Macrocrinus Crinoid With Preserved Anal Tube - Indiana

 
This is a gorgeous Macrocrinus mundulus crinoid 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. The anal tube of the crinoid is still preserved, protruding from the crown.

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
Macrocrinus mundulus
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
2.3" long on 3.5x2.3" matrix
CATEGORY
SUB CATEGORY
ITEM
#27556
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