File:Chert nodule (Green River Formation, Eocene; Temple Hill, east of Manti, Utah, USA) 5 (49057798832).jpg

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Chert nodule from the Eocene of Utah, USA. (nodule cross-section; ~3.3 centimeters across at it widest)

Chert is a cryptocrystalline, quartzose sedimentary rock. It can occur as bedded chert or as chert nodules. Low-impurity chert is called "flint" by rockhounds. This nodule has concentric color banding reminiscent of an eye. It comes from the Green River Formation in Utah. The unit is a widespread, Eocene-aged lake deposit. It is famous for having vast oil shale deposits and containing exquisitely-preserved fossils.

Stratigraphy: marly interval above a thin, white, oolitic limestone marker bed in the almost-uppermost Green River Formation, Eocene (lower Middle Eocene?)

Locality: Temple Hill, immediately adjacent to (east of) a Mormon church, due east of the town of Manti, foothills of the Wasatch Plateau, south-central Sanpete County, central Utah, USA

See info. at:

<a href="https://en.wikipedia.org/wiki/Green_River_Formation" rel="noreferrer nofollow">en.wikipedia.org/wiki/Green_River_Formation</a>
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Source Chert nodule (Green River Formation, Eocene; Temple Hill, east of Manti, Utah, USA) 5
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@N05/49057798832 (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.

6 December 2019

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current02:05, 6 December 2019Thumbnail for version as of 02:05, 6 December 20191,647 × 863 (952 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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