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Mineral Analyses of Some Ordovician Rocks from Carnarvonshire

Published online by Cambridge University Press:  01 May 2009

S. A. Billinghurst
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Extract

Very little work seems to have been done on the petrology of the rarer constituents of the older Palaeozoic sediments and their associated igneous rocks, partly no doubt on account of the extra amount of work entailed in crushing these extremely hard compact rocks, and partly owing to the comparative paucity of the “heavy” residues obtained, which give small reward for the energy expended. Such work, however, is highly important as indicating further sources of supply, to which workers on the petrology of the newer rocks may look, and it may be here emphasized that Wales has unfortunately suffered neglect in this respect. It is to help remedy this defect that the present paper is put forward.

Type
Original Articles
Information
Geological Magazine , Volume 66 , Issue 7 , July 1929 , pp. 289 - 301
Copyright
Copyright © Cambridge University Press 1929

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References

page 290 note 1 Sargent, H. C., “Notes on the Petrology of Penmaenmawr Mountain,” Proc. Lpl. Geol. Soc., vol. xiv, 1924, pp. 85–94, and pt. ii, 1925, pp. 123–34.Google Scholar

page 294 note 1 Williams, H., “The Geology of Snowdon (North Wales),” Q.J.G.S., vol. lxxxiii, 1927, p. 390Google Scholar. The author states that almandine garnets are “plentiful” in similar rocks in the Sychnant Pass. See also same author, Geol. Mag., 1922, p. 187.Google Scholar

page 295 note 1 Boswell, P. G. H., “On the Distribution of Purple Zircon in British Sedimentary Rocks,” Min. Mag., vol. xxi, 1927, p. 314.Google Scholar

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page 301 note 2 See map in above Memoir, vol. ii, p. 778.Google Scholar Dr. Greenly has also suggested this possibility in the case of kyanite in a personal communication.

page 301 note 3 Double, I. S., “The Petrology of Triassic Boulders from the Boulder Clay of Anglesey,” Proc. Lpl. Geol. Soc., vol. xv, pt. i, 1928, pp. 63–8.Google Scholar