.5" Onychocrinus Crinoid Crown - Crawfordsville, Indiana

This is a small Onychocrinus ulrichi crinoid crown from the famous Witherspoon crinoid quarry near Crawfordsville, Indiana. The 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.

SOLD
DETAILS
SPECIES
Onychocrinus ulrichi
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
.5" on 1.3x1.1" limestone
CATEGORY
SUB CATEGORY
ITEM
#48454
GUARANTEE
We guarantee the authenticity of all of our
specimens. Read more about our
Authenticity Guarantee.