U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Portage

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 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 ([ ]).