File:Stromatolitic Limestone (Chencha Formation, Upper Neoproterozoic, 580 Ma; Patom Upland, Siberia, Russia) 2 (17370036792).jpg
Stromatolitic limestone from the Precambrian of Russia. (Cranbrook Institute of Science collection, Bloomfield Hills, Michigan, USA)
Date
Source
Stromatolitic limestone (Chencha Formation, upper Neoproterozoic, 580 Ma; Patom Upland, Siberia, Russia) 2
Author
James St. John
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.
Stratigraphy: Chencha Formation, upper Zhuya Group, Vendian (Ediacaran), upper Neoproterozoic, ~580 Ma
Locality: apparently derived from the Patom Upland, Siberia, RussiaLicensing
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