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III.—On the Metamorphic and Intrusive Rocks of Tyrone1

Published online by Cambridge University Press:  01 May 2009

J. Nolan
J. Nolan
Affiliation:
H.M. Geological Survey of Ireland.
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Extract

The rocks I propose to describe in this paper belong to that great metamorphic series which occupies so large a portion of the north of Ireland, extending over most of the counties Tyrone, Londonderry, and Donegal. For the present I shall confine, my observations principally to that portion of them situated about the central parts of Tyrone, from the vicinity of Omagh eastwards and north-eastwards towards Slieve Gallion. This district has “Geological Report on Londonderry and parts of Tyrone and Fermanagh”; but as, during the progress of my work for the Geological Survey, I have had opportunities for a very detailed examination of it, I beg, briefly, to offer some further remarks and conclusions.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 4 , April 1879 , pp. 154 - 160
Copyright
Copyright © Cambridge University Press 1879

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References

page 155 note 1 I use the term syenite in the same sense as it is used in Jukes's Student's Manual of Geology, viz. “ A crystalline granular aggregate of felspar, hornblende, and quartz.”

page 160 note 1 Mr. Symes describes an intrusive granite near Westport as “ of older date than the Upper Silurian period,” but there does not seem to be any evidence to fix its age more definitely. See Geol. Survey Memoir to accompany Sheets 83 and 84.