2.8" Crinoid (Actinocrinites) Crown With Starfish - Crawfordsville

This is a 2.8" long, detailed crown of an Actinocrinites gibsoni crinoid that has a rare Onychaster flexilis starfish intertwined with it.

Crinoids from the Ramp Creek Limestone were likely 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.

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DETAILS
SPECIES
Actinocrinites gibsoni & Onychaster flexilis
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Crown 2.8" long, rock 4.2x3.1"
CATEGORY
SUB CATEGORY
ITEM
#132445
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