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Palaeoenvironments and palynofacies of a pulsed transgression: the late Devonian and early Dinantian (Lower Carboniferous) rocks of southeast Wales

Published online by Cambridge University Press:  01 May 2009

J. R. Davies ,
A. McNestry  and
R. A. Waters
J. R. Davies
Affiliation:
British Geological Survey, Bryn Eithyn Hall, Llanfarian, Aberystwyth, Dyfed SY23 4BY, U.K.
A. McNestry
Affiliation:
British Geological Survey, Keyworth, Nottingham NG12 5GG, U.K.
R. A. Waters
Affiliation:
British Geological Survey, Bryn Eithyn Hall, Llanfarian, Aberystwyth, Dyfed SY23 4BY, U.K.
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Abstract

Two boreholes in the Vale of Glamorgan have provided new data on the nature of the early Dinantian (Courceyan) transgression in South Wales. This transgression is manifested by the transition from the largely fluviatile, late Devonian, Upper Old Red Sandstone (Quartz Conglomerate Group) to the predominantly marine, early Dinantian, Lower Limestone Shale Group. The marine sequence comprises five shoaling upwards cycles, constructed from a suite of sedimentary lithofacies which record deposition in environments ranging from coastal plain, peritidal, lagoon, barrier and embayment to subtidal, open marine shelf. Each cycle represents a pulse of the transgression, and each successive pulse appears to have been larger than the preceding one, introducing progressively less restricted and more distal marine environments.

Thirty-seven samples were processed for palynological analysis. Miospore biozonation supports the cycle correlations between the two boreholes, suggested by the sedimentary event stratigraphy. Detrital kerogens from the samples comprise both terrestrially derived and marine types in varying proportions. Each kerogen type is described as well as the size, sorting and preservation of each assemblage. A palynofacies profile is presented for eachof the depositional environments recognized.

Type
Articles
Information
Geological Magazine , Volume 128 , Issue 4 , July 1991 , pp. 355 - 380
Copyright
Copyright © Cambridge University Press 1991

