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XXIX.— SOME NOTES ON THE GEOLOGY OF BEAY HEAD, 

 WITH A GEOLOGICAL MAP AND SECTIONS. By 

 GERRARD A. KINAHAN. Plates XXIY., XXY., XXYL 



[Received August, 1882.] 



While studying Geology, some few years ago, at the College of 

 Science, Dublin, in order to familiarize myself with field Geology 

 and practical work, I examined and mapped the more continuous 

 sections of the Cambrian Rocks exposed on Bray Head. Since 

 then I have examined and mapped the surface of other parts of 

 the hill ; and, as a geological map with some sections of this dis- 

 trict may be of interest to the Society, I have been induced to 

 lay it before them, especially as it will be more accessible in their 

 Proceedings than the map of the Geological Survey. I have care- 

 fully compared them together, and find them to agree in the 

 main. In this map, however, more breaks have been inserted ; 

 these cannot be taken as absolutely correct, but are what ap- 

 peared to me, when on the ground, to be best calculated to explain 

 the peculiarities, especially those of the quartz rocks. 



As the rocks of this area have been the subject of many 

 papers, and of much discussion,* I have refrained from giving a 



* Such as:--" On the Rocks of Bray Head." Prof. Oldham, Journal Geo, Soc. Dub- 

 lin, vol. iii., p. 60. 



"Quartz Rocks of Bray Head and Howth." John Kelly, Esq., Journal Geo. Soc. Dub- 

 lini vol. v., p. 237. 



" On the Structure of the North-Eastern part of Wicklow." By J. Beete Jukes and 

 Andrew Wyley, Esqrs., Journal Geo. Soc. Dublin, vol. vi., p. 28. 



" On Annelloid Tracks in Rocks of Bray Head." By J. R. Kinahan, m.e., Journal 

 Geo. Soc. Dublin, vol. vii., p. 184. 



" On the Organic Relations of the Cambrian Rocks of Bray (Co. Wicklow) and Howth 

 (Co. Dublin), with Notices of the most remarkable Fossils." Professor Kinahan, 

 Journal Geo. Soc. Dublin, vol. viii., p. 68. 



" On Haughtonia, a new genus of Cambrian Fossils," By Professor J, R. Kinahan, 

 M.D , F.L.s,, Journal Geo. Soc, Dublin, vol, viii., p. 116. 



" The Genus Oldhamia : its characters, probable affinities, modes of occurrence, and 

 a description of the nature of the localities in which it occurs." By J. R, Kinahan. Trans. 

 Royal Irish Academy (Science), vol. xxiii., p, 547. 



" On a Trap Dyke at Bray Head, Co. Wicklow," by W. H. Stackpoole Westropp, 

 M.K.I.A., Journal Royal Geo. Soc. Ireland, vol. i,, p, 149. 



" On the Lower PaliBozoic Rocks of the South-East of Ireland and their Associated 

 Igneous Rocks," By J. Beete Jukes, M.A., f.e.s., &c., &c., and Rev. Professor Hanghton, 

 M.A., F.T.c.D.jF.it.s. Trans. Royal Irish Academy, vol, xxiii,, p. 563. 



