4.1" Fossil Crinoid and Starfish Association - Crawfordsville, Indiana

This is a detailed and unusual, 2.4" long (including stem) Forbesiocrinus multibrachiatus crinoid that preserved in association with a 1" wide starfish (Onychaster flexilis) from the famous crinoid beds near Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope.

This is a natural association with the only repair work to the crinoid is a repaired crack where a section broke away during collection. Comes with an acrylic display stand.

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.

Forbesiocrinus multibrachiatus (crinoid) & Onychaster flexilis (starfish)
Crawfordsville, Indiana
Edwardsville Formation
2.4" long crinoid (including stem) on 4.1 x 3.6" rock
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