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Occurrences of Psigraptus and Chigraptus gen. nov. in the Tremadoc of the Yukon Territory, Canada

Published online by Cambridge University Press:  01 March 1999

D. E. JACKSON  and
A. C. LENZ
D. E. JACKSON
Affiliation:
NRG, Drummond Building, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK
A. C. LENZ
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, N6A 5B7, Canada
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Abstract

The full stratigraphical context of the type materials of Psigraptus arcticus and P. lenzi from Rock River are given, as well as a new occurrence of the Psigraptus–Adelograptus Zone in the Upper Canyon, Peel River of Canada's Yukon Territory. A new monotypic genus Chigraptus is created for a quadriradiate anisograptid graptolite with four unbranched first-order stipes, a horizontal to slightly reclined rhabdosome and isolate autothecae. The genus is found only at the base of the Early Tremadoc Anisograptus–Staurograptus Zone. Chigraptus may have given rise to the Late Tremadoc Psigraptus by a reduction in first-order stipes and by increased reclination.

Type
Research Article
Information
Geological Magazine , Volume 136 , Issue 2 , March 1999 , pp. 153 - 157
Copyright
© 1999 Cambridge University Press

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