2.25" Crinoid (Platycrinites) With Gastropod - Crawfordsville, Indiana

 
 
 
 
This is a 2.25" long Platycrinites hemisphericus crinoid from "The Bluffs" near Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope. There is also a gastropod (Platycerus) underneath it and the stem of another crinoid on the rock.

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
Platycrinites hemisphericus
LOCATION
Bluff's Site, Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Platycrinites 2.25" long on Rock 4.1 x 2.9"
CATEGORY
SUB CATEGORY
ITEM
#130159
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