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Bentonitic clay deposit, Winslow, Winslow Mining District, Navajo Co., Arizona, USAi
Regional Level Types
Bentonitic clay depositOccurrence
Winslow- not defined -
Winslow Mining DistrictMining District
Navajo Co.County
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
35° 8' 45'' North , 110° 30' 27'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Winslow9,600 (2017)21.9km
West Winslow150 (2006)24.4km
LeChee1,443 (2011)25.6km
Winslow West438 (2011)25.6km
Joseph City1,386 (2011)26.4km


A bentonite occurrence located in sec. 11, T20N, R17E, G&SRM, 21.9 km (13.6 miles) NE of Winslow, on private land.

Local rocks include rocks of the Chinle Formation.

Regions containing this locality

North America PlateTectonic Plate
Colorado Plateau, USAPlateau

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Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


No minerals currently recorded for this locality.

List of minerals for each chemical element

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

Early Jurassic - Late Triassic
174.1 - 237 Ma



ID: 3185972
Mesozoic sedimentary rocks

Age: Mesozoic (174.1 - 237 Ma)

Lithology: Sandstone-conglomerate

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]

Late Triassic
201.3 - 237 Ma



ID: 3364695
Petrified Forest Member

Age: Late Triassic (201.3 - 237 Ma)

Stratigraphic Name: Petrified Forest Member

Description: Purple, blue, light-red, red-purple, and gray-blue, slope-forming mudstone and siltstone, interbedded with white to yellow-white, coarse-grained, lenticular sandstone. Includes lenticular alluvial stream-channel features that exhibit large-scale, low-angle trough-crossbedding. Petrified logs and petrified-wood fragments are common in white or yellow-white sandstone beds. Blue and red claystone beds weather into rounded hills or slopes that have rough, puffy, popcorn-like surfaces owing to swelling clay. Contact with the underlying Shinarump Member (^cs) is gradational and is arbitrarily placed at lithologic and topographic change from claystone and siltstone slopes of unit to coarse-grained conglomeritic sandstone ledges of the Shinarump Member. Thickness, 107 to 131 m (350 to 430 ft)

Comments: Chinle Formation (Upper Triassic)—Consists of the Owl Rock, the Petrified Forest, and the Shinarump Members (Repenning and others, 1969)

Reference: Billingsley, G.H., D. Block, and M. Hiza Redsteer. Geologic map of the Winslow 30’ × 60’ quadrangle, Coconino and Navajo Counties, northern Arizona. U.S. Geological Survey Scientific Investigations Map 3247. [200]

Norian - Carnian
208.5 - 237 Ma



ID: 2719040
Chinle Formation

Age: Late Triassic (208.5 - 237 Ma)

Stratigraphic Name: Chinle Formation

Description: Colorful mudstone, such as in the Painted Desert, and less abundant lenses of sandstone and conglomerate, deposited by a large river system. This unit typically is eroded into badlands topography and contains clays that are prone to shrinking and swelling. (210-230 Ma)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

Lithology: Major:{mudstone}, Minor:{sandstone,conglomerate}

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0040170029.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, deposit ID #10283672.
Arizona Department of Mineral Resources, Industrial Mineral Report: 46.

USGS MRDS Record:10283672
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