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File:Stromatolites, Belt Supergroup, Glacier National Park.jpg

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Stromatolites (cut & polished slice) from the Precambrian of Montana (public display, Museum of the Rockies, Bozeman, Montana, USA).

Stratigraphy: Snowslip Formation, Belt Supergroup, Mesoproterozoic, ~1.44 Ga.

Locality: Glacier National Park, northwestern Montana, USA.

Stromatolites are large, layered structures 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.
Date
Source Stromatolites (Snowslip Formation, Belt Supergroup, Mesoproterozoic, 1.44 Ga; Glacier National Park, Montana, USA) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15015808670. It was reviewed on 11 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

11 September 2014

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current00:26, 11 September 2014Thumbnail for version as of 00:26, 11 September 20143,008 × 2,000 (3.96 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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