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|
Collenia are stromatolites made up of convex layers flattened in the center, forming columnar colonies. The microorganisms involved were likely photosynthetic bacteria expiring oxygen. 
Collenia stromatolites were very common in the late Precambrian, about 2.2 to 2.4 billion yearsago.
- 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.
- Carroll Lane Fenton,Pat Vickers Rich,Mildred Adams Fenton,Thomas H. V. Rich The Fossil Book: A Record of Prehistoric Life
- Geological Survey Professional Paper, Volume 669
- Spencer G. Lucas,Justin A. Spielmann,Patricia M. Hester,Jason P. Kenworthy,Vincent L. Santucci Americas Antiquities: 100 Years of Managing Fossils on Federal Lands
- Stromatolites - Precambrian: Archaean and Proterozoic Stromatolite
- Index of Generic Names of Fossil Plants, 1820-1950
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