50 Scientific Proceedings, Royal Dublin Society. 



ditions were favourable for its being deposited, such as shallow 

 bogs and the like. In connexion with these outliers of Carboni- 

 ferous Limestone "Lower Limestone Shale," in situ, has been 

 observed in places, but in others no trace of it can be seen, and 

 apparently it is altogether absent, the limestone lying directly 

 on the older rocks. 



The rocks in the valley of the Lee, would seem to suggest a 

 solution of the difl&culty at present felt in reference to the differ- 

 ence in the arrangement of the rocks north and south of the pre- 

 viously mentioned irregular line between Kenmare and Passage 

 West (Cork Harbour), as hereabout the newer rocks evidently 

 were deposited in a valley margined with high cliffs of " Glen- 

 garirf Grits " (Jukes) ; but the rocks in the Kenmare valley are so 

 peculiar that before offering an opinion on them they would 

 require a very careful examination. 



In the vicinity of Cork Harbour, is the locality of the hinge 

 line, between the depression and elevation where the rocks of 

 the Central Ireland type, and of the Cork type, meet and inter- 

 mingle. Consequently from Cork Harbour eastward to the sea 

 near Dungarvan, the rocks in the sections may be of either types, 

 or of the two types mixed up together, while in places they seem 

 to lie unconformably on the " Glengariff Grits " (Jukes). 



The "Glengariff Grits" also seem to be changing eastward, and 

 I suspect that the rocks of the Commeragh mountains (conglo- 

 merates, &c.), although lithologically different, yet eventually will 

 be found to be the littoral accumulations of the " Glengariff Grits " 

 (Jukes). 



