File:Arkose (Fountain Formation, Pennsylvanian to Permian; Colorado, USA) 1.jpg

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English: Arkose from the Pennsylvanian of Colorado, USA. (public display, Garden of the Gods visitor center, Colorado Springs, Colorado, USA)

Arkose is a siliciclastic sedimentary rock dominated by clasts of pinkish-orangish colored potassium feldspar. Arkose can be sandstone (~all sand-sized grains) or breccia (poorly sorted, with angular pebbles).

The sample seen here is an arkosic breccia from a thick, Pennsylvanian- to Permian-aged unit in Colorado called the Fountain Formation. It represents an ancient alluvial fan deposit, composed of poorly sorted clastic debris eroded from the Ancestral Rocky Mountains. The type locality is exposures adjacent to Fountain Creek in the town of Manitou Springs in central Colorado. The Fountain Formation there includes arkosic quartzose sandstones, conglomeratic sandstones, granulose sandstones, and breccias. The rocks are muscovitic in part.

Stratigraphy: Fountain Formation, Pennsylvanian to Permian

Locality: unrecorded/undisclosed (but possibly from Garden of the Gods, Colorado Springs, Colorado, USA)
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Source https://www.flickr.com/photos/47445767@N05/49140058191/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49140058191. It was reviewed on 15 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 January 2020

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current22:21, 14 January 2020Thumbnail for version as of 22:21, 14 January 20203,008 × 1,839 (5.68 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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