File:Halite salt casts in friable mudshale (Twist Gulch Formation, Middle Jurassic; float near old, small copper mine on northern side of Salina Canyon, central Utah, USA) (15047117122).jpg
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Halite salt casts in friable mudshale from the Jurassic of Utah, USA. (field of view ~3.5 cm across) One of the most distinctive and environmentally diagnostic (& rare, in my experience) features in the sedimentary record is a halite salt cast. Halite (NaCl - sodium chloride) is a relatively common mineral - it is abundantly preserved in ancient evaporite successions and modern evaporite settings. If seawater-soaked siliciclastic sediments dry out, halite crystals may form. Halite crystals will almost always have nice cubic forms, but they can have embayed faces. This mineral is readily soluble in water, so halite may precipitate and redissolve relatively quickly. The crystal forms may become preserved in the sediments, as casts. Preserved halite salt casts unquestionably demonstrate that the sedimentary environment was an evaporite setting. Stratigraphy: float from the Twist Gulch Formation, Middle Jurassic Locality: loose piece from near small abandoned copper mine at Twist Gulch Formation-Flagstaff Limestone angular unconformity outcrop in Salina Canyon, central Utah, USA |
| Date | |
| Source | Halite salt casts in friable mudshale (Twist Gulch Formation, Middle Jurassic; float near old, small copper mine on northern side of Salina Canyon, central Utah, USA) |
| 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@N05/15047117122 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 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 | 03:56, 6 December 2019 | | 3,008 × 2,000 (1.92 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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