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Name:
See Description
Age: Mississippian
Formation: Edwardsville Formation
Location: Crawfordsville, Indiana
Size: Plate is 6.6'' X 9.3''
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This is a wonderful plate of fossil echinoderms from the famous Mississippian layers near Crawfordsville, Indiana. In the upper left corner of the plate is a large calyx of Actinocrinites gibsoni with a highly uncommon Onychaster flexilis, a starfish, tightly attached. This specimen represents a true symbiotic relationship. The starfish fed on the excrement of the crinoid. In doing so, it cleaned up the environment so the crinoid could keep living. All five sinuous arms of the starfish are beautifully displayed, and the fine detail is clearly defined. A fine Macrocrinus mundulus is located below the starfish. This camerate crinoid has a very unusual split anal tube with a round stem tightly attached. In the center of the plate is a rare Cydrocrinus concinnus. This crinoid is complete to the very tips of the arms, and the long stem is easily seen. A huge, robust example of Actinocrinites gibsoni is in the upper right corner of the plate. This camerate crinoid has a large cup with very stellate plates and feathery, biserial arms. Another Macrocrinus is peeking out from under the right side of the Actinocrinites. Below this crinoid is a very nice example of Agaricocrinus splendens. Once again, this crinoid is complete to the very tips of the arms. All of the crinoids are very 3-dimensional and exhibit excellent detail. They have very good color and contrast and are well presented on the somewhat rectangular plate of siltstone. This is a great plate of crinoids from Indiana that also includes a rare starfish.
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