Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/215

 wards the south and east. This valley is principally occupied by the red sandstone, which, in those directions terminates against the mica slate, forming the base of Knocklead (the round-backed mountain seen in the distance) and extending thus far in continuation of the primitive district already described in Cushleak. Between 4 and 500 feet on the ascent of this mountain, a bed of primitive limestone may be traced. Above this, through an interval of about 400 feet, the strata have not been ascertained; but probably the red sandstone, and perhaps also the lias and mulattoe, may be found in this space, since the chalk appears at the elevation of between 8 and 900 feet; and the whole is crowned by a cap of basalt, 980 feet in thickness.

On the eastern side of Ballycastle bay, the basalt rises into low cliffs, and the substratum of chalk emerges from the level of the sea, but soon sinks again. In this interval the vein of wacke and compact limestone, described by Dr. Berger, page 172, occurs; from hence to Kenbaan there is nothing that requires particular attention.