248 



ft. in. 



Brought forward, . 250 0 



11. Coal, bituminous (Goodman's vein), . . . . 2 6 



12. Black shale, 600 0 



13. Coal, carbonaceous, uninflammable, . . . . 2 6 



14. Black shale, passing into flinty slate, . . . . 2 0 



15. Trap, second columnar range, . . . 70 0 



16. Black shale, . . . . . . . . 2 0 



17. Coal, non-flaming, alternating with thin beds of black 



shale, . . ... ' ; . . . . 8 6 



18. Black shale, thickness unknown, the face of cliff being 



covered by a talus of fragments of rock of various 



kinds, say, ... . . . . . . . 10 0 



437 6 



In this part is red sandstone, black shale, and both bituminous and 

 non-flaming coal. To sum up, yellow or white sandstone is the pre- 

 vailing rock in the Ballycastle cliffs, with bituminous coal. At Mur- 

 logh Bay, black shale and red sandstone prevail, with thin beds of 

 both bituminous and non-flaming coal. It is evident, on comparison, 

 that the coal measures at the two localities are not equivalents. From 

 the black shale, the red sandstone, and the non-flaming coal to the 

 east of Fair Head, it appears to me that the eastern part of the district 

 about Fair Head is the lower zone of the two I have been comparing, 

 and that the part west of the Carrickmore dyke belongs to a higher 

 portion of the group, which has been thrown down at this place, by a 

 fault, some hundreds of feet in depth. 



There are other proofs that the strata westward from Ballycastle 

 have been thrown down from the position they occupied in the geolo- 

 gical succession. In Murlogh Bay is to be seen near the mica slate 

 on the shore, a conglomerate, very similar to that of the Devonian 

 brown grit at Cushendun, and which I believe to be its equivalent. In 

 Ireland, black shale is the prevailing rock at the bottom of the coal 

 measures everywhere. In Murlogh Bay, as usual, it prevails below. The 

 rock over it is red sandstone of the coal-measures, which is also of com- 

 mon occurrence in the coal measures of Scotland. Over all these coal- 

 measures, in Murlogh Bay is seen new red sandstone and chalk, at 800 

 feet high in the cliff, and in part covered by the greenstone of Fair- 

 Head (PL XXVI.).- The group of collieries to the west of Carrickmore 

 dyke appears to have been thrown down from the Fair Head coal-mea- 

 sures ; and the western head of this dyke corroborates this view. The Salt 

 Pans colliery, from its coal being different from the rest in the number 

 and thickness of the beds, but above all from the hade of the clay dyke 

 which forms its eastern boundary, appears to be thrown down still far- 

 ther ; and last of all, the chalk, the unmistakeable index of the country, 

 on the shore at Ballycastle at, and in parts under sea level, is 800 feet 

 lower than it is, where it lies over the coal measures at Murlogh Bay. 

 All these circumstances hold out more than a probability that the coal 



