of Deny and Antrim. 203 



course, the strata preserving the same order, and the same 

 characteristic marks. Or whether these strata, appearing on 

 the summit of Slievegallon, be the commencement of a 

 new arrangement, abandoned by nature as soon as begun : 

 which is highly improbable, for neither limestone nor basalt' 

 are to be found on the mountain except in this solitary 

 hummock. 



We might, by a minute attention to the inclinations and 

 arrangements of the strata contiguous to the other inter- 

 ruptions I have enumerated, prove in like manner that the 

 basaltic masses crowning the summits of the surrounding 

 hills and mountains, are merely the remnants of strata once 

 extensive and continuous, but interrupted and carried off, as 

 in the preceding case, by the same powerful agent. 



The more diminutive inequalities scattered over the whole 

 surface of our area, and always produced by interruptions of 

 the strata, would still more easily admit the application of 

 the same reasoning, from the contiguity of their abrupt ed 

 parts ; but the detail would be tedious ; those who wish to 

 pursue the subject further must come to the scene them- 

 selves. 



Materials completely carried off. 

 A circumstance perhaps still more extraordinary, is the 

 complete removal of all the materials that once filled up the 

 intervals between the abrupted parts of these strata. I have 

 stated in my 9th fact, that the materials that had formerly 

 composed the projecting parts of our northern facades and 

 precipices, had totally disappeared. 



The removed parts of the limestone stratum on the west 

 side of our area have shared the same fate, for where the 

 chain of mountains extending from Mugilligun Rock to 

 Bienbraddocky is interrupted by valleys at Slradreagh, Drum- 

 rommer, and Ballyness, it is obvious that the limestone stra- 

 tum was once continuous to the high points where it shows, 

 itself on Ready, and the mountains on each side; its thick- 

 ness too, wherever we can try it, is very great ; vet this 

 stratum, which in its entire state must have spread like a 

 roof far above the present surface of these valleys (which are 



now 



