Seven Species of Crinoids on One Plate - Crawfordsville, Indiana

These are seven fossil crinoids from the Edwardsville Formation crinoid beds near Crawfordsville, Indiana. This association includes a Cyathocrinites multibrachiatus crinoid (#17), a Goniocrinus harrisi (#26), a Pachylocrinus aequalis crinoid (#35), a Sarocrinus varsoviensis (granilineus) crinoid (#41), an Ulrichicrinus coryphaeus crinoid (#50), an Actinocrinites gibsoni crinoid (#52) and a Macrocrinus mundulus crinoid (#69).

These fossils were prepared using skillful air-abrasion techniques under a stereo microscope. There is a repaired crack through the rock. Comes with an acrylic display stand.

#17 - Cyathocrinites multibrachiatus
#26 - Goniocrinus harrisi
#35 - Pachylocrinus aequalis
#41 - Sarocrinus varsoviensis (granilineus)
#50 - Ulrichicrinus coryphaeus
#52 - Actinocrinites gibsoni
#69 - Macrocrinus Mundulus

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.

Crawfordsville, Indiana
Edwardsville Formation
7 x 5.3" rock
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