Pair Of Detailed Macrocrinus Crinoid Fossils - Indiana

 
 
 
This is a pair of very detailed Macrocrinus mundulus crinoids from Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope. Both specimens have nice sections of stem still attached and preserved anal tubes. A very aesthetic crinoid specimen.

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.

DETAILS
SPECIES
Macrocrinus mundulus
LOCATION
Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Larger 5.5" long, on 8.1x4.5" rock
CATEGORY
SUB CATEGORY
ITEM
#52931
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