- Usage in publication:
-
- Culbert breccia
- Modifications:
-
- Named
- Dominant lithology:
-
- Breccia
- AAPG geologic province:
-
- Great Basin province
Summary:
Exposed in small patches on east side of Culbert Canyon, for which unit was probably named, and in Comanche Creek drainage, Iron and Washington Cos, UT, Great Basin province. No type locality designated. Composed of angular to subangular blocks of monzonite porphyry, up to 5 ft in diameter, in poorly cemented matrix. Breccia appears to have originated as a mudflow from Stoddard laccolith. Breccia represents remnants of more extensive deposit that caps interfluve divides and clings to valley sides. Ranges to 150 ft thick. Shown on stratigraphic chart to unconformably overlie Pine Valley latite (new); underlie (contact relationship unknown) Parunuweap? formation; and to correlate with Eight Mile dacite (new). Shown on geologic map explanation to overlie Eight Mile and underlie Quaternary basalt flows and cinder cones. Assigned probable Pleistocene age.
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 ([ ]).