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Graptolites in British stratigraphy

Published online by Cambridge University Press:  09 September 2009

J. A. ZALASIEWICZ ,
L. TAYLOR ,
A. W. A. RUSHTON ,
D. K. LOYDELL ,
R. B. RICKARDS  and
M. WILLIAMS
J. A. ZALASIEWICZ*
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
L. TAYLOR
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
A. W. A. RUSHTON
Affiliation:
Department of Paleontology, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
D. K. LOYDELL
Affiliation:
School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK
R. B. RICKARDS
Affiliation:
Department of Earth Sciences, University of Cambridge, Sedgwick Museum, Downing Street, Cambridge CB2 3EQ, UK
M. WILLIAMS
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
*
†Author for correspondence: [email protected]
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Abstract

697 taxa of planktonic graptolites are recorded, and their stratigraphical ranges are given, through 60 biozones and subzones in the Ordovician and Silurian strata of England, Wales and Scotland, in the first such stratigraphical compilation for Great Britain since the synthesis of Elles & Wood (1901–1918).

Keywords

graptolitesgraptolite zonesbiozonesbiostratigraphyBritain
Type
Original Article
Information
Geological Magazine , Volume 146 , Issue 6 , November 2009 , pp. 785 - 850
Copyright
Copyright © Cambridge University Press 2009

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References

Armstrong, H. A., Rushton, A. W. A., Owen, A. W. & Floyd, J. D. 1998. Biostratigraphy of the Currarie Formation on the northwestern edge of the Southern Uplands – implications for the cessation of basic volcanism. Scottish Journal of Geology 34, 119–25.CrossRefGoogle Scholar
Baker, S. J. 1981. The graptolite biostratigraphy of a Llandovery outlier near Llanystumdwy, Gwynedd, North Wales. Geological Magazine 118, 355–65.CrossRefGoogle Scholar
Barclay, W. J., Davies, J. R., Humpage, A. J., Waters, R. A., Wilby, P. R., Williams, M. & Wilson, D. 2005. Geology of the Brecon district – A brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 000 Sheet 213 Brecon (England and Wales).Google Scholar
Barnes, R. P. 2008. Geology of the Whithorn, Kirkcowan and Wigtown district: memoir for 1:50,000 geological sheets 2, 4W and 4E (Scotland). Nottingham, UK: British Geological Survey, 146 pp.Google Scholar
Barrande, J. 1850. Graptolites de Bohême. Published by the author, Prague.Google Scholar
Bassett, M. G. 1985. Towards a ‘Common Language’ in stratigraphy. Episodes 8, 87–92.CrossRefGoogle Scholar
Bassett, M. G., Rickards, R. B. & Warren, P. T. 1975. The type Wenlock Series. Report of the Institute of Geological Sciences 75 /13, i–iv, 1–19.Google Scholar
Bates, D. E. B. & Kirk, N. H. 1984. Autecology of Silurian graptoloids. Special Papers in Palaeontology 32, 121–39.Google Scholar
Bates, D. E. B. & Kirk, N. H. 1985. Graptolites, a fossil case-history of evolution from sessile, colonial animals to automobile superindividuals. Proceedings of the Royal Society of London, Series B 228, 207–24.Google Scholar
Beckly, A. J. 1988. The stratigraphy of the Arenig Series in the Aberdaron to Sarn area, western Llyn, North Wales. Geological Journal 23, 321–37.CrossRefGoogle Scholar
Beckly, A. J. & Maletz, J. 1991. The Ordovician graptolites Azygograptus and Jishougraptus in Scandinavia and Britain. Palaeontology 34, 887–925.Google Scholar
Bergström, S. M., Löfgren, A. & Maletz, J. 2004. The GSSP of the Second (Upper) Stage of the Lower Ordovician Series: Diabasbrottet at Hunneberg, Province of Västergötland, Southwestern Sweden. Episodes 27, 265–72.CrossRefGoogle Scholar
Berry, W. B. N. & Boucot, A. J. 1972. Silurian graptolite depth zonation. Proceedings of the 24th International Geological Congress, Montreal 7, 59–65.Google Scholar
Bettley, R., Fortey, R. A. & Siveter, D. J. 2001. High-resolution correlation of Anglo-Welsh Middle to Upper Ordovician sequences and its relevance to international chronostratigraphy. Journal of the Geological Society, London 158, 937–52.CrossRefGoogle Scholar
Bjerreskov, M. 1975. Llandoverian and Wenlockian graptolites from Bornholm. Fossils & Strata 8, 94 pp.Google Scholar
Bolton, J. 1899. The palaeontology of the Manx Slates of the Isle of Man. Memoirs and Proceedings of the Manchester Literary and Philosophical Society 43, 1–15.Google Scholar
Bouček, B. 1953. Biostratigraphy, development and correlation of the Želkovice and Motol Beds in the Silurian of Bohemia. Sborník Ústředního Ústavu Geologického 20, 473–80.Google Scholar
Bouček, B. 1960. Einige Bemerkungen zur Entwicklung der Graptolithenfaunen in Mitteldeutschland und Bohmen. Geologie 9, 556–64.Google Scholar
Bridge, D. McC., Carney, J. N., Lawley, R. S. & Rushton, A. W. A. 1998. The geology of the country around Coventry and Nuneaton. Memoir of the British Geological Survey, Sheet 169 (England and Wales), x + 185 pp. London: The Stationery Office.Google Scholar
Bull, E. E. & Loydell, D. K. 1995. Uppermost Telychian graptolites from the North Esk Inlier, Pentland Hills, near Edinburgh. Scottish Journal of Geology 31, 163–70.CrossRefGoogle Scholar
Bulman, O. M. B. 1944–1947. A monograph of the Caradoc (Balclatchie) graptolites from limestones in Laggan Burn, Ayrshire. Monograph of the Palaeontographical Society, London (1) 1945, 1–42, pls 1–3; (2) 1946, 43–58, pls 4–6; (3) 1947, i–xi, 59–78, pls 7–10.Google Scholar
Bulman, O. M. B. 1963. On Glyptograptus dentatus (Brongniart) and some allied species. Palaeontology 6, 665–89.Google Scholar
Bulman, O. M. B. 1964. Lower Palaeozoic plankton. Quarterly Journal of the Geological Society of London 120, 455–76.CrossRefGoogle Scholar
