Unnamed Gypsum mine  (Woodruff Gypsum), Woodruff, Petrified Forest Mining District, Navajo Co., Arizona, USAi
|Regional Level Types|
|Unnamed Gypsum mine  (Woodruff Gypsum)||Mine|
|Petrified Forest Mining District||- not defined -|
A gypsum occurrence/prospect/mine located in the center sec. 16, T16N, R22E, G&SRM, 2.1 km (1.3 miles) E of Woodruff, on state owned land. The USGS MRDS stated accuracy for this locality is conditionally 1,000 meters.
Mineralization is a lacustrine gypsum deposit (Mineral occurrence model information: Model code: 261; USGS model code: 35b.4 (35b.9); Deposit model name: Lacustrine gypsum), hosted in Late Triassic shale of the Moenkopi Formation. Local rocks include rocks of the Moenkopi Formation.
Workings include unspecified surface openings.
Minor production occurred in the early 1900's.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Colorado Plateau, USA||Plateau|
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: Univ. of AZ Bull. 41 (1916-17), Mineralogy of Useful Minerals in AZ: 39; Stone, R.W. (1920), Gypsum Deposits of the US, USGS Bull. 697: 52; Keith, S.B. (1969), Gypsum, in USGS & AZ Bur. Mines, and US Bur. Of Reclamation 1969, Mineral and water resources of Arizona, AZ Bur. of Mines Bull. 180.
List of minerals arranged by Strunz 10th Edition classification
|Group 7 - Sulphates, Chromates, Molybdates and Tungstates|
|ⓘ||Gypsum||7.CD.40||CaSO4 · 2H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 29 - HYDRATED ACID AND NORMAL SULFATES|
|ⓘ||Gypsum||18.104.22.168||CaSO4 · 2H2O|
List of minerals for each chemical element
|H||ⓘ Gypsum||CaSO4 · 2H2O|
|O||ⓘ Gypsum||CaSO4 · 2H2O|
|S||ⓘ Gypsum||CaSO4 · 2H2O|
|Ca||ⓘ Gypsum||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
|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. 
|Carnian - Anisian|
227 - 247.2 Ma
Age: Triassic (227 - 247.2 Ma)
Stratigraphic Name: Moenkopi Formation
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.