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- Usage in publication:
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- Douglas Ranch Alloformation
- Modifications:
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- Named
- Dominant lithology:
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- Gravel
- AAPG geologic province:
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- Basin-and-Range province
Summary:
Named for a ranch in its type area, the high mesas south of Gardner Canyon, Santa Cruz Co, AZ in the Basin-and-Range province. Consists of alluvial pediment gravel generally 20 m thick. Overlies Gardner Canyon Alloformation (new). Its age is probably 2.5 to 1.0 m.y., or Pliocene and Pleistocene. Correlated with part of the Saint David Formation. [Definition inadequate; description of its lithology, areal extent, and contacts not completely described.]
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 ([ ]).