6.1" Fossil Crinoid (Platycrinites & Pachylocrinus) Plate - Indiana

 
 
These are two really nice crinoids from the bluff's site near Crawfordsville, Indiana. The largest crinoid (Platycrinites hemisphericus) is 2.7" long (including stem) and the smallest crinoid (Onychocrinus ulrichi) is 1.05" long (including stem). This rock also contains a coral fossil and some small bryozoan fossils. 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.

DETAILS
SPECIES
Platycrinites hemisphericus & Pachylocrinus aequalis
LOCATION
Bluff's Site, Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Crinoids 2.7" & 1.05" long (including stem), Rock 6.1 x 5.3"
CATEGORY
SUB CATEGORY
ITEM
#125920
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