Usage:
Zoroaster Granite (AZ)
Zoroaster Complex (AZ)
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Well exposed by narrow canyon of Zoroaster Creek, Grand Canyon region. Granite cuts across, at steep angle, the nearly vertical schistocity of the country rocks. Contact best exposed on south side of Colorado gorge (Campbell and Maxon, 1936).
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 ([ ]).