File:Gyprock (Castile Formation, Upper Permian Eddy County, New Mexico.jpg
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Summary[edit]
| Description |
Horizontally laminated & structurally crinkled gyprock from the Permian of New Mexico, USA. This is a sample of gyprock (rock gypsum), a finely crystalline-textured, chemical sedimentary rock dominated by the mineral gypsum (CaSO4·2H2O - hydrous calcium sulfate). The whitish-gray layers are the gypsum. The dark brown layers are calcite (CaCO3 - calcium carbonate). Gyprock is an evaporite, which forms by the evaporation of water (usually seawater) and the precipitation of dissolved minerals. Small-scale crinkling is present in the specimen. The original outcrop also had small-scale folding and faulting. These features are the result of early Cenozoic structural deformation, not gypsum-to-anhydrite (or vice-versa) transformations (see Anderson & Kirkland, 1987). Stratigraphy: Castile Formation, upper Upper Permian Locality: State Line outcrop, roadcut on either side of Rt. 180/Rt. 62, between Carlsbad Caverns National Park and Guadalupe Mountains National Park, immediately north of the Texas border, southern Eddy County, southeastern New Mexico, USA (32° 00' 34.2" North latitude, 104° 29' 55.0" West longitude) Reference cited: Anderson, R.Y. & D.W. Kirkland. 1987. Banded Castile evaporites, Delaware Basin, New Mexico. Rocky Mountain Section of the Geological Society of America, Centennial Field Guide Volume 2: 455-458. |
| Date | |
| Source | Gyprock (Castile Formation, Upper Permian; State Line outcrop, southern Eddy County, New Mexico, USA) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27727750341. It was reviewed on 21 June 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:27, 21 June 2016 | | 3,992 × 2,163 (4.43 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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