Usage:
Milroy Member of Loysburg Formation (PA*)
Geologic age:
Middle to Late Ordovician (Chazyan)*
Type section, locality, area and/or origin of name:
[Type area]: Bellefonte to Pleasant Gap, Nittany Valley, Centre Co., central PA (Swartz and others, 1955).
[Probably named from town of Milroy, north of Reedsville, Armagh Twp., Lewistown 15-min quadrangle, Mifflin Co., central PA.]
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 ([ ]).