Usage:
Orrs Mills Member of Rondout Formation (NY-recognized locally in type area)
Geologic age:
late Silurian to Early Devonian
Type section, locality, area and/or origin of name:
Type section (composite): upper part exposed in abandoned New York, Ontario, and Western RR cut; lower part on east bank of old limonite pit of Townsend iron mine near Orrs Mills, 4 mi west of Cornwall, NY (Barnett, 1970).
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 ([ ]).