1.7" Crinoid (Gilbertsocrinus) Fossil - Crawfordsville, Indiana

 
This is a 1.7" wide Gilbertsocrinus tuberosus crinoid from the bluff's site near Crawfordsville, Indiana. There is a gastropod (Platyceras) alongside the crown of the crinoid and a crinoid stem that runs across the rock. The quality of preparation on this fossil is exquisite - 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.

FOR SALE
$75
DETAILS
SPECIES
Gilbertsocrinus tuberosus & Platyceras (Gastropod)
LOCATION
Bluff's Site, Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Crinoid 1.7" wide, Rock 4.6 x 3.9"
CATEGORY
SUB CATEGORY
ITEM
#125910
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