Agaricocrinus & Macrocrinus Crinoids - Indiana

 
 
This is a nice association of two different types of crinoids from the famous fossil beds at Crawfordsville, Indiana. There is nicely preserved Agaricocrinus americanus (larger crinoid) along with a small Macrocrinus mundulus. Both specimens are very nicely detailed and have been prepared under microscope using air abrasives.

Please note that the Macrocrinus was probably composited onto the plate.

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
Agaricocrinus americanus & Macrocrinus mundulus
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Matrix 2.85x2.5
CATEGORY
SUB CATEGORY
ITEM
#35674
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