Usage:
No current usage.
(†Alton Coal Member, or †Alton Coal Bed, of Pottsville Formation (PA) considered same as Mercer Shale Member of Pottsville Formation. See Mercer.)
Misprinted 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 ([ ]).