As the Paleozoic drew to a close in the Permian, crinoids were becoming a much less important constituent of the earth's fauna. By the end of the Permian, the inadunate, flexible and camerate crinoids had all become extinct. Only the articulate crinoids continued through the terminal Permian extinction into the Triassic. Several species of crinoids have been collected from strata of early Permian age that are exposed in southeastern Nebraska. Pabian and Strimple described some of the Permian crinoids from Nebraska in 1974.
References
- Heckel, P. H., and Pabian, R. K., 1981. Compatibility of crinoid faunas with eustatic model for deposition of Midcontinent Pennsylvanian cyclothems [abstract]: Geological Society of america, North-central section, 15th annual meeting, abstracts with program, v. 13, no 6, 281 p.
- Holterhoff, P. F., 1988, Paleobiology and paleoecology of crinoids from the lower Stanton Formation (Late Pennsylvanian, Missourian) of the Mid-continent United States: University of Nebraska-Lincoln, Department of Geology, unpublished master's thesis, 137 p.
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- Pabian, R. K., and Strimple, H. L., 1974, Part I. Some Pennsylvanian crinoids from Nebraska: Part II. Some Permian crinoids from Nebraska, Kansas, and Oklahoma: Bulletins of American Paleontology, v. 64, no. 281, p. 249 - 337.
- Pabian, R. K., and Strimple, H. L., 1978b, Delocrinus vastus Land and Webster from the Hughes Creek Shale (Lower Permian), Richardson County, Nebraska: Journal of Paleontology, v. 52, no. 6, p. 1393.
- Pabian, R. K., and Strimple, H. L., 1985, Classification, paleoecology, and biostratigraphy of crinoids from the Stull shale (Late Pennsylvanian) of Nebraska, Kansas, and Iowa. University of Nebraska State Museum Bulletin, 11, 81 p.
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- Strimple, H. L., and Watkins, W. T., 1969, Carboniferous crinoids of Texas with stratigraphic implications. Paleontographica Americana, v. VI, no. 40, p. 141-275.
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