Two Detailed Crinoids (Agaricocrinus & Macrocrinus) - Indiana

This is a pair of very detailed crinoid fossils from the famous Witherspoon crinoid quarry near Crawfordsville, Indiana. There is a 1.95" long Macrocrinus mundulus associated with a 1.15" Agaricocrinus americanus. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope.

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 & Macrocrinus mundulus
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Macrocrinus 1.95", Agaricocrinus 1.15", Rock 3.3x2.4
CATEGORY
SUB CATEGORY
ITEM
#78298
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