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Name:
Crinoid / Starfish Plate
Age: Mississippian
Formation: Edwardsville
Location: Crawfordsville, Indiana
Size: Plate is 3.5" X 4.3"
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This is an outstanding echinoderm specimen from the Mississippian of Indiana. There are four nice crinoids and one gorgeous starfish on the plate. The fossils have excellent color and contrast. They are well displayed on the somewhat rectangular plate of siltstone. The crinoid on the left side of the matrix block is Scytalocrinus hamiltonensis. This crinoid has long, thick uniserial arms that display the fine pinnules. To the immediate right of the Scytalocrinus are the long arms of Decadocrinus tumidulus. This particular crinoid has very stout pinnules. A fine specimen of Macrocrinus mundulus is just below the Decadocrinus. The Macrocrinus exhibits feathery, biserial arms and a long anal tube. The crinoid on the right side of the slab is Onychocrinus ulrichi. This flexible crinoid has excellent plate structure and a portion of the stem is retained. The fossil in the upper right corner is Onychaster flexilis. This large brittlestar is very inflated and has absolutely wonderful detail. The plate structure is superb and the long, winding arms even display the tube feet of the animal. This is one of the most magnificent brittlestars we have ever seen - but the most interesting aspect of this fossil is that this brittlestar shows regeneration of one of the arms! Notice how one of the arms is very fat and then gets much thinner very abruptly. Examples of regeneration are extremely unusual in the fossil record. This is a very exciting specimen of echinoderms from the famous Crawfordsville, Indiana area.
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