14.2" Fossil Crinoid Plate (Four Species) - Crawfordsville, Indiana

This is a beautiful, 14.2" plate of detailed fossil crinoids from Crawfordsville, Indiana. There are four, large, identifiable crinoids representing four separate species. They have been microscopically prepared using air abrasives. The two larger crinoids are Agaricocrinus sp. and a partial Barycrinus rhombiferus. The more slender and less exposed crinoids are Macrocrinus mundulus and Parisocrinus sp.. This plate is quite phenomenal, with a variety of other crinoid bits scattered throughout the rock.

The plate is backed with a foam pad and an acrylic display stand is included for your convenience.

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.

Macrocrinus mundulus, Barycrinus rhombiferus, Parisocrinus sp., Agaricocrinus sp.
Crawfordsville, Indiana
Edwardsville Formation
14.2 x 7.1" rock
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