Experimental Researches on the Granites of Ireland

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Abstract
The granitic rocks of Leinster, or South-east of Ireland, occur in the counties of Dublin, Carlow, Kilkenny, Wicklow, and Wexford, and may be divided physically into two distinct groups (see Map, fig. 1, p. 172):— 1. The main chain of granite-hills, extending from Booterstown, county Dublin, to Poulmonnty, in the south of the county of Carlow, within five miles of New Ross. This granite-chain is unbroken throughout its extent, and has a length of sixty-eight miles, and a breadth varying from eight to fifteen miles. 2. Besides the main chain there are about twenty isolated granitic districts in the counties of Wicklow and Wexford, forming small islands, as it were, of granite, which have penetrated and broken through the Silurian slate of those counties. The general axis of each of these granitic outbursts is parallel to that of the main chain; these secondary granitic rocks are found at intervals for a distance of forty-three miles, from Ballinaclash, county Wicklow, to Camaross Hill, county Wexford. I propose to give a short mineralogical sketch of these two groups of granitic rocks, which, considered as groups, are distinguished from each other by well-marked chemical differences, not hitherto observed.

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