On some Nodular Felsites in the Bala Group of North Wales
Open Access
- 1 February 1882
- journal article
- Published by Geological Society of London in Quarterly Journal of the Geological Society
- Vol. 38 (1-4) , 289-297
- https://doi.org/10.1144/gsl.jgs.1882.038.01-04.32
Abstract
The great group of felsites associated, contemporaneously with sedimentary deposits of Bala age has been admirably described by Sir A. Ramsay in the Memoirs of the Geological Survey, and its extent is indicated on their maps. Some peculiar structures exhibited here and there in these ancient lava-flows have, I believe, remained hitherto undescribed, except by an incidental notice in that volume (pp. 93, 94), and in the Catalogue of Rock-specimens in the Jermyn-Street Museum. During the last two years I have devoted some time to the study of their microscopic structure, the results of which are perhaps of sufficient interest to be laid before the Society.Keywords
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