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Collenia
Extinct genus of cyanobacteria From Wikipedia, the free encyclopedia
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Collenia is genus of fossil cyanobacteria that form a particular type of stromatolites.[2]
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Description
Collenia are stromatolites made up of convex layers flattened in the center, forming columnar colonies. The microorganisms involved were likely photosynthetic bacteria expiring oxygen.[3]
Fossil record
Collenia stromatolites were very common in the Paleoproterozoic era during the Siderian and Rhyacian periods, about 2.2 to 2.4 billion years ago.
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