Enrolled Griffithites Trilobite & Gastropod - Crawfordsville, Indiana

 
 
This is a enrolled Griffithites buffo trilobite associated with a Platycerus equalateralis gastropod from the crinoid beds near Crawfordsville, Indiana. Trilobites are a rare find at this location. The trilobite is enrolled with only the back side exposed and is .85" wide.

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
Griffithites buffo & Platycerus equalateralis
LOCATION
Bluff's Site, Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Trilobite .85" wide, gastropod 1", Rock 3.5x2.2"
SUB CATEGORY
ITEM
#130174
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