File:Stromatolite with embedded snails (Fort Laclede Bed, Laney Member, Green River Formation, Lower Eocene; ancient Lake Gosiute, southwestern Wyoming, USA) (15195949255).jpg
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[edit]DescriptionStromatolite with embedded snails (Fort Laclede Bed, Laney Member, Green River Formation, Lower Eocene; ancient Lake Gosiute, southwestern Wyoming, USA) (15195949255).jpg |
Stromatolite (cut slice; field of view ~12 mm across) from the Fort Laclede Bed, Laney Member, Green River Formation (Eocene) of southwestern Wyoming, USA. Two lacustrine snails got caught up in pockets of a stromatolite. The snail shell on the left has oolitic & peloidal sediments filling the lower portions of its whorls & calcite spar cement filling the upper portions of the whorls - a geopetal structure. Stromatolites are layered structures built up by mats of cyanobacteria (= blue-green bacteria, often incorrectly called “blue-green algae”). Stromatolites are fairly common in portions of the shallow-water marine & nonmarine fossil record, but they also occur in a few modern localities (e.g., Shark Bay, coastal Western Australia). This one grew during the Eocene in ancient Lake Gosiute in southwestern Wyoming, USA. It comes from the Fort Laclede Bed of the Laney Member, Green River Formation. |
Date | |
Source | Stromatolite with embedded snails (Fort Laclede Bed, Laney Member, Green River Formation, Lower Eocene; ancient Lake Gosiute, southwestern Wyoming, USA) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15195949255. It was reviewed on 3 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 March 2015
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current | 18:22, 3 March 2015 | 1,676 × 914 (119 KB) | Jacopo Werther (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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