Fort Apache Gypsum deposit (Ft. Apache gypsum deposit), Show Low, Navajo Co., Arizona, USAi
|Regional Level Types|
|Fort Apache Gypsum deposit (Ft. Apache gypsum deposit)||Deposit|
A surface gypsum deposit located in the center sec. 31, T9N, R22E, G&SRM, 21.8 km (13.6 miles) S of Show Low and 17.8 km (11.1 miles) W of McNary (Apache County). According to the USGS MRDS database file #10023686 this is an estimated location, probably within 0.5 mile.
The ore beds are an average 12.19 meters thick (gypsum and gypsiferous beds are 1 foot to 40 feet thick). Local rocks include Oligocene to Paleocene[?] sedimentary rocks and/or Cretaceous sedimentary rocks.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Fort Apache Indian Reservation, Arizona, USA||Reservation|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
1 valid mineral.
Detailed Mineral List:
| ⓘ Gypsum|
Formula: CaSO4 · 2H2O
Reference: Phillips, K.A. (1987), Arizona Industrial Minerals AZ Dept. of Mines and Mineral Resources Mineral Rpt. 4.
|ⓘ Gypsum var: Selenite|
Formula: CaSO4 · 2H2O
Reference: Dennis Tryon collection
List of minerals arranged by Strunz 10th Edition classification
|Group 7 - Sulphates, Chromates, Molybdates and Tungstates|
|ⓘ||Gypsum||7.CD.40||CaSO4 · 2H2O|
|ⓘ||var: Selenite||7.CD.40||CaSO4 · 2H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 29 - HYDRATED ACID AND NORMAL SULFATES|
|ⓘ||Gypsum||188.8.131.52||CaSO4 · 2H2O|
|Unclassified Minerals, Mixtures, etc.|
|ⓘ||var: Selenite||-||CaSO4 · 2H2O|
List of minerals for each chemical element
|H||ⓘ Gypsum||CaSO4 · 2H2O|
|H||ⓘ Gypsum (var: Selenite)||CaSO4 · 2H2O|
|O||ⓘ Gypsum||CaSO4 · 2H2O|
|O||ⓘ Gypsum (var: Selenite)||CaSO4 · 2H2O|
|S||ⓘ Gypsum||CaSO4 · 2H2O|
|S||ⓘ Gypsum (var: Selenite)||CaSO4 · 2H2O|
|Ca||ⓘ Gypsum||CaSO4 · 2H2O|
|Ca||ⓘ Gypsum (var: Selenite)||CaSO4 · 2H2O|
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
|Rupelian - Danian|
28.1 - 66 Ma
|Oligocene to Paleocene[?] sedimentary rocks|
Age: Paleogene (28.1 - 66 Ma)
Stratigraphic Name: Chuska Sandstone
Description: "Rim gravels". Light colored, weakly to moderately consolidated conglomerate and sandstone deposited largely or entirely before mid-Tertiary volcanism and extensional faulting. Most sediment was deposited by early Cenozoic streams that flowed northeastward onto the Colorado Plateau from areas to the southwest that are now lower in elevation than the Plateau. Sediments of this map unit, other than the Chuska Sandstone in northeasternmost Arizona, are commonly referred to as "rim gravels" because they now rest on or near the Mogollon Rim, which is the southwestern edge of the Colorado Plateau. (30-65 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. 
251.902 - 298.9 Ma
|Paleozoic sedimentary rocks|
Age: Phanerozoic (251.902 - 298.9 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.