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A Conodont Fauna from the Keyser Limestone of Virginia and West Virginia
Charles T. Helfrich
Journal of Paleontology
Vol. 52, No. 5 (Sep., 1978), pp. 1133-1142
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1303859
Page Count: 10
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The first occurrence locally of Icriodus woschmidti in the topmost beds of the Keyser Limestone or the basal beds of the New Creek Limestone fixes the top of the Ozarkodina steinhornensis eosteinhornensis Zone for the Central Appalachians. This indicates that the Silurian-Devonian boundary could occur as high as the top of the Keyser Limestone for this region. The first reported occurrence of Ozarkodina steinhornensis scanica Jeppsson outside of Scandinavia extends the range of this species from the lower through the topmost beds of the Ozarkodina steinhornensis eosteinhornensis Zone. Comparison of the conodont and brachiopod zonations in the Central Appalachians and a review of conodont studies from the Roberts Mountains Formation (Nevada) creates reasonable doubt about the precision that can be obtained when intercontinental correlation of the recently defined Silurian-Devonian stratotype is attempted.
Journal of Paleontology © 1978 SEPM Society for Sedimentary Geology