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Erin, Clay Co., Alabama, USA

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Latitude & Longitude (WGS84): 33° 21' 45'' North , 85° 54' 31'' West
Latitude & Longitude (decimal): 33.36250,-85.90861
GeoHash:G#: djfvv17q8
Köppen climate type:Cfa : Humid subtropical climate

6 km west of Pyriton. Mineralization in black slate near the old Erin railroad station and in quartz veins in railroad cuts

Mineral List

5 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

252.17 - 541 Ma

ID: 3187973
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 541 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]

Devonian - Silurian
358.9 - 443.8 Ma

ID: 2923875
Talladega Group; Lay Dam Formation

Age: Paleozoic (358.9 - 443.8 Ma)

Stratigraphic Name: Lay Dam Formation

Description: Interbedded dark-green phyllite, medium-gray to light-brown and black metasiltstone, dark-green feldspathic metagraywacke, and light-gray and dark-gray medium to coarse-grained arkosic quartzite and metaconglomerate; graphitic phyllite common in upper part. In Cleburne and Calhoun Counties, rocks mapped as the Lay Dam include the Abel Gap Formation of Bearce (1973) and consist of interbedded greenish-gray metasiltstone and quartzite, black phyllitic metasiltstone, medium-gray to greenish-gray arkosic quartzite, and dark-gray pyritic quartzite. In Clay Chounty the upper part of the Lay Dam includes black graphitic sericite phyllite and slate reportedly containing plant fossils (Erin Slate Member).

Comments: Printed map has units 'tld' and 'tldd' in one description, split them up here. Secondary unit description from USGS Geologic Names lexicon (ref. AL002: Lay Dam Formation of Talladega Group consists of polymictic greenish-gray thick and irregularly bedded metaclastics (graywacke, siltstone, sandstone, and arkose). May include thin zones of chlorite schist, graphite slate and bluish-gray to grayish-orange silty limestone. Contains quartzite beds and a conglomeratic facies of bouldery metagraywacke with clasts up to 3 ft in diameter in Coosa and Chilton Cos. In Cleburne and Calhoun Cos, the Lay Dam includes rocks previously assigned to the Abel Gap Formation of Bearce (1973), which consist of interbedded greenish-gray metasiltstone and quartzite, black phyllitic metasiltstone, medium-gray to greenish-gray arkosic quartzite, and dark-gray pyritic quartzite. Includes three members: the Miller Mill Quartzite Member, the Erin Slate Member and the Cheaha Quartzite Member. A significant regional angular unconformity is present at the base of the Lay Dam. Age is Silurian(?) to Devonian(?).

Lithology: Major:{phyllite,metaclastic}, Minor:{quartzite}, Incidental:{slate}

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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- Barwood, H. & Hajek, B. (1979): Notes of Some New Occurences in Alabama. Mineralogical Record. 9: 388-391
- Rocks & Min 70:5 pp 320-333

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