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References

Allen, J. R. L. 1965. Upper Old Red Sandstone (Farlovian) palaeogeography in South Wales and the Welsh Borderland. Journal of Sedimentary Petrology 35, 167–95.Google Scholar
Andrews, P. B. 1970. Fades and Genesis of a Hurricane-Washover Fan, St. Joseph Island, Central Texas Coast. Bureau of Economic Geology, Report of Investigations no. 67, Austin, Texas.CrossRefGoogle Scholar
Barclay, W. J. 1989. Geology of the South Wales Coalfield. Part II. The Country around Abergavenny, 3rd ed. Memoir of the British Geological Society, Sheet 232 (England and Wales).Google Scholar
Batten, D. J. 1969. Some British Wealden megaspores and their facies distribution. Palaeontology 12, 330–50.Google Scholar
Batten, D. J. 1974. Wealden palaeoecology from the distribution of plant fossils. Proceedings of the Geologists' Association 85, 433–58.CrossRefGoogle Scholar
Blackburn, K. B. & Temperley, B. N. 1935–1936. Botryococcus and the algal coals. 1 and 2. Transactions of the Royal Society of Edinburgh 58, no. 29, 841–67.Google Scholar
Boulter, M. C. & Riddick, A. 1986. Classification and analysis of palynodebris from the Palaeocene sediments of the Forties Field. Sedimentology 33, 871–86.CrossRefGoogle Scholar
Bridges, P. H. 1976. Lower Silurian transgressive barrier islands, southwest Wales. Sedimentology 23, 347–62.CrossRefGoogle Scholar
Brooks, J. 1981. Organic maturation of sedimentary organic matter and petroleum exploration: a review. In Organic Maturation Studies and Fossil Fuel Exploration (ed. Brooks, J.), pp. 1–37. London: Academic Press.Google Scholar
Bujak, J. P., Barss, M. S. & Williams, G. L. 1977. Offshore East Canada's organic type and colour and hydrocarbon potential. Oil and Gas Journal,75, Part I, 198–202, and Part II, 96–9.Google Scholar
Burchette, T. P. 1987. Carbonate-barrier shorelines during the basal Carboniferous transgression: the Lower Limestone Shale Group, South Wales and Western England. In European Dinantian Environments (eds Miller, J., Adams, A. E. & Wright, V. P.), pp. 239–63. Geological Journal Special Issues No. 12.Google Scholar
Burchette, T. P., Wright, V. P. & Faulkner, T. J. 1990. Oolitic sandbody depositional models and geometries, Mississippian of southwest Britain: implications for petroleum exploration in carbonate ramp settings. Sedimentary Geology 68, 87–115.CrossRefGoogle Scholar
Coleman, U. & Clayton, G. 1987. Palynostratigraphy and palynofacies of the uppermost Devonian and lower Mississippian of Eastern Kentucky (USA), and correlation with Western Europe. Courier Forschungs-institut Senckenberg 98, 75–93.Google Scholar
Combaz, A. 1964. Les Palynofacies. Revue de Micropaléontology 7, 205–18.Google Scholar
Combaz, A., Lang, F. W. & Pansart, J. 1967. Les ‘Leiofusidae’ Eisensack 1938. Review of Palaeobotany and Palynology 1, 291–307.CrossRefGoogle Scholar
Cope, M. J. 1981. Products of natural burning as a component of the dispersed organic matter of sedimentary rocks. In Organic Maturation Studies and Fossil Fuel Exploration (ed, Brooks, J.), pp. 89–109. London: Academic Press.Google Scholar
Cramer, F. H. 1966. Palynomorphs from the Siluro–Devonian boundary in NW Spain. Notas y Comunicaciones del Instituto Geológico y Minero de España 85, 71–82.Google Scholar
Curray, J. R., Emmel, F.J. & Crampton, P. J. S. 1969. Holocene history of a strand plain, coastal lagoon, Nayarit, Mexico. In Coastal Lagoons — a Symposium (eds Castanares, A. A. and Phleger, F. B.), pp, 63–100. Mexico: Universidad Nacional Autonoma.Google Scholar
Deflandre, G. 1937. Microfossils de Silex Crétaces. Deuxième partie. Flagelles incertae sedis Hystricho-sphaerides Sarcodines. Organismes divers. Annales de Paléontologie 26, 51–103.Google Scholar
Deflandre, G. 1954. Systématiques des Hystricho-sphaerides: sur l'acceptance de genre Cymatiosphaera O. Wetzel. Compte rendu de la Société Géologique de France 12, 257–9.Google Scholar
Demaison, G. J. & Moore, G. T. 1980. Anoxic environments and oil source bed genesis. Bulletin of the American Association of Petroleum Geologists 64, 1179–209.Google Scholar
