Beautiful Fossil 5" Crinoid Plate - Crawfordsville, Indiana

This is a beautiful crinoid association from the famous Witherspoon crinoid quarry near Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope.

There are two crowns of the much sought after Agaricocrinus americanus as well as a crown of a Scytalocrinus decadactylus next to each other on a 5x2.7" piece of limestone.

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.

Agaricocrinus americanus & Scytalocrinus decadactylus
Witherspoon Quarry, Crawfordsville, Indiana
Ramp Creek Limestone
Rock 5x2.7"
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