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Partially pyritized spiriferid

Misha

By Misha

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Mucrospirifer prolificus

Givetian
Silica Shale Fm.
Milan, MI

Gift from @connorp

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From the album:

Misha's Middle Devonian Fossils

· 92 images
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  • Taken with Google Pixel 4a
  • Focal Length 4.4 mm
  • Exposure Time 980/1000000
  • f Aperture f/1.7
  • ISO Speed 79
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Misha
1 hour ago, Tidgy's Dad said:

M. prolificus is now synonymized with M. mucronatus.

Really? interesting.

They seem to have quite different morphologies, this specimen has a much wider interarea that separates the two valves while in others that is just a thin line separating the shells along the hinge. Do you know why that is?

I hope I described that correctly, I don't have a photo of the back of the specimen available to me at this moment 

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Tidgy's Dad

It may be a different genus entirely. 

When you have time, PM me pictures of the hinge line and the other valve.  

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