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National Geologic Map Database

Geologic Unit: Hatter

Usage:

Hatter Formation of Black River Group (PA*)
Hatter Limestone of Black River Group (PA*)
Hatter Formation (PA, and WV-subsurface)


Subunits:

FORMATION STATUS (alphabetical) --all in PA: Eyer Limestone Member or Eyer Member, Grazier Member, Hostler Limestone Member or Hostler Member.


Geologic age:

Late Ordovician (Mohawkian; Turinian)*


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

Type section: Hatter Creek, north of Roaring Spring, Blair Co., PA, and Pennsylvania RR cut, Union Furnace, Huntingdon Co., PA (Kay, 1944).


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 ([ ]).