collenia
{{Short description|Extinct genus of cyanobacteria}}
{{Automatic taxobox
| fossil_range = Siderian–Rhyacian {{Long fossil range|2400|2100}}
| 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[https://repository.si.edu/bitstream/handle/10088/23529/SMC_64_Walcott_1914_2_77-156.pdf Smithsonian miscellaneous collections Walcott 1914] si.edu
| type_species = {{extinct}}Collenia undosa
| subdivision_ranks = Species
| subdivision = *{{extinct}}C. frequens
- {{extinct}}C. symmetrica
- {{extinct}}C. undosa
}}
Collenia is genus of fossil cyanobacteria that form a particular type of stromatolites.{{cite book |author=Rich, Thomas H. V. |author2=Fenton, Carroll Lane |author2-link=Carroll Lane Fenton |author3=Fenton, Mildred Adams |author3-link=Mildred Adams Fenton |author4=Rich, Pat Vickers |title=The fossil book: a record of prehistoric life |publisher=Dover Publications |location=New York |year=1996 |isbn=0-486-29371-8 |url-access=registration |url=https://archive.org/details/fossilbookrecor00rich }}
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.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]
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.
See also
References
{{Reflist}}
External links
- [https://books.google.com/books?id=uhOoAB52-gIC&dq=Collenia+fossil&pg=PA54 Geological Survey Professional Paper, Volume 669]
- Spencer G. Lucas,Justin A. Spielmann,Patricia M. Hester,Jason P. Kenworthy,Vincent L. Santucci [https://books.google.com/books?id=q1bmCQAAQBAJ&dq=Collenia+fossil&pg=PA59 Americas Antiquities: 100 Years of Managing Fossils on Federal Lands]
- [http://www.fossilmuseum.net/Fossil_Galleries/StromatolitesAmerica.htm Stromatolites - Precambrian: Archaean and Proterozoic Stromatolite]
- [https://books.google.com/books?id=s6oPAAAAIAAJ&dq=Collenia+fossil&pg=PA133 Index of Generic Names of Fossil Plants, 1820-1950]
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