Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-24T09:28:12.441Z Has data issue: false hasContentIssue false
  • English
  • Français

The Pleistocene Drift Succession at Porth-Clais, Pembrokeshire

Published online by Cambridge University Press:  01 May 2009

Brian S. John
Brian S. John
Affiliation:
Department of Geography, Science Laboratories, University of Durham
Get access Rights & Permissions [Opens in a new window]

Summary

The paper represents a reassessment of the drift stratigraphy at Porth-clais. The characteristics of the various Pleistocene deposits at the site are analysed in detail, and the sequence of drifts is then examined in its regional context. While the age of the raised beach at Porth-clais is still open to doubt, it seems that the non-calcareous till was deposited during a Late Weichselian glaciation by the Irish Sea glacier. This glacier probably extended much further south in St. George's Channel than suggested by other workers, although the ice stream which crossed St. David's Peninsula may not have been very thick.

Type
Articles
Information
Geological Magazine , Volume 107 , Issue 5 , September 1970 , pp. 439 - 457
Copyright
Copyright © Cambridge University Press 1970

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bird, E.C.F. 1969. Coasts. Massachusetts Institute of Technology Press, (Chapter 3).Google Scholar
Boulton, G.S. 1968. Flow tills and related deposits on some Vestspitsbergen glaciers. J. Glaciol. 7 391–412.CrossRefGoogle Scholar
Bowen, D.Q. 1966. Dating Pleistocene events in South-west Wales. Nature, Lond. 211, 475–476.CrossRefGoogle Scholar
Cailleux, A. 1945. Distinction des galets marins et fluviatiles. Bull. Soc. géol. Fr. 5, 375–404.CrossRefGoogle Scholar
Charlesworth, J.K. 1929. The South Wales End-moraine, Q. Jl geol. Soc. Lond. 85, 335–358.CrossRefGoogle Scholar
Cox, A.H. et al. 1930a. The Geology of the St David's District, Pembrokeshire. Proc. Geol. Ass. 41, 241–273.CrossRefGoogle Scholar
Cox, A.H. et al. 1930b. The St David's District: report of the summer meeting 1930. Proc. Geol. Ass. 41, 412–438.CrossRefGoogle Scholar
Czudek, T. 1964. Periglacial slope movement in the area of the Bohemian massif in Northern Moravia. Biul. Peryglac. 14, 169–193.Google Scholar
Dionne, J-C. 1968. Morphologie et sédimentologie glacielles, littoral sud du Saint-Laurent. Zeit. für Geomorph. Suppl. 7, 56–84.Google Scholar
Donn, W.L. Farrand, W.R. & Ewing M. 1962. Pleistocene ice volumes and sea level lowering. J. Geol. 70, 206–14.CrossRefGoogle Scholar
Dreimanis, A. & Reavely, G.A. 1953. Differentiation of the lower and upper till along the northern shore of Lake Erie. J. sedim. Petrol. 23, 238–259.Google Scholar
Embleton, C. & King, C.A.M. 1968.Glacial and Periglacial Geomorphology. Arnold. (Chapter 17).Google Scholar
George, T.N. 1933. The Glacial deposits of Gower. Geol. Mag. 70, 208–232.CrossRefGoogle Scholar
Griffiths, J.C. 1939. The mineralogy of the glacial deposits of the region between the Rivers Neath and Towy, South Wales. Proc. Geol. Ass. 50, 433–402.CrossRefGoogle Scholar
Hicks, H. 1885. In Bonney, T.G.: On the so-called diorite of Little Knott (Cumberland), with further remarks on the occurrence of picrites in Wales. Q. Jl geol. Soc. Lond. 41, 511–522.Google Scholar
Holmes, C.D. 1941. Till fabric. Bull. geol. Soc. Am. 52, 1299–1354.CrossRefGoogle Scholar
Jehu, T.J. 1904. The glacial deposits of northern Pembrokeshire. Trans. R. Soc. Edin. 41, 53–87.CrossRefGoogle Scholar
John, B.S. 1964. A description and explanation of glacial till in 1603–George Owen (1552–1613). J. Glaciol. 5, 369–370.CrossRefGoogle Scholar
John, B.S. 1965. A possible Main Würm glaciation in West Pembrokeshire. Nature, Lond. 207, 622–623.CrossRefGoogle Scholar
