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A revision of Ordovician series and stages from the historical type area

Published online by Cambridge University Press:  01 May 2009

R. A. Fortey ,
D. A. T. Harper ,
J. K. Ingham ,
A. W. Owen  and
A. W. A. Rushton
R. A. Fortey
Affiliation:
Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
D. A. T. Harper
Affiliation:
Department of Geology, University College, Galway, Republic of Ireland
J. K. Ingham
Affiliation:
Hunterian Museum and Department of Geology and Applied Geology, The University, Glasgow G12 8QQ, UK
A. W. Owen
Affiliation:
Hunterian Museum and Department of Geology and Applied Geology, The University, Glasgow G12 8QQ, UK
A. W. A. Rushton
Affiliation:
British Geological Survey, Keyworth, Nottinghamshire NG12 5GG, UK
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Abstract

This paper is a revision of the standard chronostratigraphy of the Ordovician of the historical type area in England and Wales. The revision is a response to the need for more precise definitions of series and stages, especially for practical international correlation. In some cases this has entailed moving horizons for Series bases away from those in the classical sections. The scheme will be used as the standard for a forthcoming revision of the Correlation Chart of the British Ordovician System. The Ordovician is divided into five series: Tremadoc, Arenig, Llanvirn, Caradoc and Ashgill. The Llanvirn is extended to include part of the classical Llandeilo Series, which is included within it as a stage. Where stage subdivisions of standard series have not yet been defined, as in the Tremadoc, they are proposed in this paper. However, Bancroft’s fine stadial divisions of the Caradoc, which have been criticized for their brevity and local utility, are combined into four new stages, which will have wider application. The former Caradoc subdivisions are retained as substages for the purposes of regional correlation.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 1 , January 1995 , pp. 15 - 30
Copyright
Copyright © Cambridge University Press 1995

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References

Amsden, T. W., 1974. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois and eastern Missouri. Bulletin of the Oklahoma Geological Survey 119, 1–154.Google Scholar
Amsden, T. W., & Barrick, J. E., 1986. Late Ordovician—Early Silurian strata in the central United States and the Hirnantian Stage. Bulletin of the Oklahoma Geological Survey 139, 1–95.Google Scholar
Bancroft, B. B., 1929 a. Some new genera and species of Strophomenacea from the Upper Ordovician of Shropshire. Memoir of the Manchester Literary and Philosophical Society 73, 33–65, pls 1, 2.Google Scholar
Bancroft, B. B., 1929 b. Some new species of Cryptolithus (s.l.)from the Upper Ordovician. Memoir of the Manchester Literary and Philosophical Society 73, 67–98, pls 1, 2.Google Scholar
Bancroft, B. B., 1933. Correlation Tables of the Stages Costonian-Onnian in England and Wales. 4 pp., 3 tables. Blakeney, Glos. (privately printed).Google Scholar
Bancroft, B. B., 1945. The Brachiopod zonal indices of the Stages Costonian to Onnian in Britain. Journal of Paleontology 19, 181–252, pls 22–38.Google Scholar
Barnes, C. R., 1992. The uppermost series of the Ordovician System. In Global Perspectives on Ordovician Geology (eds Webby, B. D. and Laurie, J. R.), pp. 185–92. Rotterdam: A. A. Balkema.Google Scholar
