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III.—The Origin and Mode of Formation of the Permian Breccias of the South Devon Coast

Published online by Cambridge University Press:  01 May 2009

Bernard Hobson
Bernard Hobson
Affiliation:
Lecturer in Petrology and Geology in the Victoria University of Manchester.
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Extract

After visiting in 1905 the excellent exposure of the Permo-Carboniferous Dwyka Conglomerate, containing glacially striated boulders, overlying glacially striated Barberton beds at the foot of Gotshe Mountain in the Vryheid district of Natal, it occurred to me to examine the Permian breccias of the South Devon coast to see whether I could find any evidence of their being of glacial origin.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 7 , July 1906 , pp. 310 - 320
Copyright
Copyright © Cambridge University Press 1906

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References

page 310 note 1 See Molengraaff, G. A. F., “Geology of the Transvaal,” Edinburgh, 1904, p. 66.Google Scholar

page 311 note 1 “Report on the Geology of Cornwall, Devon, and West Somerset,” 1839, p. 204.Google Scholar

page 311 note 2 “The Red Sandstones, Conglomerates, and Marls of Devonshire,” pt. ii: Ann. Rept. and Trans. Plymouth Inst., 1862-1863, p. 30.Google Scholar

page 311 note 3 “The Igneous Constituents of the Triassio Breccias and Conglomerates of South Devon”: Quart. Journ. Geol. Soc., 1890, pp. 71, 72.Google Scholar

page 311 note 4 See Plate XXI, Fig. 1.

page 311 note 5 Pengelly describes and figures false bedding at Slapton, Start Bay, and Goodrington Sands, Torbay: Trans. Plymouth Inst., 1862–3, p. 31.

page 311 note 6 See Ussher, W. A. E., Geol. of Torquay: Geol. Survey Mem., 1903, pp. 110, 111.Google Scholar

page 312 note 1 See Plate XXI, Fig. 2, and for section of Petit Tor see W. A. E. Ussher, Geol. of Torquay, Geol. Survey Mem., 1903, p. 109; and “Coast Section from Babbacombe to Watcombe,” by Ussher, W. A. E., Proc. Geol. Assoc., vol. xvi (1900), p. 434.Google Scholar

page 312 note 2 Ussher, W. A. E., “On the Age and Origin of the Watcombe Clay”: Rept. and Trans. Devon Assoc. Adv. Sci., ix (1877), p. 298Google Scholar; also section in Proc. Geol. Assoc., xvi, p. 434.

page 313 note 1 Quart. Journ. Geol. Soc., p. 496.

page 313 note 2 Ussher, & Teall, , Geol. of Exeter: Geol. Survey Mem., 1902, p. 78.Google Scholar

page 313 note 3 Quart. Journ. Geol. Soc., 1890, p. 76.Google Scholar

page 313 note 4 Geol. of Torquay: Geol. Survey Mem., 1903, p. 112.Google Scholar

page 313 note 5 Conybeare, Rev. J. J., “On the Red Rock Marle, or Newer Red Sandstone”: Annals of Philosophy, n.s., vol. i (1821), p. 257;Google Scholar Conybeare, & Phillips, , Geol. England and Wales, pt. i (1822), p. 294;Google Scholar also Ussher, , Geol. of Torquay, 1903, p. 111, line 4.Google Scholar

page 314 note 1 See Ormerod, G. W., “On the Murchisonite Beds of the Estuary of the Ex, and an attempt to classify the Beds of the Trias thereby”: Quart. Journ. Geol. Soc., 1875, p. 349Google Scholar, and section from Minnicombe to Lympstone, fig. 3.

page 315 note 1 Very likely a minute search might discover some.

page 315 note 2 Pengelly, says: “The pebbles lie with their longest axes parallel to the planes of bedding” (“The Red Sandstones, etc., of Devonshire,” pt. ii: Ann. Rept. and Trans. Plymouth Inst., 1862-1863, p. 31).Google Scholar

page 316 note 1 “The Great Ice Age,” 3rd ed. (1894), p. 274.Google Scholar

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page 317 note 1 “The Petrography of Dartmoor and its borders”: Trans. Devon. Assoc. Adv. Sci., vol. xxxiv (1902), p. 519.Google Scholar

page 317 note 2 Quart. Journ. Geol. Soc., 1892, p. 506.Google Scholar

page 317 note 3 “Morphologie der Erdoberfläche” (1894), vol. i, p. 280Google Scholar, line 18.

page 318 note 1 “Die Erde und das Leben” (1902), vol. ii, p. 86.Google Scholar

page 318 note 2 “Textbook of Geology,” 3rd ed (1893), p. 376; 4th ed (1903), p. 487.Google Scholar

page 318 note 3 “The Red Sandstones, Conglomerates, and Marls of Devonshire,” part ii: Ann. Rept. and Trans. Plymouth Inst., 1862-1863, p. 31.Google Scholar

page 318 note 4 Loc. cit., p. 29.

page 318 note 5 Same paper, part iii (1864–5), p. 40.

page 318 note 6 “On the Triassic Rocks of Somerset and Devon”: Quart. Journ. Geol. Soc., 1876, p. 392.Google Scholar

page 318 note 7 Loc. cit., p. 45.

page 318 note 8 “Elements of Geology,” 6th ed. (1865), p. 18.Google Scholar

page 318 note 9 “The Building of the British Isles,” 2nd ed (1892), p. 168.Google Scholar

page 318 note 10 Proc. Geol. Assoc., vol. xvi (1900), p. 434.Google Scholar

page 319 note 1 See also Irving, Rev. Dr. A., Quart. Journ. Geol. Soc., 1888, p. 157.Google Scholar

page 319 note 2 Pengelly, (Trans. Plymouth Inst., 1862-1863, p. 29)Google Scholar gives the dip at Ness Point as 5° to N. 129 E. mg. = E. 15½° S. true.

page 319 note 3 Ussher, , “Geology of Exeter”: Geol. Survey Mem., 1902, p. 59.Google Scholar Hobson, B., “Basalts and Andesites of Devonshire, etc.”: Quart. Journ. Geol. Soc., 1892, p. 500.Google Scholar