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This is a partial crinoid crown. Prof. Gary Webster of Washington State University, Pullman, Washington has identified it as Aglaocrinus magnus, a species which has previously been reported from the Minturn Formation. [Strimple, H. L., and Moore, R. C., 1973, Middle Pennsylvanian crinoids from central Colorado, University of Kansas Paleontological Contributions, Paper 66, p. 8] The species has also been found in Oklahoma. It was previously called Ethelocrinus magnus. This specimen has been donated to the Denver Museum of Natural History. The scale is in cm. This particular specimen is shown in Figures 4.27 and 4.28 of Webster and Houck, 1998, Journal of Paleontology, vol. 72, p. 1054.
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