This picture is a recent fossil find from the Glen Dean Member of Grayson County, Kentucky USA. It is a crinoid calyx fossil that appears to be a Pterotocrinus acutus (Wetherby, 1879). The fossil dates to the Mississippian Period.
The most interesting part of the fossil is when it photographed from the top revealing a gastropod was attached to its anal tube when they both died. A somewhat common relationship found in the fossil record between these two creatures.
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