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Las Vegas Wash, Clark Co., Nevada, USA

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Latitude & Longitude (WGS84): 36° 5' 37'' North , 115° 1' 22'' West
Latitude & Longitude (decimal): 36.09369,-115.02281
Köppen climate type:BWk : Cold desert climate

Efforvescences near Duck Creek

Mineral List

9 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Holocene - Late Pleistocene
0 - 0.126 Ma

ID: 2533271
Young fan alluvium

Age: Pleistocene (0 - 0.126 Ma)

Description: Noncemented alluvial-fan gravel and sand with weakly developed soil. Includes Holocene and locally latest Pleistocene (younger than about 15 ka) deposits between modern channels, and depositsin numerous modern channels that are too narrow (less than 30 m) to map separately. Etching on surficial limestone clasts ranges from absent on deposits of modern channels to incipient and sparse to moderately developed and common on deposits between modern channels. Bar-and-swale depositional morphology ranges from prominent modern channels to variably modified and muted by addition of eolian sediment in areas between modern channels. Even in the most muted cases, cobbles and boulders protrude from eolian sand cover, andrelict depositional microrelief is evident on aerial photographs. Desert pavement ranges from absent on deposits in modern channels to loosely packed and weakly developed (especially in areas of relatively low dust-flux, as on the upper part of a fan) to moderately well packed in areas of higher dust flux. Rock varnish, which does not form on most limestone clasts, is generally weakly developed to absent on more siliceous rock types (including siliceous carbonates) except for relict rock varnish not abraded during transport. Typical weak soil developmentis characterized by a cambic Bw horizon, by the presence of non-cemented stage I-II secondary carbonate morphology (mostly thin coats on clast undersides), and by a gradual increase of sand toward the surface through the top 0.5 m of the deposit. The surficial sand component is considered to be pedogenically mixed and infiltrated eolian sand deposited after fluvial deposition of fan gravel. Age control by radiocarbon and thermoluminescence indicates that Qayis predominantly Holocene, and locally as old as 14 ka. Near basin centers, Qay either overlies or is inset within fine-grained deposits with abundant radiocarbon dates ranging from about 8 to 12 ky B.P. (Haynes, 1967; Quade, 1986; Quade and others, 1995; Bell and others, 1998, 1999), so it is likely that most alluvium at the surface of Qay is Holocene. Qay includes deposits correlative to youngest alluvium (Qayy) and older deposits (Qayo). Minimum thickness of Qay ranges from less than 1 m to at least 3 m, as exposed in borrow pits; base of unit is generally not exposed

Reference: Page, W.R., S.C. Lundstrom, A.G. Harris, V.E. Langenheim, J.B. Workman, S.A. Mahan, J.B. Paces, G.L. Dixon, P.D. Rowley, B.C. Burchfiel, J.W. Bell, E.I. Smith. Geologic and Geophysical maps of the Las Vegas 30' X 60' Quadrangle, Clark and Nye Counties, Nevada, and Inyo County, California. USGS Scientific Investigations Map 2814. [85]

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Pliocene - Miocene
2.588 - 23.03 Ma

ID: 2767297
Younger tuffaceous sedimentary rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Horse Camp Formation; Esmeralda Formation; Belted Range Tuff; Timber Mountain Tuff; Paintbrush Tuff; Crater Flat Tuff; Muddy Creek Formation; Siebert Tuff

Description: Tuffaceous and other young Tertiary sedimentary rocks. Most of these rocks are sedimentary with a strong volcanic component - a few are tuffaceous with a strong sedimentary component. This unit includes rocks originally mapped as the High Rock sequence in Washoe County; the Horse Camp Formation in northern Nye County; the Esmeralda Formation in Mineral and Esmeralda Counties; older lake beds in Lincoln County; the Belted Range Tuff; the Indian Trail Formation (now abandoned); Timber Mountain, Paintbrush, and Crater Flat Tuffs; Wahmonie and Salyer Formations in southern Nye County; the Siebert Tuff in Esmeralda County; the Muddy Creek Formation in Clark County; and the Thousand Creek and Virgin Valley “beds” in Humboldt County; and other unnamed units. It corresponds to units Ts3 and Tts from the 1978 State map. It is present in all counties.

Lithology: Major:{sedimentary,volcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Buck, B. J., Wolff, K., Merkler, D. J., & McMillan, N. J. (2006). Salt Mineralogy of Las Vegas Wash, Nevada. Soil Science Society of America Journal, 70(5), 1639-1651.

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