Bassett, M. G., 1985. Towards a ‘Common Language’ in Stratigraphy. Episodes 8, 87–92.CrossRefGoogle Scholar
Beckly, A., 1987. Basin development in North Wales during the Arenig. Geological Journal 22, 19–30.Google Scholar
Bergström, S. M., 1978. Middle and Upper Ordovician conodont and graptolite biostratigraphy of the Marathon, Texas, graptolite zone reference standard. Paleontology 21, 723–58.Google Scholar
Bergström, S. M., 1986. Biostratigraphic integration of Ordovician graptolite and conodont zones. In Palaeoecology and Biostratigraphy of Graptolites (eds Rickards, R. B. and Hughes, C. P.), pp. 61–78. Geological Society of London Special Publication no. 20.Google Scholar
Bergström, S. M., 1990. Biostratigraphic and biogeographic significance of Middle and Upper Ordovician conodonts in the Girvan Succession, South-West Scotland. Courier Forschungen-Institut Senkenberg 118, 1–43.Google Scholar
Bergström, S. M., & Orchard, M. J., 1985. Conodonts of the Cambrian and Ordovician Systems from the British Isles. In A Stratigraphical Index of Conodonts (eds Higgins, A. C. and Austin, R. L.), pp. 32–67. Chichester: Ellis Horwood.Google Scholar
Berry, W. B. N., 1992. A base for the Arenig: The Tetragraptus approximatus Zone. In Global Perspectives on Ordovician Geology (eds Webby, B. D. and Laurie, J. R.), pp. 123–34. Rotterdam: Balkema.Google Scholar
Brenchley, P. J., 1989. The late Ordovician extinction. In Mass Extinctions: Processes and Evidence (ed. Donovan, S. K.), pp. 104–32. New York: Columbia University Press.Google Scholar
Cave, R., 1965. The Nod Glas sediments of Caradoc age in North Wales. Geological Journal 4, 279–98.CrossRefGoogle Scholar
Cave, R., & Price, D., 1978. The Ashgill Series near Welshpool, North Wales, Geological Magazine 115, 183–94.Google Scholar
Chlupáč, I., Flügel, H., & Jaeger, H., 1981. Series or stages within Palaeozoic systems? Newsletters in Stratigraphy 10, 78–91.Google Scholar
Cocks, L. R. M., 1985. The Ordovician-Silurian boundary. Episodes 8, 98–100.Google Scholar
Cocks, L. R. M., & Rickards, R. B., (eds) 1988. A Global Analysis of the Ordovician-Silurian Boundary. Bulletin of the British Museum (Natural History) Geology no. 43, 394 pp.Google Scholar
Compston, W., & Williams, I. S., 1992. Ion probe ages for the British Ordovician and Silurian stratotypes. In Global Perspectives on Ordovician Geology (eds Webby, B. D. and Laurie, J. R.), pp. 59–67. Rotterdam: A. A. Balkema.Google Scholar
Cope, J. C. W., Ingham, J. K., & Rawson, P. F., (eds) 1992. Atlas of Palaeogeography and Lithofacies. Memoir of the Geological Society no. 13, 153 pp.Google Scholar
Cowie, J. W., 1986. Guidelines for boundary stratotypes. Episodes 9, 78–82.Google Scholar
Cowie, J. W., Rushton, A. W. A., & Stubblefield, C. J., 1972. A correlation of Cambrian rocks in the British Isles. Special Report of the Geological Society of London no. 2, 42 pp.Google Scholar
Dean, W. T., 1958. The faunal succession in the Caradoc Series of south Shropshire. Bulletin of the British Museum (Natural History), Geology 3, 191–231.Google Scholar
Elles, G. L., 1922. The Bala country: its structure and rock succession. Quarterly Journal of the Geological Society of London 78, 132–75.Google Scholar
Elles, G. L., 1925. The characteristic assemblages of the graptolite zones of the British Isles. Geological Magazine 62, 337–47.Google Scholar
