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National Geologic Map Database

Geologic Unit: Old Port

Usage:

Old Port Formation (PA*)


Subunits:

(ascending) --all in PA*: New Creek Member, Corriganville Member, Shriver Chert Member, and Ridgeley Sandstone Member.


Geologic age:

Early Devonian*


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

Type section: along a stream and roadcut about 1.5 mi west of Old Port, Mifflintown quadrangle, Juniata Co., central PA. Beginning of section is 2,000 ft south of Lat. 40 deg. 13 min. 15 sec. N., Long. 77 deg. 25 min. 00 sec. W. (Conlin and Hoskins, 1962).


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).