20 Mr. Weaver on the Geological Relations of the South of Ireland. 



apparently passes under the sea to Corkabeg-, terminating there in a low 

 promontory, which extends from the mainland on the eastern side of the 

 lower harbour, being situated to the north of Carlisle Fort. The clayslate, 

 interlaminated with the limestone both on the northern and southern sides of 

 Rinniskiddy hill, contains the same organic remains as the latter rock, and the 

 series of strata deserves strict examination from those, whose local residence 

 may afford the requisite leisure and opportunity. The fossils I met with 

 Avere mostly indistinct. All these rocks dip conformably to the south. 



(31.) In the ranges of clayslate hills which occupy the district on the south 

 of the limestone of the vale of Cloyne, is an isolated but parallel band of lime- 

 stone, situated about half a mile south of that of the Cloyne valley. It ranges 

 in a dell from east to west nearly two miles, being about one eighth of a mile 

 in thickness ; and, as exposed in the principal quarries of Carrigacrump and 

 Ballyfin, its strata appear on the northern side, dipping 70° to the south, cor- 

 responding in that respect with the adjacent clayslate on the north ; but in 

 proceeding south the limestone approaches to the vertical position. 



(32.) I have yet to notice two small isolated bands of limestone in the grey- 

 wacke and slate series, the one situated at Blarney, north of the river Lee, 

 the other adjacent to that river and south of Macroom. 



At Blarney the limestone forms a ridge of slight elevation, about two miles 

 in length, ranging east and west, in strata apparently nearly vertical. Blarney 

 Castle is situated about midway between the two extremities of the ridge, 

 which becomes narrow toward the east, but widens toward the west ; its 

 greatest width being nearly half a mile. The red slate and greywacke rocks 

 which bound this limestone on the north and south, approach the vertical po- 

 sition, yet with a prevailing dip toward the south, though the northerly dip 

 also occurs. High, hilly ground, about two miles wide, intervenes between 

 the Blarney limestone and the river Lee. 



The band of limestone south of Macroom, stretches along the right bank of 

 the river Lee to an extent of two miles, but in its progress west it crosses that 

 river, proceeding about half a mile further. It nowhere appears to exceed 

 half a mile in width, and its general position may be considered as vertical, the 

 slaty and greywacke rocks by which it is bounded, being on the south either 

 vertical, or inclined north, and on the north inclined south, yet nearly vertical; 

 while still more north and south the dip becomes interchangeable, high angles 

 in these cases always prevailing. In the hills flanking this limestone, and also 

 in the defiles which lead toward the Castlemore limestone in the valley of the 

 Bride (§. 29), maybe observed many varieties of greywacke, quartz-rock, and 

 slate, of varying shades of blue, green, brown, red, and grey. 



