78 Mr. Bryce on the Geological Structure of 



of GlenarifF-glenj the lias which extends almost without interruption from 

 Lame, again appears from beneath masses of fallen rocks, which strew the 

 whole space between the shore and the cliffs : the only stratum visible is the 

 slate clay ; no limestone having been detected. The thickness of the deposit is 

 here greater than on any other part of the coast, except at the little deer park 

 of Glenarm ; but it cannot be accurately determined. The slate clay is well 

 seen on the road-side, a little west of Cloch-a-stukan ; and the soft sub- 

 stratum having given way, the road has sunk considerably. It terminates 

 before entering Glenariff, the mulatto from this point resting on the sand- 

 stone, until near Ballintoy at the extreme north-western corner of the district, 

 where the lias reappears. 



Mulatto or Green Sand. 



(21.) Dr. Berger noticed, that the upper beds of this rock are of a homo- 

 geneous sandstone, while the lower frequently include quartz pebbles, and 

 thus assume the conglomerate structure. These two varieties are constant in 

 their character and relative position, from the Point of Garron to the eastern 

 flank of Lurgeidan Mountain ; where the sandstone thins out, and the mulatto 

 for the remainder of its range is a conglomerate. Under this form it con- 

 tinues its course between the chalk and the newer red conglomerate as far as 

 the eastern part of Teabuliadh, where it ultimately disappears, extending some 

 distance beyond the termination of the red conglomerate, and thus reposing on 

 the mica slate. From the point where the mulatto sandstone ends, the mulatto 

 conglomerate begins to contain fragments of mica slate in addition to the 

 quartz pebbles, which alone had entered into its composition before; and they 

 become much more numerous from the point where it begins to repose upon 

 the new red conglomerate. It never contains the red granite found in the 

 conglomerate ; but fragments of a white carbonate of lime, like an indurated 

 chalk, are not unfrequent. It is difficult to say whence this limestone was 

 derived. 



The existence of beds of mulatto near Armoy, on the western edge of 

 the district, seems indicated by loose masses strewing the surface ; but as 

 no section is exposed, the mulatto, on this part of the map, is marked as 

 doubtful. 



Where the stratum is fully developed, in the first part of its course, its thickness varies from 

 six to ten feet, the conglomerate bed forming about one third of the whole. In the latter part of 

 its range, where the brecciated bed alone occurs, the thickness varies from nine inches to three 

 feet. 



