Trilobites of the Upper Cambrian Ptychaspid biomere, Wilberns formation, central Texas
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Date
1970
Authors
Longacre, Susan Ann
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Publisher
University of Texas at Austin. Bureau of Economic Geology
Abstract
Trilobites collected during the past 20 years from the Morgan Creek, Point Peak, and San Saba Members of the Wilberns Formation comprise 89 species assigned to 45 genera belonging to zones of the upper Franconian and Trempealeauan Stages of the Upper Cambrian Croixan Series. New zonal names are proposed in the interest of a regionally applicable nomenclature. Although none of the zonal nomenclature is identical to that of the 1944 Cambrian Correlation Chart of Howell et al., the four zones recognized in central Texas are equivalent to the eight highest zones on the Chart.
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Reprint of Memoir 4, The Paleontological Society, supplement to Journal of Paleontology, v.44, no.1, January 1970.