Silurian Rocks of the South of Ireland to those of North Devon. 148 
slightly disturbed prior to their re-submergence in Carboniferous times. It is 
quite possible to have two formations widely separated from each other in point of 
geological time lying actually conformable the one to the other. This may have 
been the case to some extent in the present instance, while at the same time a very 
wide gap and prolonged interval of time actually separates the formations. While, 
therefore, I admit the probability of an actual conformity in some places between 
the Glengariff and newer formations in county Cork, I deny the existence of a 
“ eontinuous succession ” of strata from the former to the later. Parallelism of 
bedding by no means necessarily supposes continuity of deposition. 
Leaving this subject for the present, the question now arises, are there to be 
found in any other district strata which serve to fill up the Miatus described above 
as occurring between the Glengariff Beds and the Old Red Sandstone ? and we 
naturally turn to Devonshire, where (as nearly all geologists are agreed) there is 
found to be an uninterrupted sequence of beds from the lowest Devonian up into 
the Carboniferous formations.* 
V.—North Devon Section. 
This section has very recently been described before this Society by the Rev. 
Professor Haughton,+ and has been the subject of elaborate essays by several 
eminent geologists.{ The late Mr. Lonsdale, while secretary to the Geological 
Society of London, came to the conclusion, that the series of fossils collected by Mr. 
Godwin-Austen and others from the South Devon. limestones constituted a natural 
history group intermediate between those of the Silurian rocks on the one hand and 
of the Carboniferous Limestone on the other. This led to the establishment of 
“the Devonian system,” by Sedgwick and Murchison. 
It would be quite unnecessary for me to attempt a description of the rocks of 
Devonshire after all that has been written on the subject. Ishall, therefore, only 
deal with them in so far as is necessary to establish the correlation of the beds with 
those of the south of Ireland, in a part of which correlation I have been anticipated 
to acertain extent by several writers, especially the late Mr. Salter, Professor Jukes, 
and Dr. Haughton. A great deal, however, still requires to be added in order to 
bring out in its full significance the analogies and differences in the succession of the 
beds in the two countries, which it is the purpose of this paper to elucidate. The 
following comparative section of the strata in the two districts under consideration 
is intended to give the reader a clear idea of their relationships. (See Plate IV.) 
* After a careful consideration of the late Prof. Jukes’ writings, and a personal examination of the 
North Devon section, I am unable to concur in his explanation of that section. 
+ Journ. Roy. Dub. Soc., Vol. IT. (new series), p. 126. 
+ Prof. Sedgwick and Sir R. J. Murchison, Brit. Assoc. Rep. 1836. Sir H. De la Beche, “ Rep. Geol., 
Corn. and Devon and W. Somerset.” Prof. Phillips, ‘‘ Paleoz. Fossils of Corn., Dev. and W. Som.” 
Prof. Jukes, Quart. Journ. Geol. Soc., Vol. XXII., 321. Mr. Salter, Jbcd., Vol. XIX., 474. Mr. 
Etheridge, /bid., Vol. XXIT., 568 ; and Mr. T. Hall, Zb¢d., Vol. XXII, p. 371, &e. 
2B 
