Grypania

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Grypania
Grypania spiralis.JPG
Grypania spiralis fossil
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Incertae sedis
Genus:† Grypania
Walter, Oehler & Oehler, 1976 [1]
Type species
Grypania spiralis
Walter, Oehler & Oehler, 1976

Grypania is an early, tube-shaped fossil from the Proterozoic eon. The organism, with a size over one centimeter and consistent form, could have been a giant bacterium, a bacterial colony, or a eukaryotic alga. [2] The oldest probable Grypania fossils date to about 2100 million years ago (redated from the previous 1870 million) [2] [3] and the youngest extended into the Ediacaran period. [4] This implies that the time range of this taxon extended for 1200 million years.

References

  1. ↑ M. R. Walter, John H. Oehler & Dorothy Z. Oehler (1976). "Megascopic algae 1,300 million years old from the Belt supergroup, Montana: a reinterpretation of Walcott's Helminthoidichnites". Journal of Paleontology . 50 (5): 872–881. JSTOR   1303584.
  2. 1 2 Han, T. M.; Runnegar, B. (1992-07-10). "Megascopic eukaryotic algae from the 2.1-billion-year-old negaunee iron-formation, Michigan". Science. 257 (5067): 232–235. Bibcode:1992Sci...257..232H. doi:10.1126/science.1631544. ISSN   0036-8075. PMID   1631544.
  3. ↑ Schneider, D. A., Bickford, M. E., Cannon, W. F., Schulz, K. J., & Hamilton, M. A. (2002). Age of volcanic rocks and syndepositional iron formations, Marquette Range Supergroup: implications for the tectonic setting of Paleoproterozoic iron formations of the Lake Superior region. Canadian Journal of Earth Sciences, 39(6), 999-1012.
  4. ↑ Wang, Y., Wang, Y., & Du, W. (2016). The long-ranging macroalga Grypania spiralis from the Ediacaran Doushantuo Formation, Guizhou, South China. Alcheringa: An Australasian Journal of Palaeontology, 1-10.


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