- Usage in publication:
-
- Tygett Sandstone Member
- Modifications:
-
- Named
- Dominant lithology:
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- Sandstone
- Shale
- AAPG geologic province:
-
- Illinois basin
Summary:
Name formally proposed in this report for middle clastic member of Clore Formation of Elviran age. Consists sandstone and shale. Overlain by Cora Member and underlain by Ford Station Member. Thickness 26 ft at type section.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Tygett Sandstone Member
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Illinois basin
Summary:
Clore Formation in the study area is subdivided into (ascending ) Cora, Tygett Sandstone, and Ford Station Members of Swann (1963). Unit can be correlated in outcrop and subsurface throughout southern IL. Well records show that thickness ranges from 95 to 120 ft in the Eddyville and Stoneford quads., and from 110 to 155 ft in the Creal Springs quad. Tygett Sandstone Member ranges from less than an inch to 20 ft thick in the Eddyville quad and from 15 to 50 ft thick in the Stonefort and Creal Springs quads. Tygett consists mostly of gray silty shale and siltstone to the east, but westward becomes a very fine to fine-grained sandstone. Age is Chesterian.
Source: GNU records (USGS DDS-6; Reston 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 ([ ]).