File:Southern San Rafael Fremont Indian petroglyph (~400 to ~1350 A.D.) (Capitol Reef National Park, southern Utah, USA) 7 (22700142310).jpg

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Bighorn sheep - Southern San Rafael Fremont Indian petroglyph (~400 to ~1350 A.D.) on desert varnish-covered quartzose sandstone (Wingate Sandstone, Lower Jurassic) in Utah.

The reddish-brown portions of the rock face are desert varnish - a mineral-encrusted rock surface that is common in many desert settings. Desert varnish is composed of clay minerals and red-colored hematite (Fe2O3 - iron oxide). Some desert varnish surfaces are blackish-colored from manganese oxide minerals (for example, birnessite - www.mindat.org/min-680.html). Scraping or hammering away at the desert varnish exposes the light-colored sandstone.

Note also the tourist graffiti from the 1910s and 1940s.

Locality: cliff face ~0.4 kilometers northeast of the Sulphur Creek-Fremont River confluence, Capitol Reef National Park, southern Utah, USA
Date Taken on 2 September 2011, 17:47
Source Southern San Rafael Fremont Indian petroglyph (~400 to ~1350 A.D.) (Capitol Reef National Park, southern Utah, USA) 7
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@N05/22700142310. It was reviewed on 3 December 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 December 2015

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current21:36, 3 December 2015Thumbnail for version as of 21:36, 3 December 20152,313 × 1,495 (3.61 MB)Basilicofresco (talk | contribs)Transferred from Flickr via Flickr2Commons

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