Bulman, O. M. B. & Rushton, A. W. A. 1973. Tremadoc faunas from boreholes in Central England. Bulletin of the Geological Survey of Great Britain, no. 43, 1–40, 7 pls.Google Scholar
Cave, R. 1979. Sedimentary environments of the basinal Llandovery of mid-Wales. In Caledonides of the British Isles: Reviewed (eds Harris, A. L., Holland, C. H. & Leake, B. E.), pp. 517–26. Geological Society of London, Special Publication no. 8.Google Scholar
Cave, R. & Hains, B. A. 1986. Geology of the country between Aberystwyth and Machynlleth. Memoir of the British Geological Survey, Sheet 163 (England and Wales).Google Scholar
Cave, R. & Hains, B. A. 2001. Geology of the country around Montgomery and the Ordovician rocks of the Shelve area. Memoir for 1:50 000 Sheet 165 with part of Sheet 151 (Welshpool) (England and Wales). London: The Stationery Office.Google Scholar
Cave, R. & Rushton, A. W. A. 1996. The Llandeilo (Ordovician) Series in the core of the Twyi Anticline, Llanwrtyd, Powys, UK. Geological Journal 31, 47–60.3.0.CO;2-A>CrossRefGoogle Scholar
Chopey-Jones, A., Williams, M. & Zalasiewicz, J. A. 2003. Biostratigraphy, palaeobiogeography and morphology of the Llandovery graptolites Campograptus lobiferus (M'Coy) and Campograptus harpago (Törnquist). Scottish Journal of Geology 39, 71–85.CrossRefGoogle Scholar
Churkin, M., Carter, C. & Johnson, B. R. 1977. Subdivision of Ordovician and Silurian time scale using accumulation rate of graptolite shale. Geology 5, 452–6.2.0.CO;2>CrossRefGoogle Scholar
Cocks, L. R. M. & Toghill, P. 1973. The biostratigraphy of the Silurian rocks of the Girvan District, Scotland. Journal of the Geological Society, London 129, 209–43.CrossRefGoogle Scholar
Cocks, L. R. M., Woodcock, N. H., Rickards, R. B., Temple, J. T. & Lane, P. D. 1984. The Llandovery Series of the type area. Bulletin of the British Museum (Natural History) Geology 38, 131–82.Google Scholar
Cooper, A. H., Fortey, N. J., Hughes, R. A., Molyneux, S. G., Moore, R. M., Rushton, A. W. A. & Stone, P. 2004. Skiddaw Group of the English Lake District. Memoir of the British Geological Survey. London: The Stationery Office.Google Scholar
Cooper, A. H., Rushton, A. W. A., Molyneux, S. G., Moore, R. M. & Webb, B. C. 1995. The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District. Geological Magazine 132, 185–211.CrossRefGoogle Scholar
Cooper, R. A. 1979. Sequence and correlation of Tremadoc graptolite assemblages. Alcheringa 3, 7–19.CrossRefGoogle Scholar
Cooper, R. A. 1999. Ecostratigraphy, zonation and global correlation of earliest Ordovician planktic graptolites. Lethaia 32, 1–16.CrossRefGoogle Scholar
Cooper, R. A. & Lindholm, K. 1990. A precise worldwide correlation of early Ordovician graptolite sequences. Geological Magazine 127, 497–525.CrossRefGoogle Scholar
Cooper, R. A., Nowlan, G. S. & Williams, S. H. 2001. Global Stratotype Section and Point for the base of the Ordovician System. Episodes 24, 19–28.CrossRefGoogle Scholar
Cooper, R. A. & Sadler, P. M. 2004. The Ordovician Period. In A Geological Time Scale 2004 (eds Gradstein, F. M., Ogg, J. G. & Smith, A. G.), pp. 165–87. Cambridge University Press.Google Scholar
Cullum, A. A. & Loydell, D. K. 1996. A new species of Neodiplograptus from the Middle Llandovery of the Rheidol Gorge, Wales. Journal of the Czech Geological Society 41, 217–19.Google Scholar
Davies, J. R., Fletcher, C. J. N., Waters, R. A., Wilson, D., Woodhall, D. G. & Zalasiewicz, J. A. 1997. Geology of the country around Llanilar and Rhayader. Memoir of the British Geological Survey, Sheets 178 and 179 (England and Wales).Google Scholar
Davies, J. R., Waters, R. A., Wilby, P. R., Williams, M. & Wilson, D. 2003. Geology of the Cardigan and Dinas island district – A brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50,000 Sheet 193 (including part of Sheet 210) Cardigan and Dinas Island (England and Wales).Google Scholar
Davies, K. A. 1929. Notes on the graptolite faunas of the Upper Ordovician and Lower Silurian. Geological Magazine 66, 1–27.CrossRefGoogle Scholar
Elles, G. L. 1900. The zonal classification of the Wenlock Series of the Welsh Borderland. Quarterly Journal of the Geological Society of London 56, 370–414.CrossRefGoogle Scholar
Elles, G. L. 1925. The characteristic assemblages of the graptolite zones of the British Isles. Geological Magazine 62, 337–47.CrossRefGoogle Scholar
Elles, G. L. 1933. The Lower Ordovician graptolite faunas with special reference to the Skiddaw Slates. Summary of Progress. Geological Survey of Great Britain (for 1932), 94–111.Google Scholar
Elles, G. L. 1937. The classification of the Ordovician rocks. Geological Magazine 74, 481–95.CrossRefGoogle Scholar
Elles, G. L. 1940. The stratigraphy and faunal succession in the Ordovician rocks of the Builth–Llandrindod inlier, Radnorshire. Quarterly Journal of the Geological Society of London 95, 383–445.CrossRefGoogle Scholar
Elles, G. L. & Wood, E. M. R. 1901–1918. A monograph of British graptolites. London: The Palaeontographical Society.Google Scholar
Erdtmann, B. D. 1976. Ecostratigraphy of Ordovician graptoloids. In The Ordovician System (ed. Bassett, M. G.), pp. 621–43. Cardiff: University of Wales Press and National Museum of Wales.Google Scholar
Finney, S. C. 1986. Graptolite biofacies and the correlation of eustatic, subsidence and tectonic events in the Middle to Upper Ordovician of North America. Palaios 1, 453–61.CrossRefGoogle 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. & Rickards, R. B.), pp. 47–59. Geological Society of London, Special Publication no. 20.Google Scholar
Finney, S. C. & Berry, W. B. N. 1997. New perspectives on graptolite distribution and their use as indicators of platform margin dynamics. Geology 25, 919–22.2.3.CO;2>CrossRefGoogle Scholar
Floyd, J. D. 1999. Geology of the Carrick–Loch Doon district. British Geological Survey Memoir for 1:50 000 sheets 8W and 8E. London: The Stationery Office.Google Scholar
