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V.—The Probable Source of the Limestone Pebbles in the Bunter Conglomerate of West Somerset

Published online by Cambridge University Press:  01 May 2009

Edgar C. Martin
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Extract

When the Budleigh Salterton Pebble-bed is traced northward into Somerset it loses its unconsolidated character and passes into a calcareous conglomerate. The change takes place north of Burlescombe, and is complete at Thone St. Margaret; thence to Combe Florey this division of the New Red Sandstone Series is generally represented by a conglomerate composed of pebbles of limestone, quartz, and grit, more massive in its lower part. For some distance north of Combe Florey the upper beds of the division are faulted out and the lower beds are represented by a loose, rubbly gravel of subangular fragments of Devonian grit in an earthy or sandy matrix. The conglomerate reappears at Vellow, near Stogumber, and is found in several places in the Williton district, whilst in other places it is represented by gravels, sands, and sandstones.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 4 , April 1909 , pp. 160 - 165
Copyright
Copyright © Cambridge University Press 1909

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References

page 161 note 1 Memoirs of the Geological Survey: “Geology of the Quantock Hills, etc.,” 1908, p. 46.

page 161 note 2 Ibid.: “Geology of the Country between Wellington and Chard,” 1906, p. 14.

page 161 note 3 Thomas, H. H. B.A., F.G.S., “The Mineralogical Constitution of the Finer Material of the Bunter Pebble-bed in the West of England”: Q.J.G.S., 1902, pp. 620–32.Google Scholar

page 161 note 4 Report on the Geology of Cornwall, Devon, and West Somerset, 1839, p. 55.

page 161 note 5 Memoirs of the Geological Survey: “The Geology of the Country around Bridgend,” 1904, ch. v.

page 164 note 1 Rev. Downes, W. B.A., F.G.S., Transactions of the Devonshire Association, 1878–1879.Google Scholar

page 164 note 2 A useful summary and discussion of these papers is given by Shrubsole, O. A. F. G. S., in a paper “On the Probable Source of some of the Pebbles in the Triassic Pebble-beds of South Devon and of the Midland Counties”: Q.J.G.S., 1903, p. 311.Google Scholar

page 165 note 1 “Geology of the Quantock Hills, etc.,” p. 42.

page 165 note 2 Ibid., p. 43.

page 165 note 3 Geol. Mag., 1908, pp. 150–7.

page 165 note 4 See Ussher's, W. A. E. paper on “The British Culm Measures”: Proc. Somersetshire Arch, and Nat. Hist. Soc., 1892.Google Scholar