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 Macrocrinus mundulus crinoids (#69), an Abrotocrinus coreyi crinoid (#1) and a Scytalocrinus disparilis crinoid (#42).

These fossils were prepared using skillful air-abrasion techniques under a stereo microscope. Comes with an acrylic display stand.

#1 - Abrotocrinus coreyi (1.4" long)
#42 - Scytalocrinus disparilis (1.9" long including stem)
#69 - Macrocrinus mundulus (2 total)

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, Abrotocrinus coreyi & Scytalocrinus disparilis
Crawfordsville, Indiana
Edwardsville Formation
6.1 x 4.4" rock
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