Dorning, K.J. 1981. Dinantian acritarchs from the S.W. Province of the British Isles (abstract). Palynology 5, 235.Google Scholar
Dorning, K. J. 1987. The organic palaeontology of Palaeozoic carbonate environments. In Micropalaeontology of Carbonate Environments (ed. Hart, M. B.), pp. 256–65. Chichester: Ellis Horwood.Google Scholar
Downie, C. 1958. Microplankton from the Shineton Shale (Tremadocian). Proceedings of the Yorkshire Geological Society 31, 331–49.CrossRefGoogle Scholar
Downie, D. & Sarjeant, W. A. S. 1963. On the interpretation and status of some hystrichosphere genera. Palaeontology 6, 83–96.Google Scholar
Faulkner, T. J. 1988. The Shipway Limestone of Gower: sedimentation on a storm-dominated early Carboniferous ramp. Geological Journal 23, 85–100.CrossRefGoogle Scholar
Gayer, R. A., Allen, K. C, Bassett, M. G. & Edwards, D. 1973. The structure of the Taff Gorge area, Glamorgan, and the stratigraphy of the Old Red Sandstone–Carboniferous Limestone transition. Geological Journal 8, 345–74.CrossRefGoogle Scholar
George, T. N. 1958. Lower Carboniferous palaeogeography of the British Isles. Proceedings of the Yorkshire Geological Society 31, 227–318.CrossRefGoogle Scholar
George, T. N. 1974. Lower Carboniferous rocks in Wales. In The Upper Palaeozoic and Post-Palaeozoic Rocks in Wales (ed. Owen, T. R.), pp. 85–115. Cardiff: University of Wales Press.Google Scholar
Goldring, R. & Bridges, P. 1973. Sublittoral sheet sandstones. Journal of Sedimentary Petrology 43, 736–47.Google Scholar
Gray, J. & Boucot, A.J. 1972. Palynological evidence bearing on the Ordovician–Silurian paraconformity in Ohio. Bulletin of the Geological Society of America 83, 1299–1314.CrossRefGoogle Scholar
Hart, G. F. 1986. Origin and classification of organic matter in clastic systems. Palynology 10, 1–23.CrossRefGoogle Scholar
Higgs, K., Clayton, C. & Keegan, J. 1988. Stratigraphic and Systematic Palynology of the Tournaisian Rocks of Ireland. Geological Survey of Ireland, Special Paper No. 7, 92 pp.Google Scholar
Hird, K. & Tucker, M. E. 1988. Contrasting diagenesis of two Carboniferous oolites from South Wales: a tale of climatic influence. Sedimentology 35, 587–602.CrossRefGoogle Scholar
Jacobson, S. R. 1979. Acritarchs as paleoenvironmental indicators in middle and upper Ordovician rocks from Kentucky, Ohio and New York. Journal of Paleontology 53, 1197–212.Google Scholar
Jardine, S., Combaz, A., Magloire, L., Peniguel, G. & Vachey, G. 1972. Acritarches du Silurien terminal au Dévonien du Sahara Algérian. Compte rendu du 7me Congrès International de Stratigraphie et de Géologie du Carbonifère (Krefeld, 1971) 1, 295–311.Google Scholar
Jux, U. 1984. Observations on Upper Devonian acritarch communities from the southern Bergisches Land (Rhenish Massive). Journal of Micropalaeontology 3, 35–40.CrossRefGoogle Scholar
Kutzing, F. T. 1849. Species Algarum. Lipsiae. 922 pp.Google Scholar
Loeblich, A. R. 1970. Morphology, ultrastructure and distribution of Palaeozoic acritarchs. Proceedings of the North American Paleontological Convention (Chicago) G, 705–88.Google Scholar
Loeblich, A. R. & Wicander, E. R. 1976. Organic-walled microplankton from the Lower Devonian (late Gedinnian) Haragan and Bois d' Arc Formations of Oklahoma, U.S.A. Part 1. Palaeontographica, Abteilung B 159, 1–39.Google Scholar
McNestry, A. 1988. The palynostratigraphy of two uppermost Devonian–Lower Carboniferous borehole sections in South Wales. Review of Palaeobotany and Palynology 56, 69–87.CrossRefGoogle Scholar
Masran, Th. C. & Pocock, S. A. J. 1981. The classification of plant-derived particulate organic matter in sedimentary rocks. In Organic Maturation Studies and Fossil Fuel Exploration (ed. Brooks, J.), pp. 145–75. London: Academic Press.Google Scholar
Naumova, S. N. 1953. Spore-pollen complexes of the Upper Devonian of the Russian platform and their stratigraphic significance. Trudy Instituta Geologicheskikh Nauk Akademiva Nauk SSSR 143 (Geol. Ser. 60), 204 pp.Google Scholar
