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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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References

Cocks, L. R. M. & Fortey, R. A. 1988. Lower Palaeozoic facies and faunas around Gondwana. Geological Society of London, Special Publication 37, 183–200.CrossRefGoogle Scholar
Cooper, R. A. & Fortey, R. A. 1982. The Ordovician graptolites of Spitsbergen. Bulletin of the British Museum (Natural History), Geology 36, 157–302, 6 pls.Google Scholar
Elles, G. L. & Wood, E. M. R. 1901. A monograph of British graptolites, part 1, 1–54, pls 1–4. Monograph of the Palaeontographical Society (part of vol. 55 for 1901).CrossRefGoogle Scholar
Erdtmann, B.-D. 1965. Outline stratigraphy of graptolite-bearing 3b (Lower Ordovician) strata in the Oslo Region, Norway. Norsk Geologisk Tidsskrift 45, 481–547.Google Scholar
Fortey, R. A., Bassett, M. G., Harper, D. A. T., Hughes, R. A., Ingham, J. K., Molyneux, S. G., Owen, A. W., Owens, R. M., Rushton, A. W. A. & Sheldon, P. 1991. Progress and problems in the selection of strato-types for the bases of Ordovician series in the type area. Paper 90–9, Geological Survey of Canada (in press).Google Scholar
Jaanusson, V. 1982. Introduction to the Ordovician of Sweden. Paleontological Contributions from the University of Oslo 219, 1–10.Google Scholar
Jackson, D. E. 1978. The Skiddaw Group. In The Geology of the Lake District (ed. Moseley, F.), pp. 79–91. Yorkshire Geological Society Occasional Publication No. 3.Google Scholar
Jackson, D. E. 1979. A new assessment of the stratigraphy of the Skiddaw Group along the northern edge of the main Skiddaw inlier. Proceedings of the Cumberland Geological Society 4, 21–31.Google Scholar
Lee, C. K. & Chen, X. 1962. Cambrian and Ordovician graptolites from Sandu, Gueizhou (Kueichou). Acta Palaeontologica Sinica 10, 12–30, pls 1–3 [in Chinese, English summary].Google Scholar
Lindholm, K. 1991 a. Hunnebergian graptolites and bio-Stratigraphy in southern Scandinavia. Lund Publications in Geology 95, 1–36.Google Scholar
Lindholm, K. 1991 b Ordovician graptolites from the early Hunneberg of southern Scandinavia. Palaeontology 34 (in press).Google Scholar
Lindholm, K. & Maletz, J. 1989. Intraspecific variation and relationships of some Lower Ordovician species of the Dichograptid Clonograptus. Palaeontology 32, 711–43, pl. 83.Google Scholar
Molyneux, S. G. & Rushton, A. W. A. 1985. Discovery of Tremadoc rocks in the Lake District. Proceedings of the Yorkshire Geological Society 45, 123–7 (dated 1984).CrossRefGoogle Scholar
Molyneux, S. G. & Rushton, A. W. A. 1988. The age of the Watch Hill Grits (Ordovician), English Lake District: structural and palaeogeographical implications. Transactions of the Royal Society of Edinburgh: Earth Sciences 79, 43–69.CrossRefGoogle Scholar
Törnquist, S. L. 1901. Researches into the graptolites of the lower zones of the Scanian and Vestrogothian Phyllo-Tetragraptus Beds. Lunds Universitets Årsskrift 37 (2:5), 26 pp., 3 pls.Google Scholar
Williams, S. H. & Stevens, R. K. 1988. Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana 5, 167 pp., 37 pls.Google Scholar