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VII. 



EEPOET ON THE " DINGLE BED " EOCKS IN THE DINGLE 



PENINSULA, CO. KEEEY. 



By ALEXANDEE McHENEY, M.E.LA., 



Geologist, Geological Survey of Ireland (retired). 



Plates XX, XXL 



[Read January 22. Published February 20, 1912.] 



The question as to the true geological horizon of the " Dingle Beds " in the 

 Dingle peninsula, is one that has engaged the attention of many geologists 

 for OA'er fifty years, and, so far, without any definite opinion having been 

 arrived at. 



Amongst those who have dealt with these rocks were Sir E. Griffith, 

 Professor Jukes, Professor Hull, John Kelly, A. B. Wynne, G. V. Du Noyer, 

 G. H. Kinahan, and the Geological Survey of Ireland generally. It will be 

 seen from the papers of the writers mentioned, and the publications of the 

 Geological Survey, that all considered the " Dingle Beds " to be either the 

 highest beds of the Upper Silurian, or portion of the Devonian or Lower Old 

 Eed Sandstone formations. 



Sir E. Griffith regarded the beds as belonging to the Silurian system, but 

 did not state their position in the series.' Professor Jukes, in his various 

 papers, considered the " Dingle Beds " to be connected with the Upper 

 Silurians ; and in the Geological Survey maps, published under his direction^ 

 they are provisionally placed above the fossiliferous Ludlow rocks." 

 Professor Hull regards the " Dingle Beds " as being above the Ludlow rocks, 

 and the highest portion of the Upper Silurian series.^ John Kelly, in his 

 paper on the " Greywacke Eoeks of Ireland," gives an account of the " Dingle 

 Beds," and puts them among the Upper Silurians ; but he did not state in 

 which particular division he would locate them.* The late G. H. Kinahan, 

 M.R.I.A., in his paper read at a Scientific Meeting of the Eoyal Dublin Society, 



I Journal Geol. Soc. of Dublin, vol. ii, p. 28 (1843) ; vol. viii, p. 2 (185S). 

 ^ Journal Eoyal Geol. Soc. of Ireland, vol. i, p. 105 (1867). 

 ^ Quarterly Journal Geol. Soc., vol. xxxv, pp. 669-723 (1879). 

 * Journal Geol. Soc. of Dublin, vol. vii, pp. 270-290 (1860). 

 K.I, A. PKOC, vol.. XXIX., SECT. 13. [2 K] 



