EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
Cross-section of a fossil Stromatolite. Stromatolite (Chlorellopsis colonia Reis) from the Fort Laclede Bed, Laney Member, Bridger A-B of the Green River (Formation). Stromatolites are formed by the trapping, binding, and cementation of sedimentary grains by microorganisms, especially cyanobacteria or blue-green algae.
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