Usage:
Mount Lord Ignimbrite (AZ)
Mount Lord Volcanics (AZ*)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Type section: from sec. 25, T. 11 S., R. 7 E., to W/2 sec. 30, T. 11 S., R. 8 E., West Silver Bell Mountains, Pima Co., AZ (Dockter, 1977).
Reference section: in secs. 15 and 22, T. 11 S., R. 7 E., Pima Co., AZ (Dockter, 1977).
AAPG geologic province:
Basin-and-Range province*
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 ([ ]).