John, B.S. 1968. Age of raised beach deposits of South-western Britain. Nature, Lond. 218, 665–667.CrossRefGoogle Scholar
Karlstrom, T.N.V. 1952. Improved equipment and techniques for orientation studies of large particles in sediments. J. Geol. 60, 489–493.CrossRefGoogle Scholar
Kerney, M.P. 1963. Late-glacial deposits on the Chalk of South-East England. Phil. Trans. R. Soc. B, 246, 203–254.Google Scholar
Kidson, C. 1969. The role of the sea in the evolution of the British landscape. In Bowen, E.G. et al. (Eds.): Geography at Aberystwyth. University of Wales Press. (Chapter 1).Google Scholar
Krumbein, W.C. & Pettijohn, F.J. 1938. Manual of Sedimentary Petrography. New York.Google Scholar
Leach, A.L. 1911. On the relation of the Glacial Drift to the Raised Beach near Porth Clais, St Davids. Geol. Mag. 8, 462–466.CrossRefGoogle Scholar
McCann, S.B. 1964. Raised beaches of North-east Islay and Western Jura, Argyll. Trans. Inst. Brit. Geogr. 35, 1–16.Google Scholar
Mitchell, G.F. 1962. Summer field meeting in Wales and Ireland. Proc. Geol. Ass. 73, 197–213.CrossRefGoogle Scholar
Norris, G. 1962. Some glacial deposits and their relation to the Hippopotamus-bearing beds at Harrington, Cambridgeshire. Geol. Mag. 99, 97–118.CrossRefGoogle Scholar
Penny, L.F. & Catt, J.A. 1967. Stone orientation and other structural features of tills in East Yorkshire. Geol. Mag. 104, 344–360.CrossRefGoogle Scholar
Prestwich, J. 1892. The raised beaches and “head” or rubble-drift of the South of England. Q. Jl geol. Soc. Lond. 48, 263–343.CrossRefGoogle Scholar
Pringle, J. & George, T.N. 1948. South Wales (2nd edition). British Regional Geology. London, H.M.S.O. (Chapter 10).Google Scholar
Reichelt, G. 1961. Über Schotterformen und Rundungsgradanalyse als Feldmethode. Pet. Geog. Mitt. 105, 15–24.Google Scholar
Russell, R.J. 1964. Techniques of eustasy studies. Zeit. für Geomorph. 8 (Mortensen Sonderheft), 25–42.CrossRefGoogle Scholar
Saunders, G. 1968a. A fabric analysis of the ground moraine deposits of the Lleyn Peninsula of South-west Caernarvonshire. Geol. J. 6, 105–118.CrossRefGoogle Scholar
Saunders, G. 1968b. Glaciation of possible Scottish Readvance age in North-west Wales. Nature, Lond. 218, 76–78.CrossRefGoogle Scholar
Simpson, I.M. 1960. Stone-counts in the Pleistocene of the Manchester area. Proc. Yorks. geol. Soc. 32, 379–388.CrossRefGoogle Scholar
Stephens, N. & Synge, F.M. 1966. Pleistocene Shorelines. In Dury, G.H. (Ed.): Essays in Geomorphology, Heinemann. (Chapter 1).Google Scholar
Synge, F.M. 1963 A correlation between the drifts of South-east Ireland and those of Wales. Irish Geog. 4, 360–366.CrossRefGoogle Scholar
Tricart, J. 1959. L'étude comparée de la composition des alluvions fluviatiles et de la nature lithologique du bassin, moyon d'analyse des systèmes d'érosion. Rev. Geomorph. Dyn. 10, 2–15.Google Scholar
Tricart, J. & Schaeffer, R. 1950. L'indice d'érosion. Rev. Geomorph. Dyn. 1 151–179.Google Scholar
Wadell, H. 1932. Volume, shape and roundness of rock particles. J. Geol. 40, 443–451.CrossRefGoogle Scholar
Watson, E. & Watson, S. 1967. The periglacial origin of the drifts at Morfa-Bychan, near Aberystwyth. Geol. J. 5, 419–440.Google Scholar
West, R.G. 1968. Pleistocene Geology and Biology. Longmans. (Chapter 12).Google Scholar
Wirtz, D. 1953. Zur Stratigraphie des Pleistozäns in Westen der Britischen Inseln. Neues Jb. Geol. Paläont. 96, 267–303.Google Scholar
Wright, H.E. 1957. Stone orientation in the Wadena Drumlin Field, Minnesota. Geogr. Annlr 39, 19–31.Google Scholar
Wright, W.B. & Muff, H.B. 1904. The pre-glacial raised beach of the south coast of Ireland. Sci. Proc. R. Dubl. Soc. 10, 250–324.Google Scholar
Zeuner, F.E. 1959. The Pleistocene Period (2nd edition). Hutchinson. (Chapter 4).Google Scholar