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Hydrophobic

Treasure From Empire Mine, Mi (Grypania Spiralis)

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Hydrophobic

Hello all,

An Iron ore mine has led to one of the greatest fossil discoveries to date, and has indicated that all the history books should be rewritten! Algae 2.1 billion years old incased in an iron formation indicates that complex life existed much earlier than 1.4 billion as previously thought.

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post-15474-0-83088000-1401726200_thumb.png

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Auspex

That's a nice specimen!

The current consensus seems to be that it was an eukaryotic alga, I believe?

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painshill

That's a nice specimen!

The current consensus seems to be that it was an eukaryotic alga, I believe?

Yes... probably.

The discovery was made in 1992 though... not recently. More info here:

http://www.newark.osu.edu/facultystaff/personal/jstjohn/Documents/Cool-fossils/Grypania-spiralis.htm

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Auspex

Is it possible to acquire a specimen? Seems like no mini-museum would be complete without it.

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piranha

Yes, the Michigan specimens were first described in 1992, but the first description of Grypania was from Montana by Walcott in 1899. He interpreted the specimens as metazoan trace fossils and subsequently named it Helminthoidichnites? spiralis. Eventually in 1976 Walter et al. reinterpreted the Montana material as Grypania spiralis (Walcott), n. gen., n. comb. Attached is my prized example from the Negaunee Iron-Formation that has remarkable 3D relief of the filaments.

 

Grypania spiralis.jpg

 

Walcott, C. D. 1899.

Pre-Cambrian fossiliferous formations.

Geological Society of America, Bulletin, 10:199-244

 

Walter, M.R., Oehler, J.H., & Oehler, D.Z. (1976)

Megascopic algae 1300 million years old from the Belt Supergroup, Montana: a reinterpretation of Walcott's Helminthoidichnites.

Journal of Paleontology, 50(5):872-881

 

Han, T.M., & Runnegar, B. (1992)

Megascopic eukaryotic algae from the 2.1-billion-year-old Negaunee Iron-Formation, Michigan.

Science, 257:232-235

 

 

 

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Auspex

...Attached is my prized example from the Negaunee Iron-Formation that has remarkable 3D relief of the filaments.

attachicon.gifGrypania spiralis.jpg

:o! :wub:

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