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Large, 3D Actinocrinites Crinoid - Crawfordsville, Indiana
This is a spectacular, 3D Actinocrinites collected from the famous crinoid deposits in Crawfordsville, Indiana. Actinocrinites is one of the more sought after crinids from the locality due to it's large size and impressive preservation. The specimen is 4.6" long on a 5.3x3" slab of limestone. There is also a Onychocrinus ulrichi present next to the stem. This piece was prepared using air abrasives under 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.
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.
SPECIES
Actinocrinites gibsoni & Onychocrinus ulrichi
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
4.6" long on 5.3x3" limestone
CATEGORY
SUB CATEGORY
ITEM
#48394
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