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Biostratigraphy, paleoecology, and taxonomy of Devonian (Emsian and Famennian) crinoids from southeastern Morocco

Published online by Cambridge University Press:  20 May 2016

G. D. Webster ,
R. Thomas Becker  and
Christopher G. Maples
G. D. Webster
Affiliation:
Department of Geology, Washington State University, Pullman, Washington 99163-2812 USA,
R. Thomas Becker
Affiliation:
Geologisch-Paläontologisches Institut, Westfälische Wilhelms-Universität, Corrensstr. 24, D-48149 Münster, Germany,
Christopher G. Maples
Affiliation:
Desert Research Institute, 2215 Raggio Parkway, Reno, Nevada 89512,
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Abstract

An early late Emsian codiacrinid and Frasnian specimens of an indeterminate species of Parapisocrinus, an undesignated new genus of a catillocrinid, and two amabilicrinids are described from the eastern part of the Anti-Atlas Mountains of Morocco. These are the first articulated crinoid specimens reported from the Famennian of Morocco. Specimens occur within ammonoid-rich dysoxic shales, marls, and thin limestones at Ouidane Chebbi, Jebel Mrakib, Lambidia, and Rich Bou Kourazia. Parapisocrinus, the codiacrinid, and the catillocrinid are loose cups that are associated with other megafossils and may have been transported within the pelagic depositional settings. The amabilicrinids occur in three small unitaxial lenses, two of which have associated logs. The problems with and possibility of a pseudoplanktic lifestyle for stemmed crinoids are discussed.

These new collections expand the known stratigraphic and geographic distribution of the pisocrinid and amabilicrinids and the early evolutionary history of the catillocrinids. New taxa introduced are the amabilicrinids Mrakibocrinus bockwinkeli, Moroccocrinus ebbighauseni, and the codiacrinid Elicrinus? weyeri.

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 6 , November 2005 , pp. 1052 - 1071
Copyright
Copyright © The Paleontological Society 

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