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III.—Woodwardian Laboratory Notes.—North Wales Rocks

Published online by Cambridge University Press:  01 May 2009

T. G. B.
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Extract

Diabase-porphyrite—from hill designated as a Trigonometrical Station 1½ mile N.N.E. from Pwllheli: the hill is quarried for road metal; a good hand-specimen is easily obtained; it has a dark-green ground with porphyritic felspars up to ¼ inch long of pale greenish colour; a little pyrites; very slight effervescence with acids.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 10 , October 1880 , pp. 452 - 458
Copyright
Copyright © Cambridge University Press 1880

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