334 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 7, 



dip were steady for the whole distance. Possibly 900 feet would 

 not be far from the real thickness. 



Proceeding up the Cork and Midleton trough to the westward, 

 the next most instructive section will be one drawn north and south 

 through Carrickshane, near the town of Midleton, to the Old Eed 

 Sandstone hills on the north. 



Fig. 6. — /Section across Bilberry Hill. 



B. Eoxborough 



House. BUberry Hill. 



dl c 



Length of Section, 3^ miles, 



{d'^. Thick-bedded grey limestone with fossils. 

 d^. Dark- grey slates with white and brown sand- 

 stones. 

 c. Old Eed Sandstone Eed slates with red and brown sandstones. 



The thickness of the slates here is not exactly determinable, as 

 the exposures are few and scattered, and one of them gives a dip of 

 10° to the north, indicating an anticlinal curve. The quarries and 

 cuttings, however, which were opened at Bilberry Hill in the year 

 1851, when the late Edward Forbes visited this locality with me, 

 were crowded with the little eases of Crustacea which were then 

 called Cypris, since Cypridina, and are now known as Leperditia. 

 Forbes was greatly struck with these " Cypris-slates," as we then 

 called them, comparing them with those known on the continent as 

 Gypridina-schiefer. 



The width of the tract at Bilberry Hill, in which grey and blue 

 slates and brownish and whitish sandstones are interposed between 

 the massive Carboniferous Limestones and the bright-red slates and 

 red and green sandstones of the Old Red Sandstone, is about a mile 

 and a half, but reference to our maps will show that there is a fault 

 as well as a curve in this tract. A list of the fossils collected in the 

 Carboniferous Limestone near Midleton, and those found in the grey 

 slates and grits of Bilberry Hill, drawn up by Mr. Baily, will be 

 found in the Explanation to sheet 187 of the Irish maps. The 

 limestone fossils include more than seventy species of Corals, Shells, 

 &c., such as are most abundant throughout the Carboniferous Lime- 

 stone of the British Islands. The fossils from the slates are fewer, 

 and I will therefore quote the list here : — Fenestella antiqua, Orthis 

 Michelini, Producta Martini, Bhynchonella pleurodon, Spirifera li- 

 neata, S. striata, 8. VerneuiUii (or disju7icta, with the variety called 

 Mosquensis), Aviculopecten nexilis, Cypricardia Phillipsii, Modiola 

 MacAdami, Orthoceras undulatum, Leperditia (^Cypridina) suhrecta. 



The black slates and dark-grey grits strike steadily along the 

 south side of the Old Red Sandstone ridge from Bilberry Hill, through 

 the city of Cork, and on to Cookstown, everywhere dipping south at 



