Perkasie

Usage:

Perkasie Member of Passaic Formation (NJ*,PA)
Perkasie Member of Brunswick Group (PA*)
Perkasie Member of Brunswick Formation (NJ,PA)


Geologic age:

Triassic, Late*
Norian


Type section, locality, area and/or origin of name:

Not designated. Occurs near the Perkasie tunnel, Bucks Co., PA (Lyman, 1895).


AAPG geologic province:

Piedmont-Blue Ridge province*
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 ([ ]).