Newton, E. T. 1875. Tasmanite and Australian white coal. Geological Magazine 2, 337–42.CrossRefGoogle Scholar
Playford, G. 1977. Lower to Middle Devonian Acritarchs of the Moose River Basin, Ontario. Bulletin of the Geological Survey of Canada no. 279, 87 pp.CrossRefGoogle Scholar
Pocock, S. A. J. 1982. Identification and recording of particulate sedimentary organic matter. In How to Assess Maturation and Palaeotemperatures, pp. 13–132. Society of Economic Palaeontologists and Mineralogists Short Course no. 7.CrossRefGoogle Scholar
Ramsbottom, W. H. C. 1973. Transgressions and regressions in the Dinantian: a new synthesis of British Dinantian stratigraphy. Proceedings of the Yorkshire Geological Society 39, 567–607.CrossRefGoogle Scholar
Rauscher, R. 1969. Présence d'une forme nouvelle d' Acritarches dans le Dévonien de Normandie. Compte rendu Hebdomadaire des Séances de l' Académie des Sciences 268, 34–6.Google Scholar
Riding, J. B. 1983. The palynology of the Aalenian (middle Jurassic) sediments of the Jackdaw Quarry, Gloucestershire, England. Mercian Geologist 9, 111–20.Google Scholar
Shinn, E. A. 1983. Tidal flat environment. In Carbonate Depositional Environments (eds Scholle, P. H., Bebout, D. G. & Moore, C. H.), pp. 171–210. American Association of Petroleum Geologists Memoir 33.Google Scholar
Smith, N. D. & Saunders, R. S. 1970. Paleoenvironments and their control of acritarch distribution: Silurian of east-central Pennsylvania. Journal of Sedimentary Petrology 40, 324–33.Google Scholar
Stamp, L. D. 1922. An outline of the Tertiary geology of Burma. Geological Magazine 59, 581–601.CrossRefGoogle Scholar
Staplin, F. L. 1961. Reef controlled distribution of Devonian microplankton in Alberta. Palaeontology 4, 392–424.Google Scholar
Staplin, F. L. 1969. Sedimentary organic matter, organic metamorphism and oil and gas occurrence. Bulletin of Canadian Petroleum Geology 17, 47–66.Google Scholar
Staplin, F. L., Jansonius, J. & Pocock, S. A. J. 1965. Evaluation of some acritarchous hystrichosphere genera. Neues Jahrbuch für Geologie und Palaeontologie Abhandlungen 123, 167–201.Google Scholar
Swift, D. J. P. 1968. Coastal erosion and transgressive stratigraphy. Journal of Geology 76, 444–56.CrossRefGoogle Scholar
Tappan, H. 1980. The Paleobiology of Plant Protists. San Francisco: W. H. Freeman, 1028 pp.Google Scholar
Tissot, B. P. & Welte, D. H. 1984. Petroleum Formation and Occurrence, 2nd ed. Berlin: Springer Verlag, 699 pp.CrossRefGoogle Scholar
Traverse, A. 1988. Paleopalynology. London: Allen & Unwin, 600 pp.Google Scholar
Wall, D. 1965. Microplankton, pollen and spores from the lower Jurassic in Britain. Micropaleontology 11, 151–90.CrossRefGoogle Scholar
Waters, R. A. 1978. Cwrt-yr-ala Borehole. In IGS Boreholes 1977. Report of the Institute of Geological Sciences, No. 78/21, 9.Google Scholar
Waters, R. A. & Lawrence, D. J. D. 1987. The Geology of the South Wales Coalfield. Part III. The Country around Cardiff, 3rd ed. Memoir of the British Geological Survey, Sheet 263 (England and Wales).Google Scholar
Wicander, E. R. 1974. Upper Devonian–Lower Mississippian acritarchs and prasinophycean algae from Ohio, U.S.A. Palaeontographica, Abteilung B 148, 9–43.Google Scholar
Wicander, E. R. 1975. Fluctuations in a late-Devonian–Lower Mississippian phytoplankton flora of Ohio, U.S.A. Palaeogeography, Palaeoclimatology and Palaeoecology 17, 89–108.CrossRefGoogle Scholar
Wilson, D. & Davies, J. R. 1988. Ewenny Borehole. In BGS Boreholes 1984–1986. Report of the British Geological Survey, 19, No. 1, 7.Google Scholar
Wilson, D., Davies, J. R., Fletcher, C. J. N. & Smith, M. 1990. Geology of the South Wales Coalfield. Part IV. The Country around Bridgend. Memoir of the British Geological Survey, Sheet 262 (England and Wales).Google Scholar
Wilson, D., Davies, J. R., Smith, M. & Waters, R. A. 1988. Structural controls on Upper Palaeozoic sedimentation in south-east Wales. Journal of the Geological Society, London 145, 901–14.CrossRefGoogle Scholar