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Name:
See Description
Age: Mississippian
Formation: Edwardsville
Location: Crawfordsville, Indiana
Size: Plate is approximately 3.8" X 4.5".
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This plate contains four different genera of crinoids. It was found in the Mississippian deposits near Crawfordsville, Indiana. These ancient echinoderms are 3-dimensional and exhibit fine detail. The fossil at the top of the plate is Macrocrinus mundulus. This crinoid has a long stem, great plate structure of the cup, and long, biserial arms. The top of the anal tube is exposed between and above the arms. Directly below the Macrocrinus is a specimen of Abrotocrinus unicus. This "sea lily" has a small, bowl-shaped cup with multi-branching, pinnulated arms. To the right of this crinoid is Scytalocrinus disparilis. This crinoid has narrow, uniserial arms that display the pinnules. A lengthy portion of stem is attached to the cup and meanders underneath the Abrotocrinus. At the bottom of the plate is the unusual Camptocrinus crawfordsvillensis. This crown is always found obscured with fine cirri. This camerate crinoid has been beautifully prepared to show the actual crown of the crinoid. There are also several crinoid stems and a coral on the plate. The fossils have good color and contrast. They are well positioned on the rounded plate of siltstone. This is a nice multiple plate of crinoids from a world-famous site.
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