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Natic€ respecting the Geological Structure of the Vicinity of 

 JDublin; with an Account of some rare Minerals found in 

 Jreland. By William Fitton, M. D. Communicated, 

 by L. Horner, Ij^sq. Sec. to the Geological Society*, 



f^utu °^ *^° ^^ following obsei vations are to be ascribed principally 



to the late Rev. Walter Stephens. I present them to the 

 Geoloj^ical Society in their present imperfect form, with 

 the hope that they may attract the attention of mineralo- 

 gists to the country in the vicinity of Dublin ; for they are 

 sufficient to show, that very interesting information may be 

 expected from a correct exaniindtion of that district ; which 

 from its situation is ejisy of access, and presents many ad- 

 vantages to the observer. I shall subjoia to a brief state- 

 ment respecting the geological structure of that country, an 

 acQOunt of some minerals of not very cominon occyrrence* 

 recently found in Ireland. 



J^^ ^T*"^^ ^^^ ^^'^ °^ Dublin is placed in a flat limestone country, 

 at the distance of about five miles to the northward of a 

 range of mountains, which form the verge of a mountain-!^ 

 ous district, extending thence for more than thirty miles 

 to the southward. Through this trpct there passes, in a 

 south-western direction from the shore on the south side of 

 Dublin bay, a broad body of granite, bounded on its eastern 

 and western sides by incumbent rocks of great variety; the 

 structure and relations of which, as well as of the granite 

 mass, are in many places very distinctly exhibited. 



Mines, Within this mountainous district, distinguished by the in- 



teresting and beautiful scenery which it presents, are found the 

 copper mines ofCronebane and Bally murtaghf; and the lead 

 n)ines of Glenmalur ; the veins of lead ore at Dalkey, and 

 that near the Scalp also belong to it. The stream works 

 commonly called the Gold mine, at the mountain Croghan 



* Transactions of the Geological Society, vol, I, p. 259. 



+ An account of the metalliferous waters of these mines was published 

 in the Philosophical Transactions so far back as the year 1752, toIs. 

 XLVlI, and :5^LVIU, 



Kinshela, 



