Two Crinoids (Sarocrinus & Agaricocrinus) - Crawfordsville, Indiana

 
This is an association of two species of crinoids (Sarocrinus varsovensis & Agaricocrinus splendens) from the famous crinoid beds near Crawfordsville, Indiana. The Sarocrinus is just under an inch long and Agaricocrinus is 1.2" wide. They have been prepared under microscope using air abrasives.

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
$99
DETAILS
SPECIES
Sarocrinus varsovensis & Agaricocrinus splendens
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Rock 2.9x1.7"
CATEGORY
SUB CATEGORY
ITEM
#68475
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