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I.—Remarks upon the Relations and Grouping of the Permian and Triassic Rocks

Published online by Cambridge University Press:  01 May 2009

Horace B. Woodward
Affiliation:
Of the Geological Surrey of England and Wales.

Extract

The physical history of the Permian and Triassic rocks of Great Britain has been told by Professor Ramsay, who has pointed out that the beds were deposited in great inland lakes, for the most part salt. Without entering into the consideration of this subject, there seems to be much that requires to be unravelled in regard to the structure of the beds individually, and much that has yet to be explained in regard to the relations and grouping of the rocks.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1874

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References

page 385 note 1 Quart. Journ. Geol. Soc., vol. xxvii. pp. 189, 241.Google Scholar

page 385 note 2 Published by the Geological Survey.Google Scholar

page 386 note 1 See Mr. Bristow's “ Tables of Strata” (published by Stanford.).Google Scholar

page 386 note 2 See Explanation of Quarter Sheet 98 S.E. of the Geological Survey Map of England, pp. 28, 29.Google Scholar

page 386 note 3 Quart. Journ. Geol. Soc., vol. xxiv. p. 327.Google Scholar

page 386 note 4 Explanation of Quarter Sheet 93 S.W., p. 10.Google Scholar

page 387 note 1 Memoir on the Triaesio and Permian Rocks, p. 41.Google Scholar

page 387 note 2 Geol. Mag. Decade II. Vol. I. pp. 315, 316.Google Scholar

page 387 note 3 Proc. Belfast Nat. Hist. Soc., 1873, p. 41.Google Scholar

page 387 note 4 The italics are mine.Google Scholar

page 387 note 5 The Triassic and Permian Rocks of the Midland Counties of England. Memoirs of the Geological Surrey of England and Wales, 1869, p. 66.Google Scholar

page 388 note 1 Op. cit. pp. 86, 87.Google Scholar

page 388 note 2 Idem. p. 64.Google Scholar

page 388 note 3 Hull, , op. cit. p. 106.Google Scholar

page 388 note 4 The name Permian has sometimes crept in through a misunderstanding of the Dolomitic (or Magnesian) Conglomerate.Google Scholar

page 388 note 5 These Maps include Sheets 19, 20, 21, and 22. The Sandstone is not designated 88 Bunter, and the boundary between it and the New Bed Marl is not engraved in Sheets 21 and 22. The whole area has been undergoing revision, and the new edition of Sheet 19 is now published.Google Scholar

page 388 note 6 This coast-line has been described and diagrams of the sections drawn by De la Beche, , Trans. Geol. Soe. 2nd series, vol. i. p. 40, plate viii. (Bridport to Sidmouth); Buckland, Idem. p. 95, Plate xiv. (Portland to Lyme Regis, and Branscombe to Sidmouth); Whitaker, Quart. Journ. Geol. Soc. vol. xxv. p. 152 (Dowlands Landslip to Bahbacomhe Bay). See also Pengelly, Trans. Plymouth Inst. for 1862–65; Trans. Devon. Assoc. for 1863. My notes on the coast-section (which, however, add nothing to what has been written before) were made in company with my colleague, Mr. W. A. E. Ussher. He has done the greater part of the re-survey of the red rocks between Taunton and Exeter, in which tract he has been enabled to trace out, with marked persistence, the different divisions seen in the coast-section, whilst I have been similarly successful in the smaller areas on which I have been engaged. The details of this work will probably be published on some future occasion.Google Scholar

page 389 note 1 See section by Godwin-Austen, , Trans. Geol. Soc. 2nd ser. vol. viii. pl xlii. fig. 5.Google Scholar

page 389 note 2 Here, it may be observed, we approach the Torquay limestone.Google Scholar

page 389 note 3 See the writings of Dela Beche, and Pengelly; also Whitaker, op. cit. p. 157; and H. B. W. Science Gossip, No. 115, July, 1874, p. 165. The thickness of the strata has been estimated at from 1850 feet to four miles or more Probably the former estimate by De la Becbe is nearest the truth.Google Scholar

page 390 note 1 The Permian flora is, upon the whole, very nearly allied to that of the Coal-measures, thoegt the Permian species are mostly distinct, and there are some new genera. In the Trias are found some Paleozoic types, as Catamites.—Nicholson, Manual of Palaeontology, pp. 494, 633.Google Scholar

page 390 note 2 Student's Elements, 1871, p. 366.Google Scholar