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?Petrocrania halli

Tetradium

By Tetradium

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Acanthocrania setigera is described as only difference in having spinosa/pillose ornamentals on the outside which is a vague definition to me and is possible invalid name. So I'm just using Petrocrania halli for now. Occurs in mifflin section of Platteville Formation and Decorah Formation. Most common inarticulated brachiopod in Decorah formation.

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Brachiopods of Platteville/Decorah Twin Cities Minnesota

· 48 images
  • 48 images
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  • 8 image comments

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  • Taken with Apple iPad (7th generation)
  • Focal Length 3.3 mm
  • Exposure Time 1/120
  • f Aperture f/2.4
  • ISO Speed 32
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Tetradium

* Papillose - meaning as having little stalked structures similar to sea anemone tentacles. Either it had to be microscope which wasn't said by the author or something else. I did see some kind of structures on most of the individual specimens but it's more like lumpy squiggles than anything else. The specimen left of center is the solo one that I had found in Mifflin Section of Platteville Formation and is much smoother thus the lumpy squiggles could be harden limestone but that's just a guess. 

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