Floyd, J. D. & Rushton, A. W. A. 1993. Ashgill greywackes in the Southern Uplands of Scotland: an extension of the Ordovician succession in the Northern Belt. Transactions of the Royal Society of Edinburgh: Earth Sciences 84, 79–85.CrossRefGoogle Scholar
Floyd, J., Williams, M. & Rushton, A. W. A. 1999. Late Ordovician (Ashgill) ostracodes from the Drummuck Group, Craighead Inlier, Girvan District, south-west Scotland. Scottish Journal of Geology 35, 15–24.CrossRefGoogle Scholar
Fortey, R. A., Beckly, A. J. & Rushton, A. W. A. 1990. International correlation of the base of the Llanvirn Series, Ordovician System. Newsletters on Stratigraphy 22, 119–42.CrossRefGoogle Scholar
Fortey, R. A., Harper, D. A. T., Ingham, J. K., Owen, A. W., Parkes, M. A., Rushton, A. W. A. & Woodcock, N. H. 2000. A Revised Correlation of Ordovician Rocks in the British Isles. Geological Society of London, Special Report no. 24, 83 pp.CrossRefGoogle Scholar
Fortey, R. A., Harper, D. A. T., Ingham, J. K., Owen, A. W. & Rushton, A. W. A. 1995. A revision of Ordovician series and stages from the historical type area. Geological Magazine 132, 15–30.CrossRefGoogle Scholar
Fortey, R. A. & Owens, R. M. 1978. Early Ordovician 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 147, 607–10.CrossRefGoogle Scholar
Gibbons, W. & McCarroll, D. 1993. Geology of the area around Aberdaron, including Bardsey Island. Memoir of the British Geological Survey, sheet 133 (England and Wales), viii + 88 pp. London: HMSO.Google Scholar
Hall, J. 1865. Graptolites of the Quebec Group. Figures and descriptions of Canadian organic remains. Geological Survey of Canada, Dec. 2, 1–151, pls 1–21.Google Scholar
Hamilton, B. M. 2001. Charles Lapworth's “The Moffat Series”. Episodes 24, 194–200.CrossRefGoogle Scholar
Harper, D. A. T. & Williams, S. H. 2002. A relict Ordovician brachiopod fauna from the Parakidograptus acuminatus Biozone (lower Silurian) of the English Lake District. Lethaia 35, 71–8.CrossRefGoogle Scholar
Harper, J. C. 1956. The Ordovician succession near Llanystumdwy, Caernarvonshire. Liverpool and Manchester Geological Journal 1, 385–93.CrossRefGoogle Scholar
Holland, C. H., Lawson, J. D. & Walmsley, V. G. 1963. The Silurian rocks of the Ludlow District, Shropshire. Bulletin of the British Museum (Natural History) Geology 8, 95–171.Google Scholar
Holland, C. H. & Palmer, D. C. 1974. Bohemograptus, the youngest graptoloid known from the British Silurian sequence. In Graptolite studies in honour of O. M. B. Bulman (eds Rickards, R. B., Jackson, D. E. & Hughes, C. P.), pp. 215–36. Special Papers in Palaeontology 13. London: The Palaeontological Association.Google Scholar
Holland, C. H., Rickards, R. B. & Warren, P. T. 1969. The Wenlock graptolites of the Ludlow District, Shropshire, and their stratigraphical significance. Palaeontology 12, 663–83.Google Scholar
Hopkinson, J. 1873. On the occurrence of numerous species of graptolites in the Ludlow rocks of Shropshire. Geological Magazine 10, 519–20.Google Scholar
Howe, M. P. A. 1999. The Silurian fauna (graptolite and nautiloid) of the Niarbyl Formation, Isle of Man. In In sight of the suture: the Palaeozoic geology of the Isle of Man in its Iapetus Ocean context (eds Woodcock, N. H., Quirk, D. G., Fitches, W. R. & Barnes, R. P.), pp. 177–87. Geological Society of London, Special Publication no. 160.Google Scholar
Howells, M. F. & Smith, M. 1997. The Geology of the Country around Snowdon. Memoir of the British Geological Survey, Sheet 119 (England and Wales). London: The Stationery Office.Google Scholar
Hughes, R. A. 1989. Llandeilo and Caradoc graptolites of the Builth and Shelve Inliers. London: The Palaeontographical Society. Publication 577, part of vol. 141 for 1987.Google Scholar
Hughes, R. A. 1995. The durations of Silurian graptolite zones. Geological Magazine 132, 113–15.CrossRefGoogle Scholar
Hutt, J. E. 1974–1975. The Llandovery graptolites of the English Lake District. London: The Palaeontographical Society. Publ. 540, part of vol. 128 (1974), 1–56; publ. 542, part of vol. 129 (1975), 57–137.CrossRefGoogle Scholar
Hutt, J. E. & Rickards, R. B. 1970. The evolution of the earliest Llandovery monograptids. Geological Magazine 107, 67–77.CrossRefGoogle Scholar
Ingham, J. K. 1966. The Ordovician rocks in the Cautley and Dent districts of Westmoreland and Yorkshire. Proceedings of the Yorkshire Geological Society 35, 455–505.CrossRefGoogle Scholar
Ingham, J. K. 1979. The Moffat area. In Guidebook to field meeting, Great Britain, March 30–April 11, 1979 (eds Bassett, M. G., Cocks, L. R. M., Holland, C. H., Ingham, J. K., Lawson, J. D., Rickards, R. B. & Temple, J. T.), pp. 42–6. Subcommission on Silurian Stratigraphy, Ordovician–Silurian Boundary Working Group, I. U. G. S.Google Scholar
Ingham, J. K. & Wright, A. D. 1970. A revised classification of the Ashgill Series. Lethaia 3, 233–42.CrossRefGoogle Scholar
Jackson, D. E. 1962. Graptolite Zones in the Skiddaw Group in Cumberland, England. Journal of Paleontology 36, 300–13.Google Scholar
Jackson, D. E. 1978. The Skiddaw Group. In The geology of the Lake District (ed. Moseley, F.), pp. 79–98. Yorkshire Geological Society, Occasional Publication no. 3.Google Scholar
Jaeger, H. 1959. Graptolithen und Stratigraphie der jüngsten Thüringer Slurs. Abhandlungen der Deutschen Akademie der Wissenschaften zu Berlin (Berlin 1959), 1–197.Google Scholar
Jaeger, H. 1991. Neue Standard-Graptolithenzonenfolge nach der ‘Grossen Krise’ an der Wenlock/Ludlow Grenze (Silur). Neues Jahrbuch fur Geologie und Paläontologie, Abhandlungen 182, 303–54.CrossRefGoogle Scholar
Jenkins, C. J. 1982. Isograptus gibberulus (Nicholson) and the isograptids of the Arenig Series (Ordovician) of England and Wales. Proceedings of the Yorkshire Geological Society 44, 219–48.CrossRefGoogle Scholar