Finney, S. C., & Bergström, S. M., 1986. Biostratigraphy of the Ordovician Nemagraptus gracilis Zone. In Palaeoecology and Biostratigraphy of Graptolites (eds Hughes, C. P. and Rickards, R. B.), pp. 47–59. Geological Society of London Special Publication no. 20.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. R., 1991. Progress and problems in the selection of stratotypes for the bases of series of the Ordovician System of the historical type area in the U.K. In Advances in Ordovician Geology (eds Barnes, C. R. and Williams, S. H.), pp. 5–25. Geological Survey of Canada Paper no. 90–9.Google Scholar
Fortey, R. A., Beckly, A. J., & Rushton, A. W. A., 1990. International correlation of the base of the Llanvirn Series, Ordovician System. Newsletters in Stratigraphy 22, 119–42.Google Scholar
Fortey, R. A., & Owens, R. M., 1978. Early Ordovician (Arenig) stratigraphy and faunas of the Carmarthen District, south-west Wales. Bulletin of the British Museum (Natural History) Geology 30, 225–94.Google Scholar
Fortey, R. A., & Owens, R. M., 1987. The Arenig Series in South Wales. Bulletin of the British Museum (Natural History) Geology 41, 69–307.Google Scholar
Fortey, R. A., & Owens, R. M., 1990. Arenig biostratigraphy and correlation in the Welsh Basin. Journal of the Geological Society, London 146, 607–10.CrossRefGoogle Scholar
Fortey, R. A., & Owens, R. M., 1991. A trilobite fauna from the highest Shineton Shales in Shropshire, and the correlation of the latest Tremadoc. Geological Magazine 128, 437–64.Google Scholar
Fortey, R. A., & Owens, R. M., 1992. The Habberley Formation: youngest Tremadoc in the Welsh Borderland. Geological Magazine 129, 553–66.Google Scholar
Goldman, D., Mitchell, C. E., Bergström, S. M., Delano, J. W., & Tice, S., 1994. K-bentonites and graptolite biostratigraphy in the Middle Ordovician of New York State and Quebec: a new biostratigraphic model. Palaios 9, 124–43.Google Scholar
Harland, W. B., Armstrong, R. L., Cox, A. V., Craig, L. W., Smith, A. G., & Smith, D. G., 1989. A Geologic Timescale. Cambridge: Cambridge University Press, 263 pp.Google Scholar
Harper, D. A. T., 1981. The stratigraphy and faunas of the Upper Ordovician High Mains Formation of the Girvan District. Scottish Journal of Geology 17,247–55.Google Scholar
Harper, D. A. T., Owen, A. W., & Williams, S. H., 1985. The Middle Ordovician of the Oslo Region, Norway, 34. The type Nakholmen Formation (upper Caradoc), Oslo and its faunal significance. Norsk Geologisk Tidsskrift 64,293–312.Google Scholar
Harper, J. C., 1956. The Ordovician succession near Llanystwmdwy, Caernarvonshire. Liverpool and Manchester Geological Journal 1, 385–93.Google Scholar
Henningsmoen, G., 1973. The Cambro-Ordovician boundary. Lethaia 6, 432–9.Google Scholar
Huff, W. D., Bergström, S. M., & Kolata, D. R., 1992. Gigantic Ordovician volcanic ash fall in North America and Europe: biological, tectonomagmatic, and eventstratigraphic significance. Geology 20, 875–8.Google Scholar
Hughes, R. A., 1989. Llandeilo and Caradoc graptolites of the Builth and Shelve inliers. Palaeontographical Society Monograph, 1–89, pls 1–5.Google Scholar
Hurst, J. M., 1979 a. The stratigraphy and brachiopods of the upper part of the type Caradoc of south Salop. Bulletin of the British Museum (Natural History) Geology 32, 183–304.Google Scholar
Hurst, J. M., 1979 b. Evolution, succession and replacement in the type upper Caradoc (Ordovician) benthic faunas of England. Palaeogeography, Palaeoclimatology, Palaeoecology 27, 189–246.Google Scholar
Ingham, J. K., 1966. The Ordovician rocks of the Cautley and Dent districts of Westmorland and Yorkshire. Proceedings of the Yorkshire Geological Society 35, 455–505.Google Scholar
