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Middle Pennsylvanian, late Atokan-early Desmoinesian echinoderms from an intermontane basin, the Central Colorado Trough

Published online by Cambridge University Press:  14 July 2015

G. D. Webster
Affiliation:
Department of Geology, Washington State University, Pullman 99164-2812
Karen J. Houck
Affiliation:
Department of Geology, University of Colorado at Denver, Denver 80217-3364

Abstract

Middle Pennsylvanian, Atokan and Desmoinesian, crinoids and echinoids are described from the Belden and Minturn Formations of the Central Colorado Trough. The echinoderms from the Minturn Formation were living in an active intermontane trough setting. They are found in two environments, on the flanks of phylloid algal reefs and in patches on abandoned delta lobes on the gently sloping substrate. Faunas are dominated by cromyocrinids and are similar to stable platform Terrigineous Facies Belt faunas of the Midcontinent.

New species described are Dicromyocrinus beldenensis, Neoprotencrinus rockensis, and Sciadiocrinus wipsorum. Goleocrinus, and the columnal genera Blothronagma, Cyclocaudex, and Platyplateium are reported for the first time from the Minturn Formation. The columnal taxa Blothronagma cinctutum and Floricyclus angustimargo are believed to be cromyocrinids. B. cinctutum may be synonomous with Synarmocrinus molasensis, and Floricyclus angustimargo may be synonymous with Ulocrinus rockymontanus.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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