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V.—The Amount of Disseminated Silica in Chalk Considered in Relation to Flints

Published online by Cambridge University Press:  01 May 2009

A. J. Jukes-Browne
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Extract

It has been supposed, though I do not know who was the first to suggest it, that the total amounts of silica existing in the Chalk with flints and the Chalk without flints respectively are very nearly equal: the idea being that if the quantity of silica disseminated through the flintless Chalk could be accurately estimated it would be found to be nearly or quite as great as the amount existing in the shape of flints in an equal thickness of flinty Chalk.

Proceeding on this assumption it seems also to have been inferred that silica was originally disseminated through the mass of the Upper Chalk, and that this silica has in some mysterious way been concentrated into nodules and layers of flint, leaving the surrounding Chalk in the condition of a nearly pure calcareous material.

Type
Original Articles
Information
Geological Magazine , Volume 10 , Issue 12 , December 1893 , pp. 541 - 546
Copyright
Copyright © Cambridge University Press 1893

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References

page 541 note 1 The late David Forbes, F.R.S., in Proc. Geol. Soc-EDIT. GEOL. MAG.

page 542 note 1 Quart. Journ. Geol. Soc. vol. xlv. p. 405.Google Scholar

page 542 note 2 Quart. Journ. Geol. Soc. vol. xlv. p. 415.Google Scholar

page 543 note 1 Quart. Journ. Geol. Soc. vol. xlv. p. 414.Google Scholar

page 544 note 1 Chemical and Mineralogical Researches on the Upper Cretaceous zones of the South of England, London, 1893, p. 51.Google Scholar