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Name:
Macrocrinus mundulus, Agaricocrinus americanus
Age: Mississippian
Formation: Edwardsville Formation
Location: Crawfordsville, Indiana
Size: Agaricocrinus is over 3 inches long
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This is a nice pair of crinoids from the Mississippian of Indiana. On the left side of the slab is a Macrocrinus mundulus. This type of Camerate crinoid has an urn-shaped cup composed of many plates, biserial arms, and an extremely long, multi-plated anal tube. The pinnulation of the arms is well displayed on this crinoid. The crinoid on the right is a very inflated example of Agaricocrinus americanus. This type of crinoid has heavy, biserial, and beautifully pinnulated arms. The plate structure of this echinoderm is very impressive and the arms are beautifully showcased. This crinoid still has the articulated stem tightly attached. The fossils have great color and contrast and are nicely positioned on the plate of siltstone. And best of all, they are totally natural to the plate - they have not been composited. This is a very attractive double crinoid specimen from the Edwardsville Formation.
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