Three Species of Crinoids On One Plate - Crawfordsville, Indiana

This is a spectacular crinoid association from the Edwardsville Formation near Crawfordsville, Indiana, with three different species present. All are preserved 3D and have been prepared with air abrasives. There is a 10.4" long (including stem) Parisocrinus sp, a 8.2" long Decadocrinus tumidulus (including stem) and a 2.4" Macrocrinus mundulus (including stem). Comes with an acrylic display stand.

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, Parisocrinus sp. & Decadocrinus tumidulus.
Crawfordsville, Indiana
Edwardsville Formation
Rock 12.4x10.8"
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