Cyathocrinites & Macrocrinus Crinoids - Indiana

 
 
Here are two different types of crinoid from the Ramp Creek Limestone in Crawfordsville, Indiana. The larger one is a Cyathocrinites iowensis, measuring 5.4" including the stem and the smaller one is a Macrocrinus mundulus. This plate is a composite meaning both crinoid fossils were found with little rock surrounding them and remounted onto the plate for display purposes. Comes with 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
Cyathocrinites iowensis & Macrocrinus mundulus
LOCATION
Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Matrix 6.8x4.9"
CATEGORY
SUB CATEGORY
ITEM
#42987
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