Jenkins, C. J. 1983. The Ordovician graptolites from the Great Paxton Borehole, Cambridgeshire. Palaeontology 26, 641–53.Google Scholar
Jenkins, C. J. 1987. The Ordovician graptolite Didymograptus murchisoni in south Wales and its use in three-dimensional absolute strain analysis. Transactions of the Royal Society of Edinburgh: Earth Sciences 78, 105–14.CrossRefGoogle Scholar
Jones, H., Zalasiewicz, J. A. & Rickards, R. B. 2002. Clingfilm preservation of spiraliform graptolites: evidence of organically sealed Silurian seafloors. Geology 30, 343–6.2.0.CO;2>CrossRefGoogle Scholar
Jones, O. T. 1909. The Hartfell–Valentian succession in the district around Plynlimon and Pont Erwyd (North Cardiganshire). Quarterly Journal of the Geological Society of London 65, 463–537.CrossRefGoogle Scholar
Jones, O. T. 1947. The geology of the Silurian rocks west and south of the Carneddau range, Radnorshire. Quarterly Journal of the Geological Society of London 103, 1–26.CrossRefGoogle Scholar
Jones, O. T. & Pugh, W. J. 1916. The geology of the district around Machynlleth and the Llyfnant Valley. Quarterly Journal of the Geological Society of London 71, 343–85.CrossRefGoogle Scholar
Jones, O. T. & Pugh, W. J. 1935. The geology of the districts around Machynlleth and Aberystwyth. Proceedings of the Geologists’ Association 46, 247–300.CrossRefGoogle Scholar
Kirk, N. H. 1978. Mode of life of graptolites. Acta Palaeontologica Polonica 23, 533–55.Google Scholar
Koren’, T. N., Lenz, A. C., Loydell, D. K., Melchin, M. J., Štorch, P. & Teller, L. 1996. Generalized graptolite zonal sequence defining Silurian time intervals for global palaeogeographic studies. Lethaia 29, 59–60.CrossRefGoogle Scholar
Landing, E., Bowring, S. A., Davidek, K. L., Rushton, A. W. A., Fortey, R. A. & Wimbledon, W. A. P. 2000. Cambro-Ordovician boundary age and duration of the lowest Ordovician Tremadoc Series based on U–Pb zircon dates from Avalonian Wales. Geological Magazine 137, 485–94.CrossRefGoogle Scholar
Lapworth, C. 1878. The Moffat Series. Quarterly Journal of the Geological Society of London 34, 240–346.CrossRefGoogle Scholar
Lapworth, C. 1879–1880a. The geological distribution of the Rhabdophora. Annals and Magazine of Natural History, London (5) 3 (1879), 245–57, 449–55; 4 (1879), 333–41, 423–21; 5 (1880), 45–62, 273–85, 358–69; 6 (1880a), 16–29, 185–207.CrossRefGoogle Scholar
Lapworth, C. 1980 b. On new British graptolites. Annals and Magazine of Natural History, London (5) 5, 149–77.CrossRefGoogle Scholar
Lapworth, H. 1900. The Silurian sequence of Rhayader. Quarterly Journal of the Geological Society of London 56, 67–137.CrossRefGoogle Scholar
Lenz, A. C., Noble, P. J., Masiak, M., Poulson, S. R. & Kozłowska, A. 2006. The lundgreni Extinction Event: integration of paleontological and geochemical data from Arctic Canada. GFF 128, 153–8.CrossRefGoogle Scholar
Lindholm, K. 1991. Ordovician graptolites from the early Hunneberg of Southern Scandinavia. Palaeontology 34, 283–327.Google Scholar
Linnarsson, J. G. O. 1871. Om några försteningar från Sveriges och Norges Primordialzon. Öfversikt af Kongliga Vetenskaps-Akademiens Förhandlingar 6, 789–97.Google Scholar
Loydell, D. K. 1990. On the type material of the Llandovery (Silurian) graptoloid Monograptus pseudobecki Bouček & Přibyl, 1942 and the species’ biostratigraphical significance. Scottish Journal of Geology 26, 119–23.CrossRefGoogle Scholar
Loydell, D. K. 1991 a. The biostratigraphy and formational relationships of the upper Aeronian and lower Telychian (Llandovery, Silurian) formations of western mid-Wales. Geological Journal 26, 209–44.CrossRefGoogle Scholar
Loydell, D. K. 1991 b. Dob's Linn – the type locality of the Telychian (Upper Llandovery) Rastrites maximus Biozone? Newsletters on Stratigraphy 25, 155–61.CrossRefGoogle Scholar
Loydell, D. K. 1992–1993a. Upper Aeronian and lower Telychian (Llandovery) graptolites from western mid-Wales. London: The Palaeontographical Society. Publ. 589 for vol. 146 (1992), 1–55; publ. 592 for vol. 147 (1993), 56–180.Google Scholar
Loydell, D. K. 1993 b. Worldwide correlation of Telychian (Upper Llandovery) strata using graptolites. In High resolution stratigraphy (eds Hailwood, A. E. & Kidd, R. B.), pp. 323–40. Geological Society of London, Special Publication no. 70.Google Scholar
Loydell, D. K. 2007. Graptolites from the Upper Ordovician and Lower Silurian of Jordan. Special Papers in Palaeontology 78, 66 pp.Google Scholar
Loydell, D. K. & Cave, R. 1993. The Telychian (Upper Llandovery) stratigraphy of Buttington Brick Pit, Wales. Newsletters on Stratigraphy 29, 91–103.CrossRefGoogle Scholar
Loydell, D. K. & Cave, R. 1996. The Llandovery–Wenlock boundary and related stratigraphy in eastern mid-Wales with special reference to the Banwy River section. Newsletters on Stratigraphy 34, 39–64.CrossRefGoogle Scholar
Loydell, D. K. & Maletz, J. 2004. The Silurian graptolite genera Streptograptus and Pseudostreptograptus. Journal of Systematic Palaeontology 2, 65–93.CrossRefGoogle Scholar
Loydell, D. K., Štorch, P. & Melchin, M. J. 1993. Taxonomy, evolution and biostratigraphical importance of the Llandovery graptolite Spirograptus. Palaeontology 36, 909–26.Google Scholar
Maletz, J. 2001. A condensed Lower to Middle Ordovician graptolite succession at Matane, Quebec, Canada. Canadian Journal of Earth Sciences 28, 1531–9.CrossRefGoogle Scholar
Maletz, J. 2004. Discussion of Stone & Rushton, 2003. Scottish Journal of Geology 40, 185–7.CrossRefGoogle 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 Tøyen Shale of Scandinavia. Geological Magazine 128, 335–43.CrossRefGoogle Scholar
Marr, J. E. 1892. On the Wenlock and Ludlow strata of the Lake District. Geological Magazine, Decade III, vol. IX, 534–41.CrossRefGoogle Scholar
