File:Agate in chert (Rex Chert Member, Phosphoria Formation, Permian; Astoria Hot Springs roadcut, Teton County, Wyoming, USA) 1 (49192509272).jpg

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Agate in chert in the Permian of Wyoming, USA.

Chert is a cryptocrystalline, quartzose sedimentary rock. It can occur as bedded chert or as nodules or nodule horizons. Chert can also partially replace rocks - often limestone.

Seen here is a dark-colored chert mass eroded from the Permian-aged Rex Chert Member of the Phosphoria Formation in Wyoming. The lighter-colored areas in the chert are true agate - irregularly-concentric layers of chalcedony (= microscopic fibrous quartz) that fill former cavities.

Stratigraphy: float from the Rex Chert Member, Phosphoria Formation, Roadian Stage to Wordian Stage, lower Guadalupian Series, mid-Permian

Locality: roadcut on the northern side of Route 26/Route 89 at the town of Astoria Hot Springs, Snake River Canyon, southern Teton County, northwestern Wyoming, USA
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Source Agate in chert (Rex Chert Member, Phosphoria Formation, Permian; Astoria Hot Springs roadcut, Teton County, Wyoming, USA) 1
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@N05/49192509272 (archive). It was reviewed on 10 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 December 2019

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current01:39, 10 December 2019Thumbnail for version as of 01:39, 10 December 20193,331 × 2,673 (7.06 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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