A bentonite occurrence located in the SE¼ sec. 7 & in secs. 8 & 18, T21N, R16E, G&SRM, 22.9 km (14.2 miles) N of Winslow.
Mineralization is bentonite clay hosted in Late Triassic clay and mud of the Chinle Formation and clastic sedimentary rock. Local rocks include rocks of the Chinle Formation.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Colorado Plateau, USA||Plateau|
|Navajo Nation Indian Reservation, USA||Reservation|
|Hopi-Navajo Indian Reservations, Colorado Plateau, Apache; Navajo and San Juan Cos., Arizona & Utah, USA|
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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
0 - 0.0117 Ma
Age: Anthropocene (0 - 0.0117 Ma)
Description: White to light-red and gray, interbedded silt, sand, and clay, mixed with gravel, pebbles, and cobbles; poorly sorted. Pebbles and cobbles dominantly are angular to rounded, red, white, gray, and black chert clasts; subrounded to rounded red sandstone clasts; and angular to subrounded mafic monchiquite and basanite clasts in Hopi Buttes area. Deposits intertongue with, overlap, or are inset against adjacent surficial deposits (Qa1, Qa2, Qa3, Qv, Qg1, Qg2, QTdi), and they overlap or erode into flood-plain deposits (Qf, Qf1, Qf2, Qf3), ponded sediments (Qps), and mixed alluvium and eolian deposits (Qae). Stream channels subject to high-energy flows and flash-flood debris flows. Little or no vegetation in stream channels except for salt cedar (tamarisk), russian olive, and cottonwood trees along Little Colorado River and several large washes. Contacts with other alluvial deposits are gradational and approximate. Stream-channel deposits of Little Colorado River are mapped as shown on 1:24,000-scale color aerial photographs flown in 2005 (Block and others, 2009). Channel of Little Colorado River meanders within its floodplain valley between Winslow and Leupp. Downstream (northwest) of Leupp, Little Colorado River channel is confined within narrow bedrock strata of the Moenkopi and Kaibab Formations. Thickness, 2 to 9 m (6 to 30 ft)
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. 
|Early Jurassic - Late Triassic|
174.1 - 237 Ma
|Mesozoic sedimentary rocks|
Age: Mesozoic (174.1 - 237 Ma)
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. 
|Norian - Carnian|
208.5 - 237 Ma
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.
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.