- Usage in publication:
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- Claflin Ranch Formation*
- Modifications:
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- Overview
- AAPG geologic province:
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- Basin-and-Range province
Summary:
Is oldest Upper Cretaceous formation in Silver Bell Mountains (Pima Co, AZ) in Basin-and-Range province. Presumably overlies unnamed arkosic sedimentary rocks of probable Early Cretaceous age. Underlies Silver Bell Formation (Campanian) of Richard and Courtright (1960). Is considered roughly correlative with Fort Crittenden Formation. Age is shown as Late Campanian (Late Cretaceous) on correlation chart (fig. 5).
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 ([ ]).