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Grypania spiralis from the Negaunee Iron-Formation (Paleoproterozoic, 2.11 Ga or 1.874 Ga) at the Empire Mine southeast of Ishpeming in Marquette County, Upper Peninsula of Michigan, USA.  (public display, Cliffs Shaft Iron Mine & Museum, ...

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Grypania spiralis from the Negaunee Iron-Formation (Paleoproterozoic, 2.11 Ga or 1.874 Ga) at the Empire Mine southeast of Ishpeming in Marquette County, Upper Peninsula of Michigan, USA.  (public display, Cliffs Shaft Iron Mine & Museum, ...

Attribution License

500 x 260
Flickr

Grypania spiralis from the Negaunee Iron-Formation (Paleoproterozoic, 2.11 Ga or 1.874 Ga) at the Empire Mine southeast of Ishpeming in Marquette County, Upper Peninsula of Michigan, USA.  (public display, Cliffs Shaft Iron Mine & Museum, ...

Attribution License

500 x 418
Flickr

 
 

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