Collenia

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Extinct genus of cyanobacteria

title: "Collenia" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["proterozoic-life", "cyanobacteria-genera", "prehistoric-bacteria"] description: "Extinct genus of cyanobacteria" topic_path: "general/proterozoic-life" source: "https://en.wikipedia.org/wiki/Collenia" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Extinct genus of cyanobacteria ::

| fossil_range = Siderian–Rhyacian | image = Collenia undosa Minnesota.jpg | image_caption = Section of Collenia undosa stromatolite from 2110 million year old banded iron formation, Biwabik | image2 = Stromatolithi - Collenia nudosa.JPG | image2_caption = Collenia undosa stromatolite from Precambrian of United States | taxon = Collenia | authority = Walcott 1914 | type_species = Collenia undosa | subdivision_ranks = Species | subdivision = *C. frequens

C. symmetrica
C. undosa

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

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.

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.

References

[https://repository.si.edu/bitstream/handle/10088/23529/SMC_64_Walcott_1914_2_77-156.pdf Smithsonian miscellaneous collections Walcott 1914] si.edu
Rich, Thomas H. V.. (1996). "The fossil book: a record of prehistoric life". Dover Publications.
Carroll Lane Fenton,Pat Vickers Rich,Mildred Adams Fenton,Thomas H. V. Rich [https://books.google.com/books?id=_ntSspji0LYC&dq=Collenia+fossil&pg=PA87 The Fossil Book: A Record of Prehistoric Life]

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