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Interreef crinoid fauna from the Mississinewa Shale Member of the Wabash Formation (Northern Indiana; Silurian; Echinodermata)
Published online by Cambridge University Press: 14 July 2015
Abstract
A true interreef crinoid fauna lacking components of reefal facies is reported from the Ludlovian of the Mississinewa Shale Member of the Wabash Formation in northern Indiana. The Mississinewa facies that contains this fauna is a dolomitic siltstone or a silty dolomite. The crinoid association reported is composed entirely of new species and is different from other reef and reef-associated, interreef, and non-reef crinoid associations. New species described, herein, include the following: Dimerocrinites (Eucrinus) ankylos n. sp., Periechocrinus shaveri n. sp., Bohemicocrinus? occidens n. sp., Macrostylocrinus styo n. sp., M. homalos n. sp., Gissocrinus hypselos n. sp., and Dendrocrinus diaphoros n. sp. This may be the first occurrence of Bohemicocrinus from outside Bohemia.
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