Ingham, J. K., 1970–7. A monograph of the upper Ordovician trilobites from the Cautley and Dent districts of Westmorland and Yorkshire. Palaeontographical Society Monograph (1) 1970, 1–58, pls 1–9; (2) 1974, 59–87, pls 10–18; (3) 1977. 89–121, pls 19–27.Google Scholar
Ingham, J. K., 1978. Geology of a continental margin. 2. Middle and late Ordovician transgression, Girvan. In Crustal Evolution in Northwestern Britain and Adjacent Areas (eds Bowes, D. R. and Leake, B. E.), pp. 163–76. Geological Journal Special Issue no. 10.Google Scholar
Ingham, J. K., & Wright, A. D., 1970. A revised classification of the Ashgill series. Lethaia 3, 233–42.Google Scholar
Jenkins, W. A. M., 1967. Ordovician chitinozoa from Shropshire. Palaeontology 10, 436–88.Google Scholar
King, W. B. R., 1923. The Upper Ordovician rocks of the south-western Berwyn Hills. Quarterly Journal of the Geological Society of London 79, 487–507.Google Scholar
Lapworth, C., 1879. On the tripartite division of Lower Palaeozoic rocks. Geological Magazine 6, 1–15.CrossRefGoogle Scholar
Lynas, B. D. T., 1973. The Cambrian and Ordovician rocks of the Migneint area, North Wales. Journal of the Geological Society of London 129, 481–503.Google Scholar
Maletz, J., Rushton, A. W. A., & Lindholm, K., 1991. A new early Ordovician Didymograptid and its bearing on the correlation of the Skiddaw Group of England with the Toyen Shale of Scandinavia. Geological Magazine 128, 335–43.CrossRefGoogle Scholar
Marr, J. E., 1905. Anniversary address [The classification of the sedimentary rocks]. Quarterly Journal of the Geological Society of London 61, lxi–lxxxvi.Google Scholar
Marr, J. E., 1913. The Lower Palaeozoic rocks of the Cautley district. Quarterly Journal of the Geological Society of London 69, 1–18.CrossRefGoogle Scholar
Marr, J. E., 1916. The Ashgillian succession in the tract to the west of Coniston Lake. Quarterly Journal of the Geological Society of London 71, 189–204.Google Scholar
McNamara, K. J., 1979 a. Trilobites of the Coniston Limestone Group of the Lake District, England. Palaeontology 22, 53–92, pls 7–12.Google Scholar
McNamara, K. J., 1979 b. The age, stratigraphy and genesis of the Coniston Limestone Group in the southern Lake District. Geological Journal 14, 41–68.Google Scholar
Mitchell, C. E., 1987. Evolution and phylogenetic classification of the Diplograptacea. Palaeontology 30, 353–405.Google Scholar
Mitchell, C. E., 1992. Evolution of the Diplograptacea and the international correlation of the Arenig-Llanvirn boundary. In Global Perspectives on Ordovician Geology (eds Webby, B. D. E. and Laurie, J. R.), pp. 171–84. Rotterdam: Balkema.Google Scholar
Molyneux, S. K., & 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.Google Scholar
Norford, B. S., 1988. Introduction to papers on the Cambrian-Ordovician boundary. Geological Magazine 125, 323–6.Google Scholar
Orchard, M. J., 1980. Upper Ordovician conodonts from England and Wales. Geologica et Palaeontologica 14, 9–44.Google Scholar
Owen, A. W., 1978. The Ordovician and Silurian stratigraphy of Central Hadeland, South Norway. Norges Geologiske Undersekelse 338, 1–23.Google Scholar
Owen, A. W., 1980. Species of Tretaspis (Trilobita) from the upper Ordovician of the Oslo Region, Norway. Palaeontology 23, 715–47, pls 89–93.Google Scholar
Owen, A. W., 1987. The trilobite Tretaspis at the Middle-Upper Ordovician boundary in Västergötland. Geologiska Föreningens i Stockholm Förhandlingar 109, 259–66.Google Scholar
