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.[2]

Thumb member
Stratigraphic range: Neogene
TypeFormation
Unit ofHorse Spring Formation
UnderliesBitter Ridge Limestone
OverliesRainbow Garden member
Lithology
Primarysandstone
Otherconglomerate, gypsum
Location
Coordinates36°37′30″N 114°56′45″W / 36.62500°N 114.94583°W / 36.62500; -114.94583
RegionNevada
CountryUnited States
Type section
Named forThumb valley north of Lake Mead, Clark Co, NV[1]
Named byChester R. Longwell, 1952[1]

References

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  1. ^ a b "Thumb Member of Horse Spring Formation". 3dparks.wr.usgs.gov. United States Geological Survey. 3 May 2017. Retrieved 14 October 2018.
  2. ^ 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.