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 published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).