Geologic Unit: Allegheny
Allegheny Formation (MD*,OH*,PA*,VA*,WV*)
Allegheny Group (OH,PA*)
Type area: Exposed in valley of Allegheny River, western PA.
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 (firstname.lastname@example.org).
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
Database project personnel
Last modified: 15-Jan-2013