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IV.—On Quartzite Lenticles in the Schists of South-Eastern Anglesey1
Published online by Cambridge University Press: 01 May 2009
Extract
The prevailing type of schist in the south-east of Anglesey, for some miles to the north and north-west of Beaumaris, is a wavily foliated, pale-green, chloritic rock, the quartz in which, though more abundant than appears at first glance, is in a very fine state of subdivision. In a common variety, especially prevalent about Llanddona, quartz forms nearly the whole of the rock, but it is still in very compact seams, separated by partings of chlorite or mica.
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- Copyright © Cambridge University Press 1896
Footnotes
1
An abstract of this paper was read before the British Association, Liverpool, September, 1896.
References
page 551 note 2 There are other green schists in the same area, which are probably of igneous or pyroclastic origin.
page 552 note 1 An explanation, practically the same, was applied by Sir A. Geikie and Mr. Peach to some rocks of doubtful age in the neighbourhood of Llangefni, Anglesey. (Geikie, , Pres. Address Geol. Soc. 1891, p. 130.Google Scholar)
page 552 note 2 I have since seen the breaking up of a banded slate into rounded fragments, on a small scale, though very markedly, at Llyn Padarn, Llanberis. Mr. Lamplugh, however, lays stress, and I think justly, not so much on the bare occurrence of the phenomenon as on its great scale and extent, in the Isle of Man.
page 553 note 1 The appearances of irregular or intrusive junction figured by Professor Blake are deceptive, being due to the form of the present outcrop. Such discordance as exists is not more than that which sometimes occurs at the margins of smaller lenticles, and may be expected in any highly disturbed region. The relations of this mass of quartzite do not, I think, necessitate our referring its origin to causes acting locally or sporadically.