Owen, A. W., Bruton, D. L., Bockelie, J. F., & Bockelie, T. G., 1990. The Ordovician Successions of the Oslo Region, Norway. Norges Geologiske Undersokelse Special Publication no. 4, 54 pp.Google Scholar
Owen, A. W., Harper, D. A. T., & Rong, Jia-Yu, 1991. Hirnantian trilobites and brachiopods in space and time. In Advances in Ordovician Geology (eds Barnes, C. R. and Williams, S. H.), pp. 179–90. Geological Survey of Canada Paper no. 90–9.Google Scholar
Owen, A. W., & Ingham, J. K., 1988. The stratigraphical distribution and taxonomy of the trilobite Onnia in the type Onnian Stage of the type Caradoc. Palaeontology 31, 829–55.Google Scholar
Price, D., 1973 a. The age and stratigraphy of the Sholeshook Limestone of southwest Wales. Geological Journal 8, 225–46.Google Scholar
Price, D., 1973 b. The Phillipsinella parabola-Staurocephalus clavifrons fauna and Upper Ordovician correlation. Geological Magazine 110, 535–41.Google Scholar
Price, D., 1977. Species of Tretaspis (Trilobita) from the Ashgill Series in Wales. Palaeontology 20, 763–92, pls 98–103.Google Scholar
Price, D., 1980. A revised age and correlation for the topmost Sholeshook Limestone Formation (Ashgill) of South Wales. Geological Magazine 117, 485–9.Google Scholar
Price, D., 1981. Tretaspis radialis Lamont and allied species (Trilobita). Geological Magazine 118, 289–95.CrossRefGoogle Scholar
Price, D., 1984. The Pusgillian Stage in Wales. Geological Magazine 121, 99–105.Google Scholar
Pugh, W. J., 1923. The geology of the district around Corris and Aberllefenni (Merionethshire). Quarterly Journal of the Geological Society of London 79, 508–41.Google Scholar
Rong, Jia-Yu, & Harper, D. A. T., 1988 a. A global synthesis of the latest Ordovician Hirnantian brachiopod faunas. Transactions of the Royal Society of Edinburgh: Earth Sciences 79, 383–402.Google Scholar
Rong, Jia-Yu, & Harper, D. A. T., 1988 b. The Ordovician-Silurian boundary and the Hirnantia fauna. Lethaia 21, 168.Google Scholar
Ross, R. J., 1982. The Ordovician System in the United States: Correlation Chart and Explanatory Notes. International Union of Geological Sciences, Publication no. 12, 73 pp.Google Scholar
Rushton, A. W. A., 1982. The biostratigraphy and correlation of the Merioneth—Tremadoc Series boundary in North Wales. In The Cambrian Ordovician Boundary (eds Bassett, M. G. and Dean, W. T.), pp. 41–60. Cardiff: National Museum of Wales.Google Scholar
Rushton, A. W. A., 1985. A Lancefieldian graptolite from the Lake District. Geological Magazine 122, 329–33.Google Scholar
Rushton, A. W. A., 1988. Tremadoc trilobites from the Skiddaw Group in the English Lake District. Palaeontology 31, 677–98.Google Scholar
Savage, N. M., & Bassett, M. G., 1985. Caradoc—Ashgill conodont faunas from Wales and the Welsh Borderland. Palaeontology 28, 679–713.Google Scholar
Skevington, D., 1963. A correlation of Ordovician graptolite-bearing sequences. Geologiska Foreningens i Stockholm Forhandlingar 85, 218–319.Google Scholar
Stubblefield, C. J., 1930. Palaeozoic rocks in Shropshire. Summary of Progress of the Geological Survey of Great Britain for 1929. I, 87–8.Google Scholar
Sweet, W. C., & Bergström, S. M., 1971. The American Upper Ordovician standard. XIII. A revised timestratigraphic classification of North American Upper Middle and Upper Ordovician rocks. Bulletin of the Geological Society of America 82, 613–28.Google Scholar
Toghill, P., 1970. Highest Ordovician (Hartfell Shale) graptolite faunas from the Moffat Area, South Scotland. Bulletin of the British Museum (Natural History) Geology 19, 1–27.Google Scholar
