Name:
Glyptocrinus decadactylus
Age: Ordovician
Formation: Fairmont Formation
Location: Kentucky
Size: Plate is 5.4 inches across
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Here is a very aesthetic plate of Ordovician crinoids. These are Glyptocrinus decadactylus from Kentucky. There are three detailed examples of this crinoid on the plate. These camerate crinoids have a large, urn-shaped cup with extremely stellate plates. The long, thin, uniserial arms are present and easily seen. All of the crinoids have portions of stem tightly attached to the cup, one stem is extremely long. The cream-colored echinoderms contrast nicely with the blue-gray matrix. The sea lillies are beautifully showcased on the large, natural plate of shale. This is a nice multiple example of this classic Ordovician crinoid.
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