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National Geologic Map Database

Geologic Unit: Stonehenge

Usage:

Stonehenge Limestone of Beekmantown Group (MD*,NJ*,PA*,VA*,WV*)
Stonehenge Formation of Beekmantown Group (NJ*,NY*,PA*)


Subunits:

Stoufferstown Member (MD*,WV*,VA*)


Geologic age:

Cambrian, Late(?)*
Ordovician, Early*
Ibexian, early*
Tremadocian*


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

Type section: on Hoover Farm just north of U.S. Route 30, 2 mi southeast of center of Chambersburg, Franklin Co., PA (Sando, 1956).
Reference sections:
(1) begins in pasture northeast of barn on Forsythe Farm located 1 mi S. 5 deg. E. of St. Paul's Church, Washington Co., MD (Sando, 1957);
(2) along northwest bank of Schuylkill River in borough of Glenside, a suburb of Reading, Berks Co., PA (Hobson, 1957).
Notable exposures at Stonehenge, Franklin Co., PA (Stose, 1908, 1909).


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 ([ ]).