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.

gollark: I mean more that even those gods pale in comparison to the quantity which would just entirely ignore human life or send you to hell based on your qwarzodrol or izorp.
gollark: Yes. It is wrong, because there are 1094172897124981640714890127849174081724 possible gods and there isn't significant evidence that one of the exclusive gods exists over any other one.
gollark: I am an atheist inasmuch as while I don't *know*, in the absence of evidence it would be silly to go "well, I can't technically rule it out, so it's maybe true" instead of "probably not".
gollark: ↑ Observe, a very outdated GTech™ apiary.
gollark: https://media.wired.com/photos/6126c73a67168b68f9ecec64/master/w_1600,c_limit/Business-ASML-The-EUV-system-without-its-covers-(ASML).jpg

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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