Three Crinoids (Agaricocrinus, Gilbertsocrinus & Taxocrinus) - Indiana

 
 
These are three fossil crinoids from the Edwardsville Formation crinoid beds near Crawfordsville, Indiana. This association includes a 2.15" long Agaricocrinus americanus crinoid (largest), a 1.9" wide Gilbertsocrinus dispansus crown (lumpy appearance) and a partially exposed .65" wide crinoid of the species Taxocrinus colletti. The Taxocrinus colletti crinoid can be found further exposed along that back side of the specimen. There are also multiple crinoid stem segments that can be found scattered throughout the rock, including one massive one that sits between the three crinoids.

These fossils were prepared using skillful air-abrasion techniques under a stereo microscope. 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.



DETAILS
SPECIES
Agaricocrinus americanus, Gilbertsocrinus dispansus & Taxocrinus colletti
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
5.1 x 4.9" rock
CATEGORY
SUB CATEGORY
ITEM
#122992
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