Marr, J. E. 1894. Notes on the Skiddaw Slates. Geological Magazine, Decade IV, vol. I, 122–30.Google Scholar
Marr, J. E. & Nicholson, H. A. 1888. The Stockdale Shales. Quarterly Journal of the Geological Society of London 44, 654–732.CrossRefGoogle Scholar
McMillan, A. 2002. Geology of the New Galloway and Thornhill district. Memoir for 1:50 000 Geological Sheets 9W and 9E (Scotland), London: The Stationery Office.Google Scholar
Melchin, M. J. 1989. Llandovery graptolite biostratigraphy and paleobiogeography, Cape Phillips Island, Canadian Arctic Islands. Canadian Journal of Earth Sciences 26, 1726–46.CrossRefGoogle Scholar
Melchin, M. J. 2007. Biostratigraphic and palaeobiogeographic significance of some Aeronian (Lower Silurian) graptolites from the Arisaig Group, Nova Scotia, Canada. Acta Palaeontologica Sinica 46 (supp.), 311–19.Google Scholar
Melchin, M. J., Cooper, R. A. & Sadler, P. M. 2004. The Silurian Period. In A Geologic Time Scale 2004 (eds Gradstein, F. M., Ogg, J. G. & Smith, A. G.), pp. 188–201. Cambridge University Press.Google Scholar
Melchin, M. J. & DeMont, M. E. 1995. Propulsion modes in the Graptoloidea: a new model for graptolite locomotion. Paleobiology 21, 110–20.CrossRefGoogle Scholar
Mitchell, C. E. 1987. The evolution and classification of the Diplograptacea. Palaeontology 30, 353–405.Google Scholar
Mitchell, C. E., Goldman, D., Klosterman, S. L., Maletz, J., Sheets, H. D. & Melchin, M. J. 2007. Phylogeny of the Ordovician Diplograptoidea. Acta Palaeontologica Sinica 46 (supp.), 332–9.Google Scholar
Molyneux, S. G. & Rushton, A. W. A. 1988. The age of the Watch Hill Grits, English Lake District: structural and palaeogeographical implications. Transactions of the Royal Society of Edinburgh: Earth Sciences 79, 43–69.CrossRefGoogle Scholar
Mullins, G. L. & Aldridge, R. J. 2004. Chitinozoan biostratigraphy of the basal Wenlock Series (Silurian) Global Stratotype Section and Point. Palaeontology 47, 745–73.CrossRefGoogle Scholar
Nicholson, H. A. 1868. On the graptolites of the Coniston Flags. Quarterly Journal of the Geological Society of London 24, 521–45.CrossRefGoogle Scholar
Ogg, J. G., Ogg, G. & Gradstein, F. M. 2008. The concise geologic time scale. Cambridge University Press, 177 pp.Google Scholar
Old, R. A., Sumbler, M. G. & Ambrose, K. 1987. Geology of the country around Warwick. Memoir of the British Geological Survey, Sheet 184 (England & Wales), viii + 93 pp. London: HMSO.Google Scholar
Owens, R. M., Fortey, R. A., Cope, J. C. W., Rushton, A. W. A. & Bassett, M. G. 1982. Tremadoc faunas from the Carmarthen district, South Wales. Geological Magazine 119, 1–38.CrossRefGoogle Scholar
Packham, G. H. 1962. Some Diplograptids from the British Lower Silurian. Palaeontology 5, 498–526.Google Scholar
Page, A., Zalasiewicz, J. A., Williams, M. & Popov, L. E. 2007. Were transgressive black shales a negative feedback modulating glacioeustasy in the Early Palaeozoic Icehouse? In Deep-Time Perspectives on Climate Change: Marrying the Signal from Computer Models and Biological Proxies (eds Williams, M., Haywood, A. M., Gregory, F. J. & Schmidt, D. N.), pp. 123–56. The Micropalaeontological Society, Special Publications. London: The Geological Society.CrossRefGoogle Scholar
Palmer, D. & Rickards, B. (eds) 1991. Graptolites: writing in the rocks. Woodbridge, UK: The Boydell Press, 182 pp.Google Scholar
Pannell, C. L., Clarkson, E. N. K. & Zalasiewicz, J. A. 2006. Fine-scale biostratigraphy within the Stimulograptus sedgwickii Biozone (Llandovery: Silurian) at Dob's Linn, Southern Uplands. Scottish Journal of Geology 42, 59–64.CrossRefGoogle Scholar
Peach, B. N. & Horne, J. 1899. The Silurian Rocks of Britain, Vol. I. Scotland. Memoirs of the Geological Survey of the United Kingdom. H.M.S.O.Google Scholar
Porębska, E., Kozłowska-Dawidziuk, A. & Masiak, M. 2004. The lundgreni event in the Silurian of the East European Platform, Poland. Palaeogeography, Palaeoclimatology, Palaeoecology 213, 271–94.CrossRefGoogle Scholar
Pratt, W. T., Woodhall, D. G. & Howells, M. F. 1995. Geology of the country around Cadair Idris. Memoir of the British Geological Survey, Sheet 149 (England & Wales), ix + 111 pp. London: HMSO.Google Scholar
Přibyl, A. 1983. Graptolite biozones of the Kopanina and Přidoli Formations in the Upper Silurian of central Bohemia. Casopis pro Mineralogii a Geologii 28, 149–67.Google Scholar
Rickards, R. B. 1964. The graptolitic mudstones and associated facies in the Silurian strata of the Howgill Fells. Geological Magazine 10, 435–51.CrossRefGoogle Scholar
Rickards, R. B. 1965. New Silurian graptolites from the Howgill Fells, Northern England. Palaeontology 8, 247–71.Google Scholar
Rickards, R. B. 1967. The Wenlock and Ludlow succession in the Howgill Fells (north-west Yorkshire and Westmorland). Quarterly Journal of the Geological Society of London 123, 215–51.CrossRefGoogle Scholar
Rickards, R. B. 1969. Wenlock graptolite zones in the English Lake District. Proceedings of the Geological Society, London 1654, 61–5.Google Scholar
Rickards, R. B. 1970. The Llandovery (Silurian) graptolites of the Howgill Fells, Northern England. London: The Palaeontographical Society.Google Scholar
Rickards, R. B. 1976. The sequence of Silurian graptolite zones in the British Isles. Geological Journal 11, 153–88.CrossRefGoogle Scholar
Rickards, R. B. 1989. Exploitation of graptolite cladogenesis in Silurian stratigraphy. In A global standard for the Silurian System (eds Holland, C. H. & Bassett, M. G.), pp. 267–74. National Museum of Wales, Geological Series no. 9. Cardiff.Google Scholar
Rickards, R. B. 1995. Utility and precision of Silurian graptolite biozones. Lethaia 28, 129–37.CrossRefGoogle Scholar
