Collenia

Collenia is genus of fossil cyanobacteria that form a particular type of stromatolites.[1]

Collenia
Temporal range: 2100–2400 Ma
↓
Precambrian
Section of Collenia undosa stromatolite from 2110 million year old banded iron formation, Biwabik
Collenia undosa stromatolite from Precambrian of United States
Scientific classification
Kingdom:
Bacteria
Phylum:
Cyanophyta
Family:
Spongiostromata
Subfamily:
Stromatolithi
Genus:
Collenia

Walcott, 1914
species
  • C. frequens
  • C. symmetrica
  • C. undosa

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.[2]

Fossil record

Collenia stromatolites were very common in the late Precambrian, about 2.2 to 2.4 billion years ago.

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References
  1. Rich, Thomas H. V.; Fenton, Carroll Lane; Fenton, Mildred Adams; Rich, Pat Vickers (1996). The fossil book: a record of prehistoric life. New York: Dover Publications. ISBN 0-486-29371-8.
  2. Carroll Lane Fenton,Pat Vickers Rich,Mildred Adams Fenton,Thomas H. V. Rich The Fossil Book: A Record of Prehistoric Life
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