Usage:
No current usage.
(†Portage Group, †Portage Formation, or †Portage Shale (MD,NY,PA,VA,WV) abandoned.)
Geologic age:
Late Devonian
Type section, locality, area and/or origin of name:
Named from superior development along banks of Genesee River in district formerly included in town of Nunda, now Portage, Livingston Co., NY (Hall, 1843).
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 ([ ]).