2.8" 3D Macrocrinus Crinoid Fossil - Indiana

This is a 3D Macrocrinus mundulus crinoid from Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope. This specimen has the anal tube exposed at the top of the crown. The specimen has been remounted on the limestone.

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.
FOR SALE
$125
DETAILS
SPECIES
Macrocrinus mundulus
LOCATION
Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
2.8" long on 4x3.3" rock
CATEGORY
SUB CATEGORY
ITEM
#52928
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