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On the origin of septarian structure

Published online by Cambridge University Press:  14 March 2018

W. Alfred Richardson
W. Alfred Richardson*
Affiliation:
University College, Nottingham
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Extract

In the Geological Magazine for 1918 there appeared three papers discussing the origin of tile system of cracks ill septarian nodules. Dr. A. Morley Davies opened the discussion in a paper where, after a summary of earlier literature, he again put forward an older idea. Without adducing evidence, he considered :

  1. (a) that interposition of particles between those of the original matrix caused expansion which set up tensile strain in the growing body ;

  2. (b) that the cracking of the nodule was due to the relief of those tensile stresses.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 18 , Issue 86 , May 1919 , pp. 327 - 338
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1919

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References

page 327 note 1 Davies, A. M., Geol. Mag., 1913, dec. 5, vol. x, pp. 99-101Google Scholar.

page 327 note 2 J. E. Todd, ibid., pp. 861-364.

page 327 note 3 T. Crook, ibid., pp. 514-515.

page 338 note 1 A. Geikie (Text-book of Geology, 1908, 4th ed., p. 186) alone describes the cracking as polygonal.

page 338 note 2 A similar figure of cracks in a dried clay film is given by S. Mcunier, La G~ologie exp6rimentale, Paris, 1899, p. 219, fig. 36.

page 329 note 1 T. Laslett and H. M. Ward, Timber, 1894, pp. 54-58.

page 331 note 1 Todd, J. E., loc. cit. ; also Bull. Geol. Soc. Amer, 1908, vol. xiv, pp. 353–368 Google Scholar.

page 332 note 1 Hamilton, A., Trans. New Zealand Inst., 1901, vol. xxxiv, pp. 447–451 Google Scholar. Mantell, G. A., Proc. Geol. Soc., 1850, vol. vi, p. 319Google Scholar and figure.

page 332 note 3 For a general analysis see A. Morley, Strength of Materials, London, 1908, pp. 298-297.

page 333 note 1 I have to thank the Rev. A. Thornley and Miss Andrews for bringing this interesting and critical example to my notice.

page 333 note 2 Todd, J. E., Bull. Geol. Soc. Amer., 1903, vol. xiv, p. 359Google Scholar.

page 334 note 1 S. Meunier, loc. cit.

page 335 note 1 J. E. Todd, loc. cit., 1908, p. 360.

page 336 note 1 For a brief account of these theories see Cole, G. A. J., Geol. Mag, 1917, dec. 6, vol. iv, pp. 64-68Google Scholar.

page 336 note 2 R. E. Liesegang, Geologische Diffusionen, Dresden and Leipzig, 1918, chap. vi.

page 336 note 3 J. Geikie, Structural and Field Geology, Edinburgh, 1912, p. 121.

page 336 note 4 For the section at Bracebridge see A. E. Trueman, Geol. Mag., 1918, dec. 6, vol. v, p. 108.

page 336 note 5 Pocock, R. W. and Wells, L., Proc. Geol. Assoc., 1914, vol. xxv, p. 78Google Scholar.

page 336 note 6 R. E. Liesegang, loc. cit., chap. x, Rhythmische Fallungen.