1.3" Macrocrinus Crinoid Crown - Indiana

This is a 1.6" crown of Macrocrinus mundulus, collected near Crawfordsville, Indiana. It's been cleaned under microscope using air abrasives.

It is believed that crinoids from the Ramp Creek Limestone were buried in sediment from nearby deltas during storms. The resulting siltstone deposits are soft enough that fossils can be extracted in exquisite, three-dimensional relief.