- Usage in publication:
-
- Skunk Spring Limestone Member
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Great Basin province
Summary:
Named as 2nd from lowermost of six members of Chainman Formation along NV-UT boundary. Is marker bed, 15 ft thick. Overlies Needle Siltstone Member; underlies Camp Canyon Member (both new and of Chainman Formation). Age of Chainman Formation is Late Mississippian based on faunal zone analysis.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Skunk Spring Limestone Bed*
- Modifications:
-
- Revised
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Great Basin province
Summary:
Assigned as a bed in the concretionary shale member of the Chainman Shale. Was named for Skunk Spring Canyon in sec 9, T18S, R16W, Millard Co, UT in the Great Basin province. Overlies Needle Siltstone Member (first used) of the Chainman. Underlies the phosphatic calcareous shale of the upper part of the concretionary shale member of the Chainman. Has a sparse conodont fauna of late Meramecian age. This micritic limestone is 13.1 ft thick. Considered to be a deep water starved-basin deposit. Columnar sections. Meramecian, Late Mississippian age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Skunk Spring Limestone Bed*
- Modifications:
-
- Mapped 1:24k
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Great Basin province
Summary:
Is mapped as a bed (Meramecian) of the Chainman Formation (Mississippian) in Mountain Home Range in western Millard Co, southwest UT (Great Basin province). Subdivisions of the Chainman mostly follow Sadlick (1965) with addition of two members below his Needle Member. Sandberg and others (1980) have listed conodont zones using Sadlick's subdivisions. Overlies Needle Siltstone Member (Meramecian) of the Chainman. Overlain by black shale unit (Chesterian and Meramecian) of the Camp Canyon Member of the Chainman. Map unit described as limestone, medium gray, silty, thick bedded at base, becoming thin bedded at top; forms conspicuous ledge where not buried; about 2 m thick.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Skunk Spring Limestone Member*
- Modifications:
-
- Mapped 1:24k
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Great Basin province
Summary:
Is mapped as a member (Meramecian) of the Chainman Formation (Mississippian) in southern part of the Mountain Home Range in western Millard and Beaver Cos, southwest UT (Great Basin province). Subdivisions of the Chainman mostly follow Sadlick (1965, 1966) with addition of Delle Phosphatic Member (Sandberg and Gutschick, 1984) at base of formation. Sandberg and others (1980) have listed Chainman conodont zones using Sadlick's subdivisions. Overlies Needle Siltstone Member (Meramecian) of the Chainman. Overlain by black shale unit (Chesterian and Meramecian) of the Camp Canyon Member of the Chainman. Map unit described as medium gray silty limestone, thick-bedded at base, thin-bedded at top; locally forms conspicuous ledge; about 2 m thick.
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 ([ ]).