Huge 3.2" Onychocrinus Crinoid Crown - Indiana

 
This is a very large Onychocrinus ulrichi crinoid crown from the famous Witherspoon crinoid quarry near Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope. A really alien looking fossil.

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.
DETAILS
SPECIES
Onychocrinus ulrichi
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
3.2" wide on 3.7x3.1" matrix
CATEGORY
SUB CATEGORY
ITEM
#35673
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