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The Evolution of the Earliest Llandovery monograptids

Published online by Cambridge University Press:  01 May 2009

Jana Hutt  and
R. B. Rickards
Jana Hutt
Affiliation:
Department of Geology, University of Leicester
R. B. Rickards
Affiliation:
Sedgwick Museum, Cambridge, CB2 3EQ
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Abstract

The incommodus, atavus and cyphus monograptid groups appear more or less simultaneously in the atavus Zone. The atavus and cyphus groups are related, one of these probably giving rise to the later tenuis group of monograptids, Possible roots of these groups and relationships with later monograptids are discussed. Monograptus strachani sp. nov. is proposed to replace the name M. incommodus sensu Elles & Wood.

Type
Articles
Information
Geological Magazine , Volume 107 , Issue 1 , January 1970 , pp. 67 - 77
Copyright
Copyright © Cambridge University Press 1970

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References

REFERENCES

Elles, G. L. & Wood, E. M. R. 1901–18. Monograph of British Graptolites. Palaeontogr. Soc. (Monogr.).Google Scholar
Hutt, J. 1968. A redescription of the Llandoverian monograptid ‘Graptolithus’ tenuis, Portlock, 1843. Geol. Mag. 105, 251–255.CrossRefGoogle Scholar
Jones, O. T. 1909. The Hartfell-Valentian Succession in the District around Plynlimon and Pont Erwyd, North Cardiganshire. Q. Jl geol. Soc. Lond. 65, 463–537.CrossRefGoogle Scholar
Lapworth, C. 1876. On Scottish Monograptidae. Geol. Mag. 13, 308–321, 350–360, 499–507.CrossRefGoogle Scholar
Lapworth, C. 1880. On the geological distribution of the Rhabdophora. pt. 3, Results, and pt. 4, Conclusions. Ann. Mag. nat. Hist. (5), 6, 16–29, 185–207.CrossRefGoogle Scholar
Rickards, R. B. & Rushton, A. W. A. 1968. The thecal form of some slender Llandovery Monograptus. Geol. Mag. 105, 264–274.CrossRefGoogle Scholar
Sudbury, M. 1958. Triangulate monograptids from the Monograptus gregarius Zone (Lower Llandovery) of the Rheidol Gorge (Cardiganshire). Phil. Trans. R. Soc. Ser. B, 241 (685), 485–555.Google Scholar
Toghill, P. 1968. The stratigraphical relationships of the earliest monograptidae, and the dimorphograptidae. Geol. Mag. 105, 46–51.CrossRefGoogle Scholar
Törnquist, S. L. 1899. Researches into the Monograptidae of the Scanian Rastrites Beds. Lunds Univ. Arsskrift, 35, 1–25.Google Scholar