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.
From the album:
Brachiopods of Platteville/Decorah Twin Cities Minnesota
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