The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.

U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Willow Spring member
  • Modifications:
    • Named
  • Dominant lithology:
    • Volcaniclastics
    • Ash
  • AAPG geologic province:
    • Great Basin province
Publication:

Cook, E.F., 1960, Geologic atlas of Utah, Washington County: Utah Geological and Mineral Survey Bulletin, no. 70, 119 p., (incl. geologic map, scale 1:125,000)


Summary:

Named as basal member of Cove Mountain formation (new) in Washington Co, southwestern UT. Consists of ash and volcanic sedimentary deposits, 0 to 50 ft thick. Underlies Racer Canyon tuff [member] (new) of Cove Mountain formation. Age given as Tertiary.

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 21 May 2026 06:10:18 PM MDT