Fossil layers

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Earth's Atmosphere, Rocks And Fossils, Earth Atmosphere, Metamorphic Rocks, Sedimentary Rocks, Green River, Oil Gas, Photosynthesis, Oil And Gas

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.

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