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IV.—The Basic Intrusions East of Gelli Hill, Radnorshire

Published online by Cambridge University Press:  01 May 2009

H. G. Smith  and
J. H. Williams
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Extract

During the last few years I have spent a considerable amount of time studying the geology of the country east of Llandrindod, but much still remains to be done, and the present paper merely embodies a few of the points which seem to be satisfactorily established with regard to a small portion of the area. Three distinct types of igneous rocks are recognized, and some facts and ideas with regard to each are put forward.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 11 , November 1918 , pp. 500 - 507
Copyright
Copyright © Cambridge University Press 1918

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References

page 500 note 1 Dr. Harker (Presidential Address to the Geological Society, Q.J.G.S., pt. i, 1917) mentions the existence of basalts in the Wells country, and considers them to be extrusive.

page 501 note 1 Fearnsides, W. G., Geology in the Field, 1910, p. 801Google Scholar.

page 501 note 2 Proc. Geol. Assoc., vol. xix, p. 179, 1905Google Scholar.

page 501 note 3 Tertiary Igneous Rocks of Skye (Mem. Geol. Surv.), 1904, p. 3Google Scholar.

page 502 note 1 Q.J.G.S., vol. 1, p. 576, 1894Google Scholar.

page 504 note 1 This power of selection is implied by Professor Watts in his description of the intrusions of the Shelve area (Proc. Geol. Assoc., vol. xiii, p. 342, 1894Google Scholar).

page 504 note 2 Loc. cit., p. 577.

page 504 note 3 Loc. cit., pp. 339–40.

page 504 note 4 Q.J.G.S., vol. lxi, p. 631, 1905Google Scholar.

page 504 note 5 Bala Volcanic Series, 1889, p. 76Google Scholar.

page 504 note 6 Geology in the Field, 1910, p. 803Google Scholar.

page 505 note 1 Guide to Rocks and Fossils (Geol. Surv. Ireland, 1895, p. 78)Google Scholar.

page 505 note 2 Petrology for Students, 4th ed., 1908, p. 103Google Scholar.

page 506 note 1 Q.J.G.S., vol. lxvii, pp. 196–201, 1911Google Scholar.