700 PROF. E. HULL ON THE DINGLE BEDS AND 
identified them with the rocks which form the Reeks and Glengariff 
ranges. 
1838. Mr. Thomas Weaver, in a memoir “ On the Geological Re- 
lations of the South of Ireland’’*, described the rocks forming the 
mountains of Cork and Kerry under the old name of “Greywacke 
and slate of the Transition series.” 
1839. Sir Richard Griffith, in presenting his Geological map of 
Ireland to the Geological Society of Dublin, also read a paper on 
the principle of colouring adopted in the above map, and on the 
geological structure of the South of Irelandy, in which he refers to 
the discovery of numerous Silurian fossils in beds in the Dingle 
promontory, notices the discordant superposition of the Old Red 
Sandstone on the clayslate of Dingle, and expresses the opinion that 
‘“‘ eventually the greater part, if not the whole, of the schistose rocks 
of the counties of Cork and Kerry ” will prove to be Silurian. 
1845. Mr. C. W. Hamilton, in a paper ‘“‘On the Rocks in the 
neighbourhood of Killarney as contended, in opposition to Sir R. 
Griffith, that those of the Kallarney and Dingle mountains are not 
Silurian but of Devonian age. - To this paper ‘Sir Richard replied in 
the same year$; and in 1855, in the seconde dition of his geological 
map of Ireland, the beds forming the western portion of the Dingle 
promontory, and the mountainous tracts of Kerry and Cork, are 
coloured and lettered as “ Silurian,” and described as ‘‘ chloritic or 
brownish-grey quartzite or agglomerate, occasionally alternating 
with green and purple slate.” 
1856-7. Prof. Haughton ||, Prof. J. Beete Jukes, and Mr. Salter 4] 
discussed the classification of the Devonian and Carboniferous rocks, 
the latter authors contending for the collocation of the Yellow Sand- 
stone with Knoriia dichotoma, Anodon Jukes, &c. with the upper 
part of the Old Red Sandstone. In 1857, also, Mr. G. V. Du Noyer 
gave a minute description of the rocks of the Killarney district**, 
and assumed the purple and green slates and grits to be of Lower 
Old Red Sandstone age. 
1858. Sir Richard Griffith again took up the question in his 
‘¢ Notes on the Stratigraphical Relations of the Sedimentary Rocks 
of the South of Ireland ” ty, in which he indicates that the base of 
the Old Red Sandstone may be recognized in the Dingle promontory 
with the same unconformity to the underlying rocks as in other 
districts examined, but that the beds with Upper Silurian fossils at 
the extreme west of the promontory pass up directly into the 
“ Glengariff grits ;” and, considering the discordancy between these 
and the Old Red Sandstone, he had no longer any hesitation in re- 
garding the Glengariff beds as belonging to the Silurian system. 
These opinions are supported by Mr. J. Kelly in a paper “On the 
Graywacke Rocks of Ireland as compared with those of England ” ++. 
* Trans. Geol. Soc. 2nd ser. vol. v. (1840). 
+ Journ. Geol. Soc. Dubl. vol. ii. p. 78 (1848). 
t Lbid. vol. iii. p. 134 (1845). § Lbid. vol. iii. p. 150. 
i Thid. vol. vi. p. 227 (1856). §| Lbid. vol. vii. p. 63 (1857). 
** Thid, yol. vii. p. 97. tt Ibid. vol. viii. p. 2 (1858). 
tt Lbed, vol. viii. p. 251 (1858). 
