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by Stratigraphy.net
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Pentagon Shaped Crinoid Fossils

 


This picture is of a set of crinoid pentagon shaped fossils that once made up a column. They existed in the Mississippian Period. The fossils were found in Carwood Formation (part of the Borden Group) of Washington County, Indiana USA. 

There are also a few impressions of brachiopods and near the bottom left corner a spiral shape that I am not sure what kind of creature it belonged to.

Thanks to Kenny for the picture.

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