JimB88 Posted May 21, 2010 Share Posted May 21, 2010 This is from the Pennington Formation, which is Upper Mississippian in age. Its only one plate from it (everything from there is dis-articulated.) It seems the hydrospires are different from a pentrimites. Link to comment Share on other sites More sharing options...
Archimedes Posted May 22, 2010 Share Posted May 22, 2010 Its a piece of a blastoid from the Pentremites sulcatus group, these blastoids can get very large. Common sense is indeed not common, Link to comment Share on other sites More sharing options...
JimB88 Posted May 22, 2010 Author Share Posted May 22, 2010 Thanks, you sure know your Mississippian fossils! Link to comment Share on other sites More sharing options...
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