Usage:
Portal Formation (AZ*,NM)
Geologic age:
Late Devonian
Type section, locality, area and/or origin of name:
Type section: about 2 mi northwest of village of Portal, Cochise Co., southeastern AZ. Exposed in SW/4 sec. 14, T. 17 S., R. 31 E., where formation forms ridge between Round Valley on north and Silver Creek on south. Named from Portal (Sabins, 1957).
AAPG geologic province:
Pedregosa 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 ([ ]).