314 



five-sided. Others have four or six sides. They are remarkably so- 

 norous, giving out a metallic sound when struck with a hammer. 



In the Island of Pathlin, the rocks are chalk and trap, similar to 

 what those rocks are on the northern shore of Antrim, west of Bally- 

 castle. There are groups of columns in that island, too, hut as they re- 

 semble those on the main land, I shall merely enumerate the localities. 



1. At Kenrammer (the fat Head), there are seven rows of pillars, one 

 over the other in succession, all nearly vertical, but none very regular ; 

 some were interlaced and mixed with others. 



2. At Thi-vigh (the side point), there is a sort of headland sloping 

 down to the sea ; it is covered with grass, but the section sideways 

 exhibits two assemblages of square pillars not unlike those of Pair 

 Head. The lower part of this group is formed of pillars the largest in 

 dimensions ; the upper ones those that are the best defined. 



3. Rue na Scarce, in the townland of Craigmacagan, presents another 

 projecting joint of land, with a real causeway, in neatness hardly inferior 

 to the Giant's Causeway itself; the pillars being almost vertical; the 

 pavement is nearly horizontal. 



4. At Doon Point the rock is said to be tabular basalt, but I have 

 seen a painting made of curved columns at that place, which was of a 

 unique character. It was painted by Mr. George Davis, for Mr. Grif- 

 fith's lectures, and was many years in the Royal Dublin Society. 



5. JN~earUshet Haven, on the south-east side of a hill, named Broagh 

 mor na hoosid, there is a very elegant causeway. It is 460 yards long 

 in a north-east direction, mounting over the top of the hill. The pillars 

 are five and six-sided ; the largest are from three feet to two feet eight 

 inches in diameter. 



Dislocations on the North Coast. 



The northern coast of Antrim is much dislocated, but there is a 

 peculiar facility of tracing the extent of the blocks into which it is 

 divided by means of the white chalk abutting against, or covered by the 

 black basalt at the junctions, which can be seen for miles distant ; also 

 the trap, which is columnar, is easily separated by the eye from that 

 which is not, and in this way every block on the coast can be dis- 

 tinguished. These blocks are mostly separated from each other by 

 vertical joints or cracks : whether these great cracks were produced at 

 the time of the upheaval of the land or not, we do not know. The chalk 

 on the shore for the most part affects a level position ; some of the blocks 

 are pushed up higher than others. To show this more satisfactorily, I 

 give approximate measurements of the alternate divisions of chalk and 

 trap as they appear on the shore, and the length of each block in miles 

 and furlongs. 



Miles. Furlgs. 



Prom Portrush to the white rocks, is a sandy beach, 



probably resting on chalk, . . . . 1 

 1 . Chalk cliffs to the barrack wall, west of Dunluce 



Castle, 1 0| 



