- Usage in publication:
-
- Squaw Gulch Granite*
- Modifications:
-
- Named
- Geochronologic dating
- Dominant lithology:
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- Granite
- AAPG geologic province:
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- Basin-and-Range province
Summary:
Named. Type area is along middle reaches of Squaw Gulch, Santa Rita Mountains, Mount Wrightson quad, Santa Cruz Co, AZ. Occurs in much of south-central part of Santa Rita Mountains. Is a coarse-grained and pink granite that forms a large stock. Is myrmekitic and in part granophyric granite to sodic quartz monzonite. Intrudes rocks as young as Triassic Piper Gulch Monzonite. Is unconformably overlain by Early Cretaceous Temporal Formation. Biotite from unit has K-Ar age of 145 +/-4 Ma. Zr was dated by Pb-alpha method as 160 +/-20 Ma and 161 +/-20 Ma. Assigned to the Jurassic.
[NOTE: The Department of the Interior's Secretarial Order 3404, issued on November 19, 2021, formally identifies the term “squaw” as derogatory. That Order will create a federal Derogatory Geographic Names Task Force, to find replacement names for geographic features in use by federal agencies. We’re awaiting guidance from the Task Force, and will then take the appropriate actions.]
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).