282 



river on the north, equal to this amount in three and a-half miles, a 

 further proof that the limestone has sunk at Glenarm. The amount of 

 the downthrow on the east side of Glenarm valley is at least 350 feet. 



Proceeding northward, in the next valley, there appears to be a 

 similar fault to that last mentioned, and running in a parallel direction, 

 that is south-west, but the limestone in this valley is not buried in the 

 fault as at Glenarm. In the townland of Gortcarry, on the north-west 

 side, the limestone stands at about 450 feet; in the townland of Bay, on 

 the south-east, it is about 109 feet, so that there is at this fault a 

 downthrow to the south-east of 350 feet also, the same as at Glenarm. 



Travelling from Glenarm to Carnlough, the limestone, which crops 

 out near the road, is cut through by a great mass of trap, which 

 emerges from the sea, and no doubt once came from the depths below. 

 The mass continues from this place to the south-west, and forms the 

 basaltic mountain of Munies, which separates the valley of Glenarm 

 from that of Carnlough. The place occupied by this basalt between 

 the two chalks is 235 yards in width along the road. It was the great 

 vent through which the mountain was erupted. Its west edge is at 

 the one milestone; a furlong out to sea opposite to it is the Black 

 Rock, a basaltic hummock 20 feet high and 60 diameter, apparently 

 part of a continuation of the same mass to the north-east into the sea. 

 I would call particular attention to this fact, because it shows that a 

 whole mountain mass has been protruded from one fissure. Many such 

 fissures there may be, no doubt, in the interior of the country. I have 

 not, however, seen any like this near Belfast, where the whin dykes 

 appear to prevail as vents. 



14. Gortin, half a mile west of Carnlough village, is four miles 

 north-west of Glenarm, No. 13. The limestone from Ballygilbert, No. 

 12, up to this and forward, is a true outcrop, and the slips which I 

 have shown to exist at Glenarm and Carnlough valleys indicate that 

 there are others in this region. There is probably one or more parallel 

 to the coast here, a short distance out at sea, by which the chalk is 

 thrown down and buried in the sea, at a mile, or perhaps a furlong out. 

 The soundings along close to the shore, on charts, show a depth of 10 

 to 20 fathoms. 



15. Slate House is introduced here merely for the purpose of 

 getting the thickness of the trap on Nachore Mountain. 



16. Garron Point is four miles north of Gortin, No. 14. Here 

 there are several large masses of both limestone and basaltic rock which 

 have slipped down from the adjacent precipices to the shore. The 

 vicinity of this place abounds with the wildest forms of rocky scenery, 

 steep precipices, deep dells, and towering pointed crags. The outcrop 

 of the limestone continues declining regularly from No. 14 to No. 15, 

 as seen by the Table. The greensand here is about 10 feet thick.* 



* This Point iu the country appears to have pot its name from the sea-going people, 

 who passed by; they thought that a mass of white limestone in the face of the cliff re- 

 presented a white horse. This picture would have been called Gear-ran — hence Garron 

 Point. 



