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Graptolites of the Sylvan Shale of Oklahoma and Polk Creek Shale of Arkansas

Charles E. Decker
Journal of Paleontology
Vol. 9, No. 8 (Dec., 1935), pp. 697-708
Stable URL: http://www.jstor.org/stable/1298188
Page Count: 12
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Graptolites of the Sylvan Shale of Oklahoma and Polk Creek Shale of Arkansas
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Abstract

The graptolites of the Sylvan shale of Oklahoma and some from the Polk Creek shale of Arkansas are described and illustrated. Eight species and varieties, two of which are new, and a fragment of another genus are included. The evidence seems to relate the Sylvan and Polk Creek shales closely with one another, and both of them with the upper Hartfell shales of Great Britain.

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