Tripp, R. P., Zhou, Z., & Pan, Z., 1989. Trilobites from the Upper Ordovician Tangtou Formation, Jiangsu Province, China. Transactions of the Royal Society of Edinburgh: Earth Sciences 80, 25–68.Google Scholar
Tucker, R. D., Krogh, T. E., Ross, R. J. Jr, & Williams, S. H., 1990. Time-sale calibration by high-precision U-Pb zircon dating of interstratified volcanic ashes in the Ordovician and Lower Silurian stratotypes of Britain. Earth and Planetary Science Letters 100, 51–58.Google Scholar
Turner, R. E., 1984. Acritarchs from the type area of the Ordovician Caradoc Series, Shropshire, England. Palaeontographica, Abt. B 190, 87–157.Google Scholar
Twenhofel, W. H., 1928. Geology of Anticosti Island. Memoirs of the Geological Survey Branch, Canada no. 154, 481 pp.Google Scholar
Wang, K., Orth, C. J., Attrep, M. Jr, Chatterton, B. D. E., Wang, X., & Li, J., 1993. The great latest Ordovician extinction on the South China Plate: chemostratigraphic studies of the Ordovician-Silurian boundary interval on the Yangtze Platform. Palaeogeography, Palaeoclimatology, Palaeoecology 104, 61–79.Google Scholar
Whittard, W. F., 1955. The Ordovician Trilobites of the Shelve Inlier, West Shropshire. Palaeontographical Society Monograph (1), 1–40, pls 1–4.Google Scholar
Whittard, W. F., 1967. The Ordovician trilobites of the Shelve Inlier, west Shropshire. Palaeontographical Society Monograph (9), 305–52.Google Scholar
Whittard, W. F., 1979. An account of the Ordovician rocks of the Shelve Inlier in west Salop and part of north Powys (compiled by W. T. Dean). Bulletin of the British Museum (Natural History) Geology 33, 1–69.Google Scholar
Whittington, H. B., Dean, W. T., Fortey, R. A., Richards, R. B., Rushton, A. W. A., & Wright, A. D., 1984. Definition of the Tremadoc Series and the series of the Ordovician System in Britain. Geological Magazine 121, 17–33.Google Scholar
Williams, A., Strachan, I., Bassett, D. A., Dean, W. T., Ingham, J. K., Wright, A. D., & Whittington, H. B., 1972. A Correlation of the Ordovician rocks in the British Isles. Geological Society of London Special Report no. 3, 74 pp.Google Scholar
Williams, S. H., 1983. The Ordovician-Silurian boundary graptolite fauna of Dob’s Linn, southern Scotland. Palaeontology 26, 605–39.Google Scholar
Williams, S. H., 1987. Upper Ordovician graptolites from the D. complanatus Zone of the Moffat and Girvan districts and their significance for correlation. Scottish Journal of Geology 23, 65–92.Google Scholar
Williams, S. H., Barnes, C. R., O’Brien, F. M. C., & Boyce, W. D., 1994. A proposed global stratotype for the second series of the Ordovician system: Cow Head Peninsula, western Newfoundland. Bulletin of Canadian Petroleum Geology 42, 219–31.Google Scholar
Williams, S. H., & Bruton, D. L., 1983. The Caradoc-Ashgill boundary in the central Oslo Region and associated graptolite faunas. Norsk Geologisk Tidsskrift 63, 147–91.Google Scholar
Williams, S. H., & Stevens, R. K., 1988. Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana 5, 1–167.Google Scholar
Woodcock, N. H., 1990. Sequence stratigraphy of the Palaeozoic Welsh basin. Journal of the Geological Society, London 147, 537–47.Google Scholar
Wright, A. D., 1985. The Ordovician-Silurian boundary at Keisley, northern England. Geological Magazine 122, 261–73.Google Scholar
Zalasiewicz, J., 1984. A re-examination of the type Arenig Series. Geological Journal 19, 105–24.Google Scholar