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National Geologic Map Database

Geologic Unit: Troy

Usage:

Troy Quartzite (AZ*)


Subunits:

Chediski Sandstone Member (AZ*).


Geologic age:

Middle Proterozoic*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).