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Journal Article

The Brachiopod Zonal Indices of the Stages Costonian to Onnian in Britain

B. B. Bancroft
Journal of Paleontology
Vol. 19, No. 3 (May, 1945), pp. 181-252
Stable URL: http://www.jstor.org/stable/1299088
Page Count: 72

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Topics: Scars, Sinuses, Sandstones, Fossils, Mudstone, Heart valves, Quarries, Genera, Shales, Fauna
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The Brachiopod Zonal Indices of the Stages Costonian to Onnian in Britain
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Abstract

The stages Costonian to Onnian correspond roughly to the lower half of the Upper Ordovician as conceived in England. They embrace seven stages, the Costonian, Harnagian, Soudleyan, Longvillian, Marshbrookian, Actonian, and Onnian. These stages are subdivided into 32 zones. The zonal indices are chosen from the Dalmanellacea, Orthacea, and Strophomenacea. The brachiopod indices include 14 new species and varieties, of which four are referred to Onniella, five to Howellites (new subgenus in Resserella), two to Raymondella (new genus), two to Wattsella, and one to Dinorthis. Two new brachiopod genera, Soudleyella and Cryptothyris, are also described. The indices referred to Howellites, Raymondella, and Onniella lie upon well-established trend lines, their respective positions in the trend being defined by the statistical characters of the ribbing. The same method of definition is used in describing the other indices referred to Dalmanellacea.

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