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On Rutile in the Dogger

Published online by Cambridge University Press:  01 May 2009

R. H. Rastall
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Extract

In several papers by the present author alone or in collaboration with Dr. J. E. Hemingway, mention has been made of the abundance of the titanium minerals, rutile, anatase, and brookite, in the Middle Jurassic sediments of Yorkshire. One of these papers dealt with brookite crystals from the Dogger, and the present one will describe briefly the types of rutile crystals from the same formation; partly because these show interesting peculiarities, and partly, as a subsidiary object, because it has appeared during this investigation that the descriptions given in most of the books of reference of sedimentary rutiles are somewhat inadequate, several striking features found to be widely prevalent not being mentioned in any of them, while other points are dealt with very briefly by most authors. A beginner in sedimentary petrography, confronted with a heavy mineral concentrate of this kind, might find considerable difficulty in identifying the crystals of rutile.

Type
Original Articles
Information
Geological Magazine , Volume 76 , Issue 3 , March 1939 , pp. 109 - 115
Copyright
Copyright © Cambridge University Press 1939

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References

page 109 note 1 Rastall, , “The Petrography of some Jurassic Sandstones in Eskdale,” Proc. Yorks Geol. Soc., xxii, 1932, 93;CrossRefGoogle Scholar Rastall, and Hemingway, , “The Petrography of the Blea Wyke Series,” Geol. Mag., LXXII, 1935, 125;CrossRefGoogle Scholar Rastall, , “On Brookite Crystals in the Dogger,” Geol. Mag., LXXV, 1938, 433.CrossRefGoogle Scholar See also Smithson, , Proc. Yorks Geol. Soc., xxii, 1934, 188.Google Scholar

page 110 note 1 Dana, , Textbook of Mineralogy, 4th edition, revised by W. E. Ford, 1932, 498.Google Scholar

page 111 note 1 Iddings, , Rock Minerals, New York, 1906, 497.Google Scholar

page 113 note 1 British Petrography, pl. xliv, fig. 4.

page 114 note 1 Rastall, , Proc. Yorks. Geol. Soc., xxii, 1932, 93–9.CrossRefGoogle Scholar

page 114 note 2 Gilligan, , Quart. Jour. Geol. Soc., lxxv, 251–294.Google Scholar