Eleven Species of Crinoids on One Plate - Crawfordsville, Indiana

This plate contains twenty two fossil crinoids (eleven species) and a gastropod (Platyceras equilateralis) from the Edwardsville Formation crinoid beds near Crawfordsville, Indiana. This association includes an Abrotocrinus unicus (#2), a Barycrinus rhombiferus crinoid (#6), a Catilocrinus tennesseeae crinoid (#9), two Lanecrinus depressus crinoids (#21), two Pachylocrinus aequalis crinoids (#35), two Agaricocrinus splendens crinoids (#55), a Dichocrinus ficus crinoid (#58), nine Macrocrinus mundulus crinoids (#69), a Platycrinites brevinodus crinoid (#72), an Onychocrinus ulrichi crinoid (#81) and a Cyathocrinites iowensis crinoid (#100).

These fossils were prepared using skillful air-abrasion techniques under a stereo microscope. The Platycrinites brevinodus has been remounted back to this rock following preparation and there is a repaired crack through the small Catilocrinus crinoid. Comes with an acrylic display stand.

#2 - Abrotocrinus unicus (.7" long)
#6 - Barycrinus rhombiferus (.5" long)
#9 - Catilocrinus tennesseeae (.7" long)
#21 - Lanecrinus depressus (.35" & .55" long)
#35 - Pachylocrinus aequalis (.7" & 1.45" long)
#55 - Agaricocrinus splendens (.8" & 1.35" wide)
#58 - Dichocrinus ficus (1" long including stem)
#69 - Macrocrinus mundulus (9 separate crinoids)
#72 - Platycrinites brevinodus (1.4" long)
#81 - Onychocrinus ulrichi (2.2" wide)
#92 - Platyceras equilateralis (.3" wide gastropod)
#100 - Cyathocrinites iowensis (1.4" long including stem)

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.

Several Species
Crawfordsville, Indiana
Edwardsville Formation
9.5 x 8.2" rock
We guarantee the authenticity of all of our
specimens. Read more about our
Authenticity Guarantee.