- Usage in publication:
-
- Sixmile Canyon formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Sandstone
- Conglomerate
- AAPG geologic province:
-
- Wasatch uplift
Summary:
Named as the upper formation (of four formations) of the Indianola group (new). Probably named for Sixmile Canyon (though not stated), Sanpete Co, UT, Wasatch uplift. No type locality designated. Occurs only on the Wasatch Plateau. Consists of coarse-grained gray sandstone and conglomerate. Divisible into 1) a lower gray conglomeratic sandstone 2,000 ft thick, 2) middle coal-bearing, gray to cream and white, mostly fine grained sandstone, gray to white shale, carbonaceous shale, and coal about 300 ft thick, and 3) upper conglomerate and conglomeratic sandstone 425 ft exposed. Overlies the newly named Funk Valley formation of the Indianola. Unconformably (angular) underlies Price River formation. Fossil plants and mollusks from coal-bearing member are Colorado age. Formation may be as young as early to middle Montana or Late Cretaceous age. Stratigraphic table.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Sixmile Canyon Formation*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Wasatch uplift
Summary:
Palynomorph assemblage in coal indicative of a latest Santonian to earliest Campanian age. Name replaces use of South Flat Formation, a term abandoned in this report, in the Wasatch uplift.
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 ([ ]).