| Thumb member | |
|---|---|
| Stratigraphic range: Neogene | |
| Type | Formation |
| Unit of | Horse Spring Formation |
| Underlies | Bitter Ridge Limestone |
| Overlies | Rainbow Garden member |
| Lithology | |
| Primary | sandstone |
| Other | conglomerate, gypsum |
| Location | |
| Coordinates | 36°37′30″N 114°56′45″W / 36.62500°N 114.94583°W / 36.62500; -114.94583 |
| Region | Nevada |
| Country | United States |
| Type section | |
| Named for | Thumb valley north of Lake Mead, Clark Co, NV |
| Named by | Chester R. Longwell, 1952 |
The Thumb member of the Horse Spring Formation is a geologic formation in Nevada. It contains sandstone with beds of conglomerate and gypsum in the Neogene period.
References
- ^ "Thumb Member of Horse Spring Formation". 3dparks.wr.usgs.gov. United States Geological Survey. 3 May 2017. Retrieved 14 October 2018.
- Joseph V. Tingle; Becky W. Purkey; Ernest M. Duebendorfer; Eugene I. Smith; Jonathan G. Price; Stephen B. Castor (1 March 2002). Geologic Tours in the Las Vegas Area - Expanded Edition. Nevada Bureau of Mines and Geology Special Publication. University of Nevada, Reno. p. 57. ISBN 978-1-888035-07-0. OCLC 48248626. OL 3625640M. Wikidata Q57313732.
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