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The Action of Colloids in Precipitating Fine-Grained Sediments1

Published online by Cambridge University Press:  01 May 2009

P. G. H. Boswell
P. G. H. Boswell
Affiliation:
University of Liverpool.
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Extract

With certain well-known exceptions, ancient sandy and clayey sediments do little more than approach a condition of uniform grain-size. The so-called clays, silts and sands, and their consolidated equivalents, the mudstones, shales, silt-stones and sandstones, receive their appellation in most cases from the dominant grade present. Actually they consist of a mixture of particles, distributed over a considerable range of grain-size, in which the dominant grade, especially in the case of the finer deposits, often amounts to less than 50 per cent of the whole.

Type
Original Articles
Information
Geological Magazine , Volume 67 , Issue 8 , August 1930 , pp. 371 - 381
Copyright
Copyright © Cambridge University Press 1930

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Footnotes

1

Summary of paper read before Section C of the British Association at Cape Town, 1929.

References

page 373 note 1 Professor Baly has accumulated much interesting experimental information which it is hoped will become available to geologists before long.

page 373 note 2 See, for example, Cox, G. H., Dean, R. S., and Gottschalk, V. H., Bull. School of Mines and Met., Missouri, Nov., 1916, p. 7;Google Scholar Correns, C. W., “Die petrographisch wichtigen Methoden der Kolloidchemie,” Fortschr. Min. Krist. Petr., vol. x, p. 139, 1925, and references therein cited;Google Scholar also Sampson, E., Journ. Geol., vol. xxvi, 1923, p. 598.Google Scholar

page 373 note 3 Except perhaps “acid” fuller's earth, which has been said to be electropositive, although my own experiments with ordinary fuller's earth give a contrary result.

page 373 note 4 “Suspensate,” a term due to Professor F. G. Donnan, F.R.S., is used to indicate the inorganic material, sand, silt, clay, etc., which is in suspension. The term “suspensoid” is pre-occupied.

page 374 note 1 In the case of the gelatinous silica, 1 gm. contained .38 gm. of silica dried at 105° C.

page 376 note 1 Econ. Geol., vol. xxiv, p. 285, 1929. My experimental work was carried out and this paper prepared before the appearance of Messrs. Moore and Maynard's most valuable contribution.Google Scholar

page 378 note 1 This manuscript was in the Editor's hands before the appearance of Prof. E. B. Bailey's notes on “graded bedding” in the Geological Magazine of February, 1930. It seems to me that Prof. Bailey overestimates the difficulties of explaining the formation of graded bedding.

page 380 note 1 Quart. Journ. Geol. Soc., vol. lxxxv, p. 620, 1929.Google Scholar

page 380 note 2 Bull. Geol. Soc. Amer., vol. xl, p. 133, 1929 (abstract). Since published as U. S. G. S. Prof. Paper No. 158 E.Google Scholar

page 380 note 3 Except in the case of gelatinous silica.

page 380 note 4 Op cit., p. 274.

page 380 note 5 Op. cit., pp. 272–303, 365–402, and 506–27. On p. 512 the authors touch on the problem of co-precipitation.

page 381 note 1 Sargent, H. C., Geol. Mag., Vol. LXVI, 1929, pp. 399–413.CrossRefGoogle Scholar