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Macrocrinus, Gilbertsocrinus & Hylodecrinus Crinoids - Indiana
This is an unusual association of three different types of crinoids (Macrocrinus mundulus, Gilbertsocrinus dispansus & Hylodecrinus briareus) collected near Crawfordsville, Indiana. The quality of preparation on this fossil is exquisite - using skillful air-abrasion techniques under a stereo microscope.
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.
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.
SPECIES
Macrocrinus mundulus, Gilbertsocrinus dispansus & Hylodecrinus briareus
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
Rock 3x2.8"
CATEGORY
SUB CATEGORY
ITEM
#66057
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