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National Geologic Map Database

Geologic Unit: Mahantango

Usage:

Mahantango Formation (MD*,PA*,VA,WV*)
Mahantango Formation of Hamilton Group (PA*)


Subunits:

(alphabetical): Backbone Ridge Siltstone Member (PA), Chaneysville Siltstone Member (MD,PA,WV), Clearfield coral bed (PA; informal term not included in this lexicon -see 1960 State Geol. Map), Clearville Member (PA) or Clearville Siltstone Member (MD,PA,WV), Dalmatia Member (PA), Donation Siltstone Member (PA), Fisher Ridge Member (PA), Fort Hunter Sandstone Member (PA), Gander Run Shale Member (PA), Knobsville Beds (PA), Landes Limestone Member (PA), Nis Hollow Siltstone Member (PA*), Pokejoy Member (WV*,MD*,PA), Sherman Ridge Member (PA), Tully Member (PA*), Turkey Ridge Sandstone Member (PA).


Geologic age:

late Middle Devonian (Givetian)*


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

Exposures in valley, North Branch of Mahantango Creek, Snyder Co., central PA (Willard, 1935).


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 ([ ]).