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IV.—Physiography of the Lower Trias7

Published online by Cambridge University Press:  01 May 2009

T. Mellard Reade
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Extract

The origin of the Triassic rocks of Britain is a question that has excited from time to time much interest and varied speculation. The entire absence of fossils in the Lower Trias or Bunter Sandstone has led the majority of geological reasoners to look to causes other than marine action for an explanation of its characteristic features. The late Mr. Godwin-Austen was of opinion that the whole of the Triassic rocks were laid down in freshwater lakes which, passing through the brackish stage, become finally saturated with saline matter through evaporation exceeding the inflow of fresh water. It has been felt, however, by other geologists, that this theory, while accounting fairly well for the upper deposits of the Triassic age, does not fit in with the phenomena of current bedding, the presence and distribution of the numerous quartzite and other well-rounded pebbles, and the comparative absence of marl-beds, which distinguish the Lower Trias or Bunter Sandstones.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 12 , December 1889 , pp. 549 - 558
Copyright
Copyright © Cambridge University Press 1889

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Footnotes

7

Read at the Brit. Assoc., Newcastle-on-Tyne, in Section C. (Geology), Sept. 1889.

References

page 550 note 1 Presidential Address, Geological Section of British Association, 1886.

page 550 note 2 On the Constitution and History of Grits and Sandstones, Q.J.G.S. 1881, p. 27.Google Scholar

page 550 note 3 Triassic and Permian Rocks of the Midland Counties of England, Memoirs of the Geol. Survey, 1869, p. 10.Google Scholar

page 552 note 1 The following papers bearing upon the subject are well worthy of study: “On the Nature and Probable Origin of the Superficial Deposits in the Valleys and Deserts of Central Persia,” Blanford, W. T., Q.J.G.S. 1873, pp. 493–502.CrossRefGoogle Scholar “Alluvial and Lacustrine Deposits and Glacial Records of the Upper Indus Basin,” F. Drew, Ibid, pp. 441–71.—“Journal Across Central Asia,” by Lieut. Younghusband, ,Google Scholar describing Gravels from the Altai Mountains and Sandhills, 900 feet high, “Nature,” 1888, 05 17, pp. 65–6Google Scholar.

page 553 note 1 See Bonney, Address to the Geological Section of British Association, 1886, and Geol. Mag. 1883, p. 199; 1888, p. 55. —Harrison, . Proc. Birmingham Phil. Soc. 1882, vol. iii. p. 157.Google Scholar —Hull, , Geol. Mag. 1883, p. 285.Google Scholar

page 554 note 1 Physiography of the Triassic Period, “Naturalist,” pp. 108–111, 04, 1889.Google Scholar

page 555 note 1 Tidal Action as a Geological Cause, Proceed, of L'pool. Geol. Soc. 1873–4; Tidal Action as an Agent of Geological Change, Phil. Mag. May, 1888.

page 556 note 1 See records of some remarkable borings in Woodward's, “Geology of England and Wales,” second edition, facing p. 612, also the accompanying Geological Map of England and Wales.Google Scholar

page 556 note 2 See Quartzite Pebbles of the Drift and Triassic Strata of England, Proc. of Birmingham Phil. Society, vol. iii. p. 157 (1882);Google Scholar On the Triassic Rocks of Somerset and Devon, Ussher, W. A. E., Q.J.G.S. vol. xxxii. p. 367 (1876);CrossRefGoogle Scholar Notes on the Classification of the Triassic Beds of the South-West of England, H. B. Woodward Geol. Survey Memoir on E. Somerset and Bristol Coalfields; Red Rock Series of the Devon Coast, RevIrving, A., Q.J.G.S. 1888, p. 149.CrossRefGoogle Scholar

page 557 note 1 See papers already quoted.