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National Geologic Map Database

Geologic Unit: Milroy

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 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 ([ ]).