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*