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The Topazan Stage, a new Laurentian stage (Lincolnian series—“Middle” Cambrian)

Published online by Cambridge University Press:  20 May 2016

Frederick A. Sundberg
Frederick A. Sundberg*
Affiliation:
Show Low High School, Show Low, Arizona 85901, USA,
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Abstract

The Topazan Stage is proposed for the interval between the Delamaran Stage and the originally proposed base of the Marjuman Stage. The proposed stratotype of the lower boundary of the Topazan Stage occurs 2.6 m above the base of the upper shale member of the Chisholm Formation, Drum Mountains, Utah. This boundary occurs within a shale sequence and is marked by the first appearance of Proehmaniella basilica, which also coincides with the disappearance of the common corynexochid Glossopleura. This faunal turnover can be recognized in stratigraphic sections in western North America and Tennessee, but cannot be recognized outside of Laurentia. The base of the overlying Marjuman Stage is restored to its originally proposed boundary, the FAD of Ptychagnostus atavus.

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 1 , January 2005 , pp. 63 - 71
Copyright
Copyright © The Paleontological Society 

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