Onychocrinus, Macrocrinus & Sarocrinus Crinoids - Indiana

 
 
 
 
This is a beautiful association of three different types of crinoids from Crawfordsville, Indiana.
There is a nice Macrocrinus mundulus with long stem attached and anal tube preserved. A large crown of an uncommon Onychocrinus ulrichi and a crown of a Sarocrinus varsovensis prepared from the top looking down . .The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope. Comes with a 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.
FOR SALE
$475
DETAILS
SPECIES
Onychocrinus ulrichi, Macrocrinus mundulus & Sarocrinus varsovensis
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Rock 6x5"
CATEGORY
SUB CATEGORY
ITEM
#66066
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