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III.—A New British Phonolite

Published online by Cambridge University Press:  01 May 2009

Frederick H. Hatch
Frederick H. Hatch
Affiliation:
GEOLOGICAL SURVEY OFFICE, 28, JERMYN STREET, S.W.
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Extract

In working out, at the request of Sir Archibald Geikie, the petrography of the Lower Carboniferous Volcanic rocks in Haddingtonshire (the results of which I propose shortly to publish), I have been led to examine the igneous material that builds up the isolated hills (necks), situated on the margin of the volcanic area of the Garlton Hills. Among these, the rock of Traprain Law especially attracted my attention. It is a close-grained, dark brown to grey rock. Some varieties have a glistening or greasy surface, and are speckled over with dark spots, while others show glancing cleavage surfaces of a clear glassy felspar (sanidine).

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 4 , April 1892 , pp. 149 - 150
Copyright
Copyright © Cambridge University Press 1892

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