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Five New Varieties of Graptolites from Tennessee and Virginia
Charles E. Decker
Journal of Paleontology
Vol. 23, No. 2 (Mar., 1949), pp. 214-217
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1299698
Page Count: 4
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The following five new varieties of graptolites from the Athens shale are described and illustrated: Diplograptus (Glyptograptus) euglyphus elongatus, D. (Amplexograptus) maxwelli rarithecatus, D. (Orthograptus) truncatus longithecatus, Glossograptus ciliatus robustus, G. ciliatus sparsithecatus. The Athens shale, an Ordovician formation, extends from north-central Alabama northeastward across eastern Tennessee to northern Virginia. It may be seen in scores of outcrops in this area of intense folding and faulting. It varies in thickness from a few feet to several hundred feet. Butts (1940, p. 165) has indicated a range in thickness in Virginia of from 200 feet or less to about 4,000 feet, but has estimated that locally the thickness may reach 5,000 to 10,000 feet. The fauna consists chiefly of graptolites and a few brachiopods and trilobites. In the study of many hundreds of specimens of graptolites, five have been found which have characteristics differing from those of other described forms by an amount which entitles them to be recognized as distinct varieties.
Journal of Paleontology © 1949 SEPM Society for Sedimentary Geology