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National Geologic Map Database

Geologic Unit: Bald Hill

Usage:

Bald Hill Bentonite Beds (MD,NY,PA,VA,WV)


Geologic age:

Early Devonian


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

Type section: exposures in roadcut, north side of U.S. Route 22, 1.7 km east of Hollidaysburg, Frankstown Twp., Blair Co., central PA (Smith and Way, 1988).


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 ([ ]).