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Temporal range: 2100–2400 Ma
Collenia undosa Minnesota.jpg
Section of Collenia undosa stromatolite from 2110 million year old banded iron formation, Biwabik
Stromatolithi - Collenia nudosa.JPG
Collenia undosa stromatolite from Precambrian of United States
Scientific classification
Kingdom: Bacteria
Phylum: Cyanophyta
Family: Spongiostromata
Subfamily: Stromatolithi
Genus: Collenia
Walcott, 1914
  • C. frequens
  • C. symmetrica
  • C. undosa

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


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[edit]

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


  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

External links[edit]