Usage:
Troy Quartzite (AZ*)
Subunits:
Chediski Sandstone Member (AZ*).
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Named from Troy Mountain, Dripping Spring Range, Pinal Co., AZ (Ransome, 1915).
Reference section: in secs. 16, 21, and 22, T. 6 N., R. 14 E., where Troy is 1,198 ft thick (Shride, 1967).
AAPG geologic province:
Southwestern Basin-and-Range region*
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 ([ ]).