- Usage in publication:
-
- Tucson Wash member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Conglomerate
- AAPG geologic province:
-
- Basin-and-Range province
Summary:
Named as upper member of San Manuel formation (new) of Gila group for exposures on southwest side of San Manuel fault and along Tucson Wash, T9S, R16E, Pinal Co, Basin-and-Range province. No type locality designated. Lies disconformably on the erosional surface cut on the underlying Kannally member (new) of San Manuel. Underlies the Quiburis formation (new) of Gila. Consists of dark-gray to purplish-gray boulders of volcanic rocks, quartz monzonite, gray felsite, flow-banded rhyolite, and fragments from the Cloudburst formation. Becomes finer grained to south where it merges into undifferentiated part of San Manuel. Is more than 1,000 ft thick. Is intensely faulted, so accurate thickness not possible. Geologic map. Correlation chart. Block diagrams. Of middle? Tertiary age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Tucson Wash Member*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Basin-and-Range province
Summary:
Age of the Tucson Wash Member of the San Manuel Formation is revised from middle(?) Tertiary --to-- early(?) Miocene based on the revised age for the San Manuel Formation. [Tucson Wash Member not addressed in this report.]
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).