1.45" Crinoid (Scytalocrinus) With Bryozoan Fossil - Crawfordsville

This is a detailed Scytalocrinus disparilis crinoid that preserved in association with a bryozoan. This specimen was collected from the famous crinoid beds near Crawfordsville, Indiana. 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.


Bryozoans are microscopic aquatic invertebrates that live in colonies, forming skeletal structures. The form of these skeletal structures is unique to each particular species. The individual Byrozoans which form the colonies are called zooids and are filter feeders, straining nutrients from the surrounding water.
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DETAILS
SPECIES
Scytalocrinus disparilis & Unidentified Bryozoan
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
1.45" long (stem included) on 1.85 x 1.5" rock
CATEGORY
SUB CATEGORY
ITEM
#122972
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