Spectacular, 10.2" Crinoid Plate (5 species) - Crawfordsville


This is a spectacular crinoid association from the Edwardsville Formation near Crawfordsville, Indiana, with five different species present. All are preserved 3D and have been prepared with air abrasives. The entire piece is 10.2 x 7.7". There are two Actinocrinites gibsoni crinoids, two Cyathocrinites harrodi, three Macrocrinus mundulus, two Scytalocrinus robustus and one Saccosomopsis insperatus. This is a natural association and none of the crinoids are composites.

Comes with a display stand.

Crinoids from the Ramp Creek Limestone were likely 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.

Actinocrinites gibsoni, Macrocrinus mundulus, Cyathocrinites harrodi, Scytalocrinus robustus, Saccosomopsis insperatus
Crawfordsville, Indiana
Edwardsville Formation
Rock 10.2 x 7.7"
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