1.5" Agaricocrinus Crinoid - Crawfordsville, Indiana

This is a bargain Agaricocrinus americanus crinoid from the famous Witherspoon crinoid quarry near Crawfordsville, Indiana. It's oriented so that you are looking up at the base of the Calyx. It was prepared under microscope using air abrasives.

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.
DETAILS
SPECIES
Agaricocrinus americanus
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
1.5" long on 2.3x1.8" matrix
CATEGORY
SUB CATEGORY
ITEM
#48407
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