Collenia is genus of fossil cyanobacteria that form a particular type of .
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.
[Carroll Lane Fenton,Pat Vickers Rich,Mildred Adams Fenton,Thomas H. V. Rich The Fossil Book: A Record of Prehistoric Life]
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.
See also
-
List of fossil stromatolites
External links
