Crawfordsville Crinoid Fossil
Mississippian, Osagean Stage (~ 345 million years ago)
crown is 35 mm long by 35 mm wide
This is a well-preserved example of the Crawfordsville
known as Agaricocrinus americanus of Family Coelocrinidae.
The Agaricocrinus is exceptionally well preserved in remarkeble
three-dimensional relief, Also note the
fine pinnulation that it needed to filter food from the water
column. Crinoids disintegrate shortly after death, making fossilization
of fine details as seen here a rare event.
fossil pictures to enlarge