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This was discovered yesterday on an excursion into Iowa's Ordovician Decorah Shale. Initially I thought a star shaped crinoid columnal but on close examination, no lumen can be seen. The specimen is about 5 mm in diameter. @crinus

 

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Crinoid calyx plate?  :headscratch:

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    Tim    -  VETERAN SHALE SPLITTER

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1 minute ago, Fossildude19 said:

Crinoid calyx plate?  :headscratch:

That would be my guess as well, something along the lines of Carabocrinus.

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There's no limit to what you can accomplish when you're supposed to be doing something else

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Yes, I agree with a calyx plate from a stalked echinoderm. 

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