Rickards, R. B. 2002. The graptolitic age of the type Ashgill Series (Ordovician), Cumbria, UK. Proceedings of the Yorkshire Geological Society 54, 1–16.CrossRefGoogle Scholar
Rickards, R. B. 2004. The significance of the graptoloid Amphigraptus divergens from the (mid-Rawtheyan) type section of the Ashgill Series, Ordovician. Geological Magazine 141, 735–8.CrossRefGoogle Scholar
Rickards, R. B. & Durman, P. N. 2006. Evolution of the earliest graptolites and other hemichordates. In Studies in Palaeozoic palaeontology (eds Bassett, M. G. & Deisler, V. K..), pp. 5–92. National Museum of Wales, Geological Series no. 25. Cardiff.Google Scholar
Rickards, R. B., Hutt, J. E. & Berry, W. B. N. 1977. Evolution of the Silurian and Devonian graptoloids. Bulletin of the British Museum (Natural History) Geology 28, 1–120, pls 1–6.CrossRefGoogle Scholar
Rickards, R. B., Rigby, S., Rickards, J. & Swales, C. 1998. Fluid dynamics of the graptolite rhabdosome recorded by Laser Doppler Anemometry. Palaeontology 41, 737–52.Google Scholar
Rigby, S. & Rickards, B. 1990. New evidence for the life habit of graptoloids from physical modelling. Paleobiology 15, 402–13.CrossRefGoogle Scholar
Riva, J. 1976. Climacograptus bicornis bicornis (Hall), its ancestor and likely decendents. In The Ordovician System: Proceedings of a Palaeontological Association symposium, Birmingham, September 1974 (ed. Bassett, M. G..), pp. 589–619. Cardiff: University of Wales Press.Google Scholar
Rong, Jiauyu et al. 2007. Final Report of the Subcommission on Silurian Stratigraphy Restudying the Global Stratotype for the base of the Silurian. Silurian Times 14, 10–13.Google Scholar
Rushton, A. W. A. 1981. A polymorphic graptolite from the concealed Tremadoc rocks of England. Geological Magazine 118, 615–22.CrossRefGoogle Scholar
Rushton, A. W. A. 1982. The biostratigraphy and correlation of the Merioneth–Tremadoc Series boundary in North Wales. In The Cambrian–Ordovician boundary: sections, fossil distributions and correlations (eds Bassett, M. G. & Dean, W. T.), pp. 41–59. National Museum of Wales, Geological Series no. 3. Cardiff.Google Scholar
Rushton, A. W. A. 1990. Ordovician graptolite biostratigraphy in the Welsh Basin: a review. Journal of the Geological Society, London 147, 611–14.CrossRefGoogle Scholar
Rushton, A. W. A. 1993. Graptolites from the Manx Group. Proceedings of the Yorkshire Geological Society 49, 259–62.CrossRefGoogle Scholar
Rushton, A. W. A. 2001 a. The use of graptolites in the stratigraphy of the Southern Uplands: Peach's legacy. Transactions of the Royal Society of Edinburgh: Earth Sciences 91, 341–7.CrossRefGoogle Scholar
Rushton, A. W. A. 2001 b. The graptolite fauna of the Superstes Mudstone Formation in the Ordovician of the Girvan Cover Sequence. Scottish Journal of Geology 37, 45–52.CrossRefGoogle Scholar
Rushton, A. W. A. 2003 a. A new spiny species of Pseudoclimacograptus from the Ordovician of the Sanquhar area, Southern Uplands. Scottish Journal of Geology 39, 41–4.CrossRefGoogle Scholar
Rushton, A. W. A. 2003 b. An addition to the graptolite fauna of the Superstes Mudstone Formation, Girvan district. Scottish Journal of Geology 39, 87–8.CrossRefGoogle Scholar
Rushton, A. W. A. 2006. Multum ex parvo: graptolites from Threlkeld Quarry and their implications. Proceedings of the Cumberland Geological Society 7, 146–53.Google Scholar
Rushton, A. W. A. & Molyneux, S. G. 1989. The biostratigraphic age of the Ordovician Skiddaw Group in the Black Combe inlier, English Lake District. Proceedings of the Yorkshire Geological Society 47, 267–76.CrossRefGoogle Scholar
Rushton, A. W. A., Owen, A. W., Owens, R. M. & Prigmore, J. K. 1999. British Cambrian to Ordovician Stratigraphy. Geological Conservation Review Series, no. 18. Peterborough: Joint Nature Conservation Committee, xxi + 435 pp. (published 2000).Google Scholar
Rushton, A. W. A., Stone, P. & Hughes, R. A. 1996. Biostratigraphic control of thrust models for the Southern Uplands of Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 86, 137–52.CrossRefGoogle Scholar
Rushton, A. W. A., Stone, P., Smellie, J. L. & Tunnicliff, S. P. 1986. An early Arenig age for the Pinbain sequence of the Ballantrae Complex. Scottish Journal of Geology 22, 41–54.CrossRefGoogle Scholar
Rushton, A. W. A., Tunnicliff, S. P. & Tripp, R. P. 1996. The faunas of the Albany Group in the Girvan area, and their palaeogeographical implications. Scottish Journal of Geology 32, 23–32.CrossRefGoogle Scholar
Rushton, A. W. A. & Zalasiewicz, J. A. 1999. A distinctive, stratigraphically useful normalograptid graptolite from the Caradoc of Eastern Avalonia. Irish Journal of Earth Sciences 17, 83–90.Google Scholar
Schofield, D. I., Davies, J. R., Waters, R. A., Wilby, P. R., Williams, M. & Wilson, D. 2004. Geology of the Builth Wells district – a brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 000 Sheet 196 Builth Wells (England and Wales).Google Scholar
Shergold, J. H. & Shirley, J. 1968. The faunal-stratigraphy of the Ludlovian rocks between Craven Arms and Bourton near Much Wenlock, Shropshire. Geological Journal 6, 119–38.CrossRefGoogle Scholar
Skevington, D. 1966. The morphology and systematics of ‘Didymograptus’ fasciculatus Nicholson, 1869. Geological Magazine 103, 487–97.CrossRefGoogle Scholar
Skevington, D. 1970. A Lower Llanvirn graptolite fauna from the Skiddaw Slates, Westmorland. Proceedings of the Yorkshire Geological Society 37, 395–444.CrossRefGoogle Scholar
Skevington, D. 1973. Graptolite fauna of the Great Paxton Borehole, Huntingdonshire. Bulletin of the Geological Survey of Great Britain, no. 43, 41–57, pls 8, 9.Google Scholar
Skevington, D. 1974. Controls influencing the composition and distribution of Ordovician graptolite provinces. Special Papers in Palaeontology 13, 59–73.Google Scholar
