Three Species of 3D Crinoids On One Plate - Crawfordsville, Indiana

This is a really cool 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 7.4" long (including stem) Pachylocrinus aequalis across the center of the plate, a 3.3" long (including stem) Barycrinus rhombiferus and a 1.8" wide Lanecrinus depressus. 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.

Pachylocrinus aequalis, Barycrinus rhombiferus & Lanecrinus depressus
Crawfordsville, Indiana
Edwardsville Formation
Rock 8x7.1"
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