Two Crinoid (Platycrinites) Fossils - Crawfordsville, Indiana

These are two really nice Platycrinites hemisphericus crinoids from the bluff's site near Crawfordsville, Indiana. There is a partially exposed gastropod attached to the crown of one of the crinoids and a fossil coral specimen along one edge of the specimen. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope.

Comes with a gibson display stand. The longest stem on this specimen is a composite and wasn't naturally associated with the crown when found.

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.

Platycrinites hemisphericus
Bluff's Site, Crawfordsville, Indiana
Edwardsville Formation
Platycrinites 5.5" & 2.9" long (including stem), Rock 7.9 x 7.1"
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