Very 3D, 2.3" Agaricocrinus Crinoid - Indiana

This is a great specimen of the crinoid Agaricocrinus americanus from the famous Witherspoon Quarry near Crawfordsville, Indiana. The crown of this very three dimensional crinoid specimen is 2.3" and centered on a 3.8x2.9" piece of limestone. Agaricocrinus is one of the more desirable crinoids from this formation. It has been meticulously 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.

Crinoids, sometimes commonly referred to as sea lilies, are animals, not plants. They are echinoderms related to starfish, sea urchins, and brittle stars. Many crinoid traits are like other members of their phylum. Such traits include tube feet, radial symmetry, a water vascular system, and appendages in multiples of five (pentameral). They first appeared in the Ordovician (488 million years ago) and some species are still alive today.

Agaricocrinus americanus
Witherspoon Quarry, Crawfordsville, Indiana
Ramp Creek Limestone
Crown 2.3", Matrix 3.8x2.9"
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