Skevington, D. & Jackson, D. E. 1976. A new Llanvirnian Isograptus from the D. murchisoni Shales of Abereiddy Bay, Wales. Alcheringa 1, 139–42.CrossRefGoogle Scholar
Stone, P. 1995. Geology of the Rhins of Galloway district. Memoir of the British Geological Survey, Sheets 1 and 3 (Scotland). London: H.M.S.O.Google Scholar
Stone, P. & Rushton, A. W. A. 1983. Graptolite faunas from the Ballantrae ophiolite complex and their structural implications. Scottish Journal of Geology 19, 297–310.CrossRefGoogle Scholar
Stone, P. & Rushton, A. W. A. 2003. A Late Arenig (early Yapeenian) graptolite fauna and the coeval tectonic development of the Ballantrae Complex ophiolite, SW Scotland. Scottish Journal of Geology 39, 29–40.CrossRefGoogle Scholar
Stone, P. & Rushton, A. W. A. 2004. Response to Maletz (2004). Scottish Journal of Geology 40, 187.CrossRefGoogle Scholar
Stone, P. & Strachan, I. 1981. A fossiliferous borehole section within the Ballantrae ophiolite. Nature 293, 455–7.CrossRefGoogle Scholar
Štorch, P. 1994. Graptolite biostratigraphy of the Lower Silurian (Llandovery and Wenlock) of Bohemia. Geological Journal 29, 137–65.CrossRefGoogle Scholar
Štorch, P. 1996. Basal Silurian Akidograptus ascensus–Parakidograptus acuminatus Biozone in the peri-Gondwanan Europe: graptolite assemblages, its stratigraphical range and paleobiogeography. Bulletin of the Czech Geological Survey 71, 171–8.Google Scholar
Štorch, P. 1998. Graptolites of the Pribylograptus leptotheca and Lituigraptus convolutus biozones of Tmaň (Silurian, Czech Republic). Journal of the Czech Geological Society 43, 209–72.Google Scholar
Štorch, P. 2001. Graptolites, stratigraphy and depositional setting of the middle Llandovery (Silurian) volcanic-carbonate facies at Hýskov (Barrandian area, Czech Republic). Bulletin of the Czech Geological Survey 76, 55–76.Google Scholar
Štorch, P. & Loydell, D. K. 1992. Graptolites of the Rastrites linnaei Group from the European Llandovery (Lower Silurian). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 184, 63–86.Google Scholar
Štorch, P. & Loydell, D. K. 1996. The Hirnantian graptolites Normalograptus persculptus and ‘Glyptograptus’ bohemicus: stratigraphical consequences of their synonomy. Palaeontology 39, 869–81.Google Scholar
Štorch, P. & Massa, D. 2006. Middle Llandovery (Aeronian) graptolites of the western Murzuq Basin and Al Qarqaf Arch region, south-west Libya. Palaeontology 49, 83–112.CrossRefGoogle Scholar
Štorch, P. & Serpagli, E. 1993. Lower Silurian graptolites from southwestern Sardinia. Bollettino della Societa Paleontologica Italiana 32, 3–57.Google Scholar
Strachan, I. 1971. A synoptic supplement to “A monograph of British Graptolites” by Miss G. L. Elles and Miss E. M. R. Wood. London: The Palaeontographical Society.CrossRefGoogle Scholar
Strachan, I. 1986. The Ordovician graptolites of the Shelve District, Shropshire. Bulletin of the British Museum (Natural History) Geology 40, 1–58.Google Scholar
Strachan, I. 1996–1997. A bibliographic index of British graptolites (Graptoloidea). Parts 1 and 2. Monograph of the Paleontographical Society London: 1–40 (Publ. No. 600, part of Vol. 150 for 1996); 41–155 (Publ. No. 603, part of Vol. 151 for 1997).CrossRefGoogle Scholar
Strahan, A., Cantrill, T. C., Dixon, E. E. L., Thomas, H. H. & Jones, O. T. 1914. The geology of the South Wales Coalfield. Part XI. The country around Haverfordwest. Memoir of the Geological Survey of England and Wales (Sheet 228), viii + 262 pp.Google Scholar
Stubblefield, C. J. & Bulman, O. M. B. 1927. The Shineton Shales of the Wrekin district: with notes on their development in other parts of Shropshire and Herefordshire. Quarterly Journal of the Geological Society of London 83, 96–146.CrossRefGoogle Scholar
Sudbury, M. 1958. Triangulate monograptids from the Monograptus gregarius Zone (lower Llandovery) of the Rheidol Gorge (Cardiganshire). Philosophical Transactions of the Royal Society of London B241, 485–555.Google Scholar
Teller, L. 1969. The Silurian biostratigraphy of Poland based on graptolites. Acta geologica Polonica 19, 393–501.Google Scholar
Toghill, P. 1968 a. The graptolite assemblages and zones of the Birkhill Shales (lower Silurian) at Dobb's Linn. Palaeontology 11, 654–68.Google Scholar
Toghill, P. 1968 b. The stratigraphical relationships of the earliest Monograptidae and the Dimorphograptidae. Geological Magazine 105, 46–51.CrossRefGoogle Scholar
Toghill, P. 1970 a. A fauna from the Hendre Shales (Llandeilo) of the Mydrim area, Carmarthenshire. Proceedings of the Geological Society, London 1663, 121–9.Google Scholar
Toghill, P. 1970 b. Highest Ordovician (Hartfell Shales) graptolite faunas from the Moffat area, south Scotland. Bulletin of the British Museum (Natural History) Geology 19, 1–26, pls 1–16.Google Scholar
Urbanek, A. 1966. On the morphology and evolution of Cucullograptus (Monograptidae, Graptolithina). Acta geologica Polonica 11, 291–544.Google Scholar
VandenBerg, A. H. M. & Cooper, R. A. 1992. The Ordovician graptolite sequence of Australasia. Alcheringa 16, 33–85.CrossRefGoogle Scholar
Wadge, A. J., Nutt, M. J. C. & Skevington, D. 1972. Geology of the Tarn Moor Tunnel in the Lake District. Bulletin of the Geological Survey of Great Britain 41, 55–73.Google Scholar
Warren, P. T. 1971. The sequence and correlation of graptolite faunas from the Wenlock–Ludlow rocks of north Wales. Bureau Récherches Geologiques et Minieres Memoire 73, 451–60.Google Scholar
Warren, P. T., Price, D., Nutt, M. J. C. & Smith, E. G. 1984. Geology of the country around Rhyl and Denbigh. Memoir of the British Geological Survey, Sheets 90 and 97 and parts of 94 and 106, 217 pp.Google Scholar
White, D. E., Barron, H. F., Barnes, R. P. & Lintern, B. C. 1992. Biostratigraphy of late Llandovery (Telychian) and Wenlock turbiditic sequences in the SW Southern Uplands, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 82, 297–322.CrossRefGoogle Scholar
