48 Scientific Proceedings, Royal Dublin Society. 



to be more or less unconformable to one another, while in the 

 latter all the strata should form a continuous sequence, and in 

 the straits connecting the two sea areas, various complications 

 partaking of the nature of the two different systems of accumu- 

 lations might be represented. 



Let it be supposed that a similar state of things to that now 

 o-oing on in the Scandinavian seas gradually had been in existence 

 in the area now represented by Cork and the adjoining portions of 

 Xerry and Waterford. First, the rocks now represented by those 

 called by Jukes "Glengariff Grits,"* were accumulated over a large 

 area. Second, along an irregular line from Dingle Bay to Kenmare, 

 and thence to and beyond West Passage, Cork, a mass of country 

 beo"an to rise, and in connexion with it a spur of country extend- 

 ing from this line at Mangerton eastward for some distance. 

 Third, in the area southward of the rising tract last mentioned the 

 ground was stationary or gradually sinking so as to allow successive 

 strata to accumulate on it ; while northward of the rising ground, 

 the land had already been rising before the accumulation of any 

 new strata. Fourth, south of the irregular line the accumulations 

 formed a continuous sequence, while northward of it including 

 the tracts north and south of the spur of land extending east- 

 ward from Mangerton, the newer accumulations would lie more 

 or less unconformably on the older. Fifth, east of about the 

 lono-itude, of Cork, at the hinge line where the elevation 

 adjoined the depression, there would be considerable complica- 

 tions, the accumulation of the two types being mixed and dove- 

 tailing into one another. 



If the above suggestions are correct, northward of the line of 

 rise, the newer rocks of the central Ireland Carboniferous type, 

 ouo-ht to lie unconformably on the older in the following localities, 

 viz., in the vicinity of Dingle Bay, at KiUarney lakes, in the 

 valley of the Flesk and Blackwater, at Kenmare, and in the 

 valley of the Lee at Macroom, Coachford, Innishcarra, Blarney, 

 and Passage West. 



The localities just mentioned, beginning to the northward, 

 o-ive the following : — In the promontory of Dingle the Upper or 



* It is necessary, for the sake of distinction, to connect Jukes' name with this group of 

 rocks, as Prof. Hull has given a nearly similar name to a more extensive group of -which 

 these rocks form but a part. 



