Usage:
No current usage.
(†Alton Coal Member, or †Alton Coal Bed, of Pottsville Formation (PA) considered a synonym of Mercer Shale Member of Pottsville Formation. See Mercer.)
Misspelled Alto in US geologic names lexicons, USGS Bull. 896 and 1200.
Geologic age:
Middle Pennsylvanian
Type section, locality, area and/or origin of name:
Notable exposures in Alton basin, Lafayette Twp., McKean Co., central northern PA (Ashburner, 1880).
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 ([ ]).