USGS Visual Identifier
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Geologic Unit: Allegheny

Usage:
Allegheny Formation (MD*,OH*,PA*,VA*,WV*)
Allegheny Group (OH,PA*)

Age:
Pennsylvanian, Middle*




Geologic Province:
Appalachian basin*




Areal Extent:
PA*
MD*
OH*
VA*
WV*

Type Locality:
Type area: Exposed in valley of Allegheny River, western PA.

Subunits:
Glen Richey (PA), Laurel Run (PA), Mineral Springs (PA), Millstone Run (PA), Clearfield Creek (PA); Clarion (OH,MD*,PA,WV), Kittanning (PA*), Freeport (PA*,MD, OH*,WV*); Putnam Hill (OH*,PA*); Vanport (PA*,MD*,OH*,WV*); Butler (MD*,PA*), Worthington (MD*,PA*); Washingtonville (OH,PA,WV), Columbiana (OH) [Note to GNC Staff and users: This section needs updating!]

Unit Name History:
Named (Rogers, 1840).
Revised (Graeber and Foose, 1942).
Overview (Rice and others, 1994a; Rice and others, 1994b).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).






U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013