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Stage Names within the Llandovery Series

  • L. R. M. Cocks (a1), P. Toghill (a1) and A. M. Ziegler (a2)
Summary

Four stage names are erected within the southern part of the type area of the Llandovery Series, south-east of Llandovery, Carmarthenshire, Wales. They are Rhuddanian, to incorporate the existing Lower Llandovery; Idwian for the Middle Llandovery, and Fronian and Telychian for the Lower and Upper parts of the Upper Llandovery. Correlation with the sequence of graptolite zones is suggested.

The base of the Llandovery at Llandovery is poorly exposed and unfossiliferous, and detailed correlation with other areas may always remain uncertain. Thus the base of the Llandovery Series, and hence the base of the Silurian System, is defined in Lapworth's classic locality at Dobb's Linn, Moffat, Scotland, at the base of the zone of Glyptograptus persculptus.

Copyright
COPYRIGHT: © Cambridge University Press 1970
References
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Andrew, G. 1925. The Llandovery rocks of Garth, Breconshire. Q. Jl geol. Soc. Lond. 81, 389–406, pl. 22.
Cocks, L. R. M. & Rickards, R. B. 1969. Five boreholes from Shropshire and the relationships of shelly and graptolitic facies in the Lower Silurian. Q. Jl geol. Soc. Lond. 124, 213–238, pls. 9–11.
Cocks, L. R. M. & Walton, G. 1968. A large temporary exposure in the Lower Silurian of Shropshire. Geol. Mag. 105, 390–397.
Ingham, J. K. 1966. The Ordovician rocks in the Cautley and Dent districts of Westmorland and Yorkshire. Proc. Yorks. geol. Soc. 35, 455–505, pls. 25–28.
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, pls. 24, 25.
Jones, O. T. 1925. The Geology of the Llandovery District: Part 1. The Southern Area. Q. Jl geol Soc. Lond. 81, 344–388, pl. 21.
Jones, O. T. 1949. The Geology of the Llandovery District: Part II. The Northern Area. Q. Jl geol. Soc. Lond. 105, 43–64, pl. 3.
Lamont, A. 1952. Ecology and correlation of the Pentlandian – a new division of the Silurian System in Scotland. Rep. Int. geol. Congr. 18th Session, London, 10, 27–32.
Lapworth, C. 1878. The Moffat Series. Q. Jl geol. Soc. Lond. 34, 240–346.
Lapworth, C. 1879. On the tripartite classification of the Lower Palaeozoic rocks. Geol. Mag. (2) 6, 1–15.
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Murchison, R. I. 1859. Siluria. 2nd. ed. (labelled 3rd ed.). 592 p. 42 pls, London.
Toghill, P. 1968 a. The stratigraphical relationships of the earliest Monograptidae and the Dimorphograptidae. Geol. Mag. 105, 46–51, pl.1.
Toghill, P. 1968b. The graptolite assemblages and zones of the Birkhill Shales (Lower Silurian) at Dobb's Linn. Palaeontology. 11, 654–668.
Toghill, P. 1969. Discussion of the terms ‘Llandovery Series’ and ‘Valentian Series’ as time divisions of the Silurian. Proc. geol. Soc. Lond. 1651, 235–238.
Toghill, P. 1970. Highest Ordovician (Hartfell Shale) graptolite faunas from the Moffat area, south Scotland. Bull. Br. Mus. nat. Hist. (Geol.), 19, 1–27, pls. 1–16.
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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
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