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The Middle Devonian Marine Transgression in North Devon and West Somerset

Published online by Cambridge University Press:  01 May 2009

B. D. Webby
B. D. Webby
Affiliation:
Department of Geology and Geophysics, The University of Sydney, Sydney, N.S.W., Australia.
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Abstract

The lithological and faunal changes through the transition from non-marine Hangman Grits to marine Ilfracombe Beds of North Devon and West Somerset suggest the presence of a major depositional marine transgression. A fauna of thick-shelled lamellibranchs and gastropods occurs in beds lying stratigraphically between the flu-viatile Hangman deposits below, and the shallow-water marine Ilfracombe Beds above, and is considered to indicate an intermediate phase of intertidal depositional conditions. The transgression appears to have advanced across the region in a north-north-easterly direction during Lower-Middle Givetian times following coastal subsidence and possibly an associated rise of sea level.

Type
Articles
Information
Geological Magazine , Volume 102 , Issue 6 , December 1965 , pp. 478 - 488
Copyright
Copyright © Cambridge University Press 1965

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References

Allen, J. R. L., 1962. Petrology, origin and deposition of the highest Lower Old Red Sandstone of Shropshire, England. J. sediment. Petrol., 32, 657–697.Google Scholar
Allen, J. R. L., 1964. Pre-Pickwell Down Age of the Plateau Beds (Upper Devonian) in South Wales. Nature, 204, 364–6.Google Scholar
Allen, J. R. L., 1965 a. Upper Old Red Sandstone (Farlovian) palaeogeography in South Wales and the Welsh Borderland. J. sediment. Petrol., 35, 167–195.Google Scholar
Allen, J. R. L., 1965 b. Late Quaternary Niger Delta, and adjacent Areas: Sedimentary Environments and Lithofacies. Bull. Amer. Ass. Petrol. Geol., 49, 547–600.Google Scholar
Dakin, W. J., 1960. Australian Seashores. 2nd edit. Sydney.Google Scholar
Dineley, D. L., 1961. The Devonian System in South Devonshire. Field Studies 1, 121–140.Google Scholar
Evans, G., 1965. Intertidal flat sediments and their environments of deposition in the Wash. Quart. J. geol. Soc. Lond., 121, 209–245.CrossRefGoogle Scholar
Evans, J. W., 1922. The Geological Structure of the country around Combe Martin, North Devon. Proc. Geol. Ass., Lond., 33, 201–228.CrossRefGoogle Scholar
Evans, J. W., and Stubblefield, C. J. (Editors), 1929. Handbook of the Geology of Great Britain, xii + 566 pp.Google Scholar
Fleming, C. A., 1952. The Geology of Wanganui Subdivision. Bull. geol. Surv. N.Z., 52, 1–362.Google Scholar
Häntzschel, W., 1939. Tidal Flat Deposits (Wattenschlick). In Trask, P.D., ed., Recent Marine Sediments. Tulsa.Google Scholar
Hedgpeth, J. W., 1957. Estuaries and Lagoons, II, Biological Aspects. In Hedgpeth, J. W., ed., Treatise on Marine Ecology and Paleoecology, Vol. 1 Ecology. Mem. geol. Soc. Amer., 67 (1), 693–729.Google Scholar
Holwill, F. J. W., 1963. The Succession of Limestones within the Ilfracombe Beds (Devonian) of North Devon. Proc. Geol. Ass., Lond., 73, 281–293.CrossRefGoogle Scholar
House, M. R., 1963. Devonian ammonoid successions and facies in Devon and Cornwall. Quart. J. geol. Soc. Lond., 119, 1–27.CrossRefGoogle Scholar
Newell, N. D., 1942. Late Paleozoic Pelecypods: Mytilacea. Univ. Kansas Publ. State geol. Surv. Kansas, 10 (2), 1–80.Google Scholar
Nota, D. J. G., 1958. Sediments of the Western Guiana Shelf. Reports of the Orinoco Shelf Expedition, Vol. II. Thesis, Wageningen.Google Scholar
Osburn, R. C., 1957. Marine Bryozoa. In Hedgpeth, J. W., ed., Treatise on Marine Ecology and Paleoecology, Vol. 1 Ecology. Mem. geol. Soc. Amer., 67 (1), 1109–1112.Google Scholar
Parker, R. H., 1959. Macro-Invertebrate Assemblages of Central Texas Coastal Bays and Laguna Madre. Bull. Amer. Ass. Petrol. Geol., 43, 2100–2166.Google Scholar
Scruton, P. C., 1955. Sediments of the Eastern Mississippi Delta. In Finding Ancient Shorelines: A Symposium. Spec. Publ. Soc. Econ. Pal. Min., 3, 21–51.Google Scholar
Shepard, F. P., and Moore, D. G. 1955. Sediment zones bordering the Barrier Islands of Central Texas Coast. In Finding Ancient Shorelines: A Symposium. Spec. Publ. Soc. Econ. Pal. Min., 3, 78–98.Google Scholar
Simpson, S., 1956. On the trace-fossil Chondrites. Quart. J. geol. Soc. Lond., 112, 475–499.CrossRefGoogle Scholar
Straaten, L. M. J. U. Van, 1951. Texture and genesis of Dutch Wadden Seas Sediments. Proc. 3rd int. Congr. Sediment. Groningen- Wageningen. 225–244.Google Scholar
Webby, B. D., 1964. Devonian corals and brachiopods from the Brendon Hills, West Somerset. Palaeontology, 7, 1–22.Google Scholar
Webby, B. D., 1965. The Stratigraphy and Structure of the Devonian Rocks in the Brendon Hills, West Somerset. Proc. Geol. Ass., Lond., 76, 39–60.CrossRefGoogle Scholar
Webby, B. D., in press. The Stratigraphy and Structure of the Devonian Rocks in the Quantock Hills, West Somerset. Proc. Geol. Ass., Lond.Google Scholar
Webby, B. D., and Thomas., J. M. 1965. Whitsun Field Meeting: Devonian of West Somerset and Carboniferous of North-East Devon. Proc. Geol. Ass., 7, 179–193.Google Scholar