File:Lacustrine stromatolites (Green River Formation, Eocene, 45.5-48 Ma; Delaney Rim, Wyoming, USA) 2 (43369468611).jpg

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Lacustrine stromatolites from the Eocene of Wyoming, USA.

The wavy-layered structures seen here are stromatolites. It was built up by mats of cyanobacteria. Stromatolites vary in appearance, ranging from slightly wrinkled horizontal laminations in sedimentary rocks to low mounds to prominent mounds to columnar structures and other forms. Stromatolites are most common in the Proterozoic fossil record. They are scarce today, but famous modern examples occur at Shark Bay, Western Australia.

Stratigraphy: Green River Formation, Eocene

Locality: unrecorded/undisclosed site in the Delaney Rim area, southern Wyoming, USA

See info. at:

<a href="https://en.wikipedia.org/wiki/Stromatolite" rel="noreferrer nofollow">en.wikipedia.org/wiki/Stromatolite</a>
Date
Source Lacustrine stromatolites (Green River Formation, Eocene, 45.5-48 Ma; Delaney Rim, Wyoming, USA) 2
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@N05/43369468611 (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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current02:04, 6 December 2019Thumbnail for version as of 02:04, 6 December 20193,231 × 2,444 (4.18 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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