Friday, May 6, 2011

Brown Puff Ball Fossil

Not sure what this is, thought it might be some sort of crinoid calyx but cannot find where the stem attached.  Reminds me of a brownish dinner roll or slightly deflated doughnut hole.  It is about 2 cm wide and 1 cm tall embedded in matrix with a lot of Cryptolithus trilobite pieces.  The brown material might be argonite.  Matrix is the Kope Formation of the Ordovician period found in Carroll County, Kentucky.

Also included is a picture of a fragment of an Ambonychia clam fossil located on the same matrix block as this mystery fossil.

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