to the Mineral Structure of the South of Ireland. 169 



The contact of the conglomerate with the transition slate is 

 clearly visible at Island Hubbock, about a quarter of a mile 

 north of Ballyvoil Head, and their unconformability is un- 

 questionable, as the conglomerate rests upon the upturned 

 ends of the slate, and strongly adheres to them. In illustra- 

 tion of this fact, I beg to refer to the section No. 1, which 

 gives an accurate representation of the red slate and conglo- 

 merate strata as they occur, resting unconformably on the 

 dark gray transition slate, from Island Hubbock westwards. 

 The succession is as follows : 



1. Unconformable base composed of alternations of black- 

 ish gray and reddish-gray clayslate with chlorite slate and 

 gray quartz-rock, the blackish-gray clayslate greatly predomi- 

 nating; dip of strata from 10° to 20° east of north, at angles 

 varying from 60° to 75°. 



2. Alternations of reddish-gray and red conglomerate, red- 

 dish-gray compact sandstone, and dark-red slate, the conglo- 

 merate predominating ; dip of strata about 35° west of south, 

 at angles varying from 60° to 80°. The thickness of these 

 alternating strata is about 300 feet. 



3. Dark reddish-gray clayslate, reddish-gray quartz-rock, 

 and sandstone, the slate predominating : thickness about 300 

 feet. 



4. Dark red micaceous sandstone, and red clayslate, with 

 occasional beds of conglomerate, the sandstone predomina- 

 ting; dip 25° west of south at angles varying from 60° to 85° : 

 thickness about 750 feet. 



5. Dark-red slate, red quartz-rock and sandstone, the slate 

 predominating : thickness about 300 feet. 



6. Brownish-red quartzose rock, red clayslate, and yellow- 

 ish-gray sandstone, the sandstones predominating: dip 20° 

 west of south, on an average at an angle of 65°: thickness 

 about 600 feet. 



To the south of the yellowish-gray sandstone and red slate 

 the strata are concealed from view by diluvial matter for a 

 distance of about half a mile, beyond which alternations of 

 dark-gray carboniferous slate and limestone are visible, both 

 of which contain abundance of fossils belonging to the carbo- 

 niferous limestone series. 



I also give a section of the strata as they occur, from the 

 unconformable contact of the red slate and conglomerate with 

 the transition slate at Gloundolgan, to the coast at Ballyna- 

 courty in the harbour of Dungarvan, in which the succession 

 of the strata between the lower conglomeritic base, the yellow 

 sandstone, the carboniferous slate, and superincumbent car- 

 boniferous limestone are clearly shown. 



Now if we compare these sections with that originally 



