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Classification paleoecology and biostratigraphy of crinoids from the stull shale late pennsylvanian of nebraska kansas and iowa usa


Classification paleoecology and biostratigraphy of crinoids from the stull shale late pennsylvanian of nebraska kansas and iowa usa



Bulletin of the University of Nebraska State Museum 11(1): 1-81



Crinoids [13 spp.] representing the families Diphuicrinidae, Catacrinidae, Pirasocrinidae, Erisocrinidae, Cromyocrinidae, Cymbiocrinidae, Scytalocrinidae and Ampelocrinidae were collected from the Stull Shale Member of the Kanwaka Formation in the Shawnee Group of the Virgil Series (Upper Pennsylavanian) from near Weeping Water and Plattsmouth, Nebraska and near Pacific Junction, Iowa. Exposures of the Stull Shale near Melvern, Kansas, have yielded 14 spp. of crinoids representing the families Diphuicrinidae, Catacrinidae, Pirasocrinidae, Lophocrinidae Allagecrinidae, Cymbiocrinidae, Erisocrinidae, Apographiocrinidae and Stellarocrinidae. All but 2 of the species present in the Stull Shale have been previously reported from other stratigraphic horizons, including the Vinland Shale in Kansas, the Iola and Winterset Limestones in Kansas, the Plattsburg, Oread, and Lecompton Formations of Nebraska and Iowa, the Kanawa Formation of Oklahoma, the Harpersville, Brad and Mineral Wells Formations of Texas. Differences in the Stull crinoid faunas between Kansas and Nebraska, as well as differences in associated faunas, indicate that 2 separate fossil assemblages having few species in common are being studied, although both assemblages are typical of the crinoids in the nearshore shale of a cyclothem. The Kansas assemblage may represent crinoids of a deltaic biofacies, and the Nebraska-Iowa assemblage may represent a biofacies less influenced by detritus and farther away from the source area. Nearshore shales of midcontinent cyclothems, as described by Heckel and Baesemann (1975) and Heckel (1977), contain a different crinoid and total macroinvertebrate assemblage than do the offshore deposits of the same cyclothem. Nearshore shales contain large, ornate crinoid species and macroinvertebrates; the transgressive limestones and offshore shales contain small, inornate species of crinoids and associated macroinvertebrates. These crinoid assemblages formerly were termed "Type I" and "Type II" by Pabian and Strimple (1970) but are here referred to as shallow water or nearshore, and deep water or offshore assemblages, respectively. Parallelism is demonstrated for the species Graffhamicrinus decapodos (Strimple and Priest) and Delocrinus vulgatus Moore and Plummer. Three species, D. vulgatus Moore and Plummer, G. subcoronatus (Moore and Plummer) and G. magnificus (Strimple) are morphologically but not biometrically separable. Oklahomacrinus Moore, 1939, is restricted to include only those forms with cups having basal planes formed by the medial portion of the basal plates. ADACRINUS gen. nov. [type species: O. loeblichi], SARDINOCRINUS [type species: O. obruptus] and KANSACRINUS [type species: O. cirrifernus] are erected to include other species formerly assigned to unrestricted Oklahomacrinus but now excluded from restricted Oklahomacrinus. Hydriocrinus acehillensis sp. nov. is described from the Stull Shale of Nebraska.

Accession: 004962976

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Related references

Classification, paleoecology, and biostratigraphy of crinoids from the Stull Shale (Late Pennsylvanian) of Nebraska, Kansas, and Iowa. Bulletin of the University of Nebraska State Museum 11(1): 1-81, 1985

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