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A new early Ordovician Didymograptid, and its bearing on the correlation of the Skiddaw Group of England with the Tøyen Shale of Scandinavia

Published online by Cambridge University Press:  01 May 2009

J. Maletz ,
A. W. A. Rushton  and
K. Lindholm
J. Maletz
Affiliation:
Technical University of Berlin, Institute of Geology and Palaeontology, Sekr. EB 10, Ernst Reuter Platz 1, D-1000 Berlin 10, Germany
A. W. A. Rushton
Affiliation:
British Geological Survey, Keyworth, Nottingham NG12 5GG, U.K.
K. Lindholm
Affiliation:
Department of Historical Geology and Palaeontology, Sölvegatan 13, S-223 62 Lund, Sweden
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Abstract

Didymograptus (s.l.) rigoletto sp.nov. is a distinctive species in the balticus group of didymograptids occurring in the Tøyen Shale (Lower Ordovician). In three localities in Sweden it has a short range near the top of the range of Tetragraptus phyllograptoides, and it occurs at about the same level at localities in the Oslo region, Norway; at most of these localities it occurs within the range of Tetragraptus of the approximatus group. Its presence in the Skiddaw Group of the English Lake District indicates the occurrence there of the basal Arenig (sensu lato), equivalent to the T. phyllograptoides Biozone of Scandinavia and the T. approximatus Biozone (= Lancefieldian 3) of the Australasian succession.

Type
Articles
Information
Geological Magazine , Volume 128 , Issue 4 , July 1991 , pp. 335 - 343
Copyright
Copyright © Cambridge University Press 1991

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