File:Quartzose sandstone (Blakely Sandstone, Middle Ordovician; Coleman Quartz Mine, Arkansas, USA) (8290507503).jpg
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Summary
| Description |
Quartzose sandstone from the Ordovician of Arkansas, USA. (field of view 2.55 cm across) The Ouachita Mountains of Arkansas were formed during the Late Paleozoic Ouachita Orogeny. That mountain forming event was accompanied by the intrusion of hydrothermal quartz veins in some areas. The Coleman Quartz Mine allows for close examination and collection of spectacular quartz crystals from these veins. The rock shown above is quartzose sandstone (quartz arenite) from the Middle Ordovician Blakely Sandstone. Very thin hydrothermal quartz veins (= whitish-gray wisps) of Late Pennsylvanian-Permian age are present throughout the rock. Location: Coleman Quartz Mine, south of Jessieville, northern Garland County, west-central Arkansas, USA (34º 39.700' North, 93º 06.072' West) |
| Date | |
| Source | Quartzose sandstone (Blakely Sandstone, Middle Ordovician; Coleman Quartz Mine, Arkansas, 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@N05/8290507503 (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. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:13, 6 December 2019 | | 793 × 720 (524 KB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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