Williams, M., Davies, J. R., Waters, R. A., Rushton, A. W. A. & Wilby, P. R. 2003 a. Stratigraphical and palaeoecological importance of Caradoc (Upper Ordovician) graptolites from the Cardigan area, SW Wales. Geological Magazine 140, 549–71.CrossRefGoogle Scholar
Williams, M., Rushton, A. W. A., Wood, B., Floyd, J. D., Smith, R. & Wheatley, C. 2004. A revised graptolite biostratigraphy for the lower Caradoc (Upper Ordovician) of southern Scotland. Scottish Journal of Geology 40, 97–114.CrossRefGoogle Scholar
Williams, M. & Zalasiewicz, J. A. 2004. The Wenlock Cyrtograptus species of the Builth Wells district, central Wales. Palaeontology 47, 223–63.CrossRefGoogle Scholar
Williams, M., Zalasiewicz, J. A., Rushton, A. W. A., Loydell, D. K. & Barnes, R. P. 2003 b. A new, stratigraphically significant Torquigraptus species (graptolite) from the Central Belt of the Southern Uplands Terrane, Scotland. Scottish Journal of Geology 39, 17–28.CrossRefGoogle Scholar
Williams, S. H. 1982 a. Upper Ordovician graptolites from the top Lower Hartfell Shale Formation (D. clingani and P. linearis zones) near Moffat, southern Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 72, 229–55.CrossRefGoogle Scholar
Williams, S. H. 1982 b. The late Ordovician graptolite fauna of the Anceps Bands at Dob's Linn, southern Scotland. Geologica et Palaeontologica 16, 29–56.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. 1986. Top Ordovician and lowest Silurian of Dob's Linn. In Palaeoecology and biostratigraphy of graptolites (eds Hughes, C. P. & Rickards, R. B..), pp. 165–71. Geological Society of London, Special Publication no. 20.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.CrossRefGoogle Scholar
Williams, S. H. 1988. Dob's Linn – the Ordovician–Silurian boundary stratotype. Bulletin of the British Museum of Natural History (Geology) 43, 17–30.Google Scholar
Williams, S. H. 1994. Revision and definition of the C. wilsoni graptolite Zone (middle Ordovician) of southern Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 85, 143–57.CrossRefGoogle Scholar
Williams, S. H. & Stevens, R. K. 1988. Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland. Palaeontographica Canadiana 5, 1–167.Google Scholar
Wood, E. M. R. 1900. The Lower Ludlow Formation and its graptolite-fauna. Quarterly Journal of the Geological Society of London 56, 415–92.CrossRefGoogle Scholar
Wood, E. M. R. 1906. The Tarannon Series of Tarannon. Quarterly Journal of the Geological Society of London 62, 644–701.CrossRefGoogle Scholar
Young, T., Gibbons, W. & McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, sheet 134 (England and Wales) x + 151 pp. London: The Stationery Office.Google Scholar
Zalasiewicz, J. A. 1984. A re-examination of the type Arenig Series. Geological Journal 19, 105–24.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1986. Graptolites from the type Arenig Series. Geological Magazine 123, 537–44.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1990. Silurian graptolite biostratigraphy in the Welsh Basin. Journal of the Geological Society, London 147, 619–22.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1992 a. Graptolite dating of Ordovician vulcanicity in the Arenig area, North Wales. Geological Journal 27, 379–89.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1992 b. Two new graptolites from the early Silurian (Llandovery: Aeronian) of central Wales: an origin for monoclimacid thecal morphology. Geological Magazine 126, 779–85.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1994. Middle to late Telychian (Silurian: Llandovery) graptolite assemblages of central Wales. Palaeontology 37, 375–96.Google Scholar
Zalasiewicz, J. A. 1995. The structure and affinities of Lapworthograptus grayae (Lapworth, 1876). Scottish Journal of Geology 31, 29–36.CrossRefGoogle Scholar
Zalasiewicz, J. A. 1996. Aeronian (Silurian: Landovery) graptolites from central Wales. Geologica et Palaeontologica 30, 1–14.Google Scholar
Zalasiewicz, J. A. 2001. Graptolites as constraints on models of sedimentation across Iapetus: a review. Proceedings of the Geologists’ Association 112, 237–51.CrossRefGoogle Scholar
Zalasiewicz, J. A. & Howe, M. P. A. 2003. A case of profound astogenetic metamorphosis: the structure and affinities of Awarograptus nodifer (Törnquist, 1881). Scottish Journal of Geology 39, 45–9.CrossRefGoogle Scholar
Zalasiewicz, J. A., Loydell, D. K. & Štorch, P. 1995. A taxonomic revision of three mid-Telychian monoclimacids. Journal of Paleontology 69, 961–967.CrossRefGoogle Scholar
Zalasiewicz, J. A. & Rushton, A. W. A. 2008. Atlas of Graptolite Type Specimens, Folio 2. London: Palaeontographical Society.Google Scholar
Zalasiewicz, J. A., Rushton, A. W. A., Hutt, J. E. & Howe, M. P. A. 2000. Atlas of Graptolite Type Specimens, Folio 1. London: Palaeontographical Society.Google Scholar
Zalasiewicz, J. A., Rushton, A. W. A. & Owen, A. W. 1995. Late Caradoc graptolitic faunal gradients across the Iapetus Ocean. Geological Magazine 132, 611–17.CrossRefGoogle Scholar
Zalasiewicz, J. A. & Tunnicliff, S. P. 1994. Uppermost Ordovician to Lower Silurian graptolite biostratigraphy of the Wye Valley, Central Wales. Palaeontology 37, 695–720.Google Scholar
Zalasiewicz, J. A. & Williams, M. 1999. Graptolite biozonation of the Wenlock (Silurian) rocks of the Builth Wells district, central Wales. Geological Magazine 136, 263–83.CrossRefGoogle Scholar
Zalasiewicz, J. A., Williams, M. & Akhurst, M. 2003. An unlikely evolutionary lineage: the Rhuddanian (Silurian, Llandovery) graptolites Huttagraptus? praematurus and Coronograptus cyphus re-examined. Scottish Journal of Geology 39, 89–96.CrossRefGoogle Scholar