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On Brookite Crystals in the Dogger

Published online by Cambridge University Press:  01 May 2009

R. H. Rastall
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Extract

In the course of work in collaboration with Dr. J. E. Hemingway on the petrography of the Dogger of North-East Yorkshire it has been found that brookite is widely distributed as a “heavy mineral” constituent in several different kinds of sediment. This is in agreement with results obtained earlier by myself alone in the study of sandstones from higher horizons of the Middle Jurassic in Yorkshire. Although it does not yet appear that the distribution of brookite in the Dogger is of any particular significance, nevertheless the mineral itself shows interesting peculiarities and variations; a detailed discussion of these would be out of all proportion in the paper which we hope to publish shortly on the character and distribution of the Dogger in general; and it has therefore been decided to give here a brief and mainly mineralogical account of the different varieties of brookite met with, without discussing the general problem of the abundance of titanium minerals in the Yorkshire Jurassics and their local distribution.

Type
Original Articles
Information
Geological Magazine , Volume 75 , Issue 10 , October 1938 , pp. 433 - 440
Copyright
Copyright © Cambridge University Press 1938

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References

page x note page 433 note 1 Proc. Yorks. Geol. Soc., xxii, 1932, 93.Google Scholar

page x note page 433 note 2 Min. Mag., xxiii, 1932, 126; also Lindsey, Min. Mag., xiv, 1905, 96.Google Scholar

page x note page 437 note 1 The dark and speckled type of crystal here mentioned, which is common in more than one habit, is not shown in any of the accompanying figures, for obvious reasons. Some are almost opaque.Google Scholar

page x note page 438 note 1 Proc. Geol. Assoc., xxxix, 1928, 31.Google Scholar

page x note page 439 note 1 Mikroskopische Physiographie, I, i, 1921, 135 and I, ii, 277.Google Scholar

page x note page 439 note 2 Zepharovich, , Zeits. f. Krist., viii, 1884, 577.Google Scholar