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Middle Devonian Crinoids from Western Maryland

Roger K. Pabian and Harrell L. Strimple
Journal of Paleontology
Vol. 50, No. 4 (Jul., 1976), pp. 759-762
Stable URL: http://www.jstor.org/stable/1303668
Page Count: 4
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Middle Devonian Crinoids from Western Maryland
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Abstract

Eight specimens of Lasiocrinus sp. cf. L. scoparius (Hall) and four specimens of Arthroacantha sp. cf. A. punctobrcchiata (Hall) on slabs are the first crinoids reported from the Marcellus Shale (Middle Devonian) of Maryland. The dorsal cup of L. scoparius from the Marcellus differs from typical L. scoparius in older rocks in New York and suggests a trend to shortening of the cup.

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