Three Species of Crinoids on One Plate - Crawfordsville, Indiana

These are four fossil crinoids from the Edwardsville Formation crinoid beds near Crawfordsville, Indiana. This association includes two Scytalocrinus decadactylus crinoids (#47), a Dizygocrinus mutabilis crinoid (#63) and a Cyathocrinites iowensis crinoid (#100).

These fossils were prepared using skillful air-abrasion techniques under a stereo microscope. There appear to be two small unidentified crinoids under the largest Scytalocrinus crinoid. Comes with an acrylic display stand.

#47 - Scytalocrinus decadactylus (.7" & 2.3" long)
#63 - Dizygocrinus mutabilis (.6" long including stem)
#100 - Cyathocrinites iowensis (1.3" wide)

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.

Scytalocrinus decadactylus, Dizygocrinus mutabilis & Cyathocrinites iowensis
Crawfordsville, Indiana
Edwardsville Formation
5.1 x 2.6" rock
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