6.5" Crinoid Plate (Macrocrinus & Dorycrinus) - Crawfordsville

 
 
This is a beautiful crinoid association from the Edwardsville Formation near Crawfordsville, Indiana, with two individual specimens representing two species present. Both are preserved 3D and have been prepared with air abrasives. The rock is 6.5 x 3.7". The stem on the Macrocrinus is likely a composite.

This specimen includes an acrylic display stand.

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 & Dorycrinus gouldi
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Rock 6.5 x 3.7"
CATEGORY
SUB CATEGORY
ITEM
#94393
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