the North-eastern Part of the County of Antrim. 79 



In Farous-glen, on the south side of Glenariff, in the bed of a river which 

 exposes a vertical section, the red sandstone is succeeded by a bed of blue 

 argillaceous marl two or three feet thick, similar to that, which, in most places, 

 forms the upper member of the sandstone series. On this marl the mulatto 

 conglomerate rests, and is interstratified with a few thin seams of tlie ar- 

 gillaceous marl. That part of the marl which is interstratified with the 

 mulatto, and the overlying portion to the thickness of six inches, contain 

 very few pebbles; while the superior portion includes them in great numbers. 

 In the north-east face of Lurgeidan Mountain, veins of mulatto, not exceeding- 

 two inches in thickness, pass irregularly to the depth of from five to fourteen 

 inches through the upper beds of the new red sandstone, which are here a fine 

 red sand. The sandstone between the seams is charged with calcareous 

 grains; and the regular stratum of mulatto conglomerate, which is here about 

 one foot thick, is arenaceous in its lower part. This may be regarded as 

 a rudimentary formation of the lower greensand, which attains a full develop- 

 ment in other places, beyond the limits of our district. Both these instances 

 of interstratification, are unexampled among the upper secondary deposits of 

 the North of Ireland. 



A brecciated mulatto inclosing quartz pebbles only, and about three feet 

 thick, underlies the chalk in Murlogh Bay, terminating against the mica slate 

 in the south-western corner of the bay. 



Chalk. 



(22.) The chalk having ranged round the sides and across the lands of all the glens from 

 the Point of Garron to Teabuliadh, continues its course in a north-west direction, along the 

 eastern declivity of the principal chain, then turning round the northern front of Bencruachan, 

 takes a southerly direction along the western escarpment as far as Corkey. Here, after a short 

 sweep to the west, it turns again northward, and continues in that direction by Ballyknock, 

 Armoy, and Balleeny, to Ballycastle, where turning again westward, it forms the coast by 

 Kenbane and Ballintoy towards the Causeway. In the interior of the country, the chalk con- 

 stitutes part of the four isolated hills, Knocklayd, Ballypatrick, Carnanmore, and Mullach-fin- 

 ooar, all ranging in a north and south direction, and lying in the same parallel of latitude. In the 

 three former it is covered by a thick cap of trap ; but in the latter it is uncovered. 



It is also uncovered by trap in the northern part of Carnanmore, and extends thence in a zone 

 of considerable breadth through Coolnagoppoge and Ballynean, to the cliffs above Murlogh, 

 where it abuts abruptly against the greenstone of the Fairhead. 



This zone presents the greatest surface of chalk uncovered by trap in the North of Ireland ; 

 and it is here only that the peculiar vegetation of the chalk is exhibited. The soil is a light dry 

 mould, covered by an intensely green turf, which is bespangled with myriads of daisies. 



(23.) We have seen, that the upper beds of new red sandstone in Glenarift' 

 pass into an argillaceous marl, which, however, does not contain any veins of 



