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4.5" Macrocrinus Crinoid With Rare Split Anal Tube Pathology
This is a very unusual crinoid fossil from the Ramp Creek Limestone in Crawfordsville, Indiana. It is a Macrocrinus mundulus with a long stem and a pathalogical anal tube which splits in two halfway up in length. Really a unique specimen which is beautifully prepared under 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
LOCATION
Witherspoon Quarry, Crawfordsville, Indiana
FORMATION
Ramp Creek Limestone
SIZE
4.5" long on 5.1x2.4" matrix
CATEGORY
SUB CATEGORY
ITEM
#48403
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