364 MAJOR A. E. DWEB.RTHOUSE ON THE [vol. lxxix, 



grit, flint, red Carboniferous sandstone, gneiss, and Ailsa-Craig* 

 eurite. This is at the southern end of the pit, and the boulder- 

 clay forms a ridge north of which the brick-clays (laminated and 

 without stones) were accumulated in still water. 



About half a mile away to the north, at Drummaquill, Mr. F. W. 

 Egan l mentions the occurrence of gravels containing large numbers 

 of Liassic fossils, including GrypTicea and belemnites. On visiting 

 Drummaquill I found that the gravel-pits are not now so exten- 

 sively worked as formerly ; but I was able to obtain numerous 

 specimens of GrypTicea arcuata, several fragments of Hildoceras 

 bifrons, some Liassic belemnites, as also a specimen of Belemni- 

 tella mucronata from the Chalk. 



The Liassic debris can only have been derived from the neigh- 

 bourhood of Portrush on the north, and this northern origin is 

 borne out by the large masses of chalk and the pebbles of Ailsa 

 Craig eurite in the boulder-clay south of Irish Houses. 



The westernmost part of the coast entering into the area under 

 consideration is that which extends from Castlerock at the mouth 

 of the Bann to Magilligan Strand at the mouth of Lough Poyle. 

 The coastline consists of precipitous cliffs of basalt, with a narrow 

 strip of raised beach running along their foot and carrying the 

 road and railway. 



III. The East Coast oe County Antrim. 



The eastern coastal section of County Antrim will be most con- 

 veniently described in two portions — the first extending southwards 

 from the region just discussed to the ridge of high land running 

 from G-arron Point south-westwards to Elginney Hill, north-east 

 of Ballymena, and culminating in Colin Top (1426 feet) ; the 

 second from that ridge southwards to the line of railway from 

 Antrim on Lough Neagh to Creenisland on Belfast Lough. 



The Northern Area (see map, fig. 3, p. 365). 



A considerable part of the area is above the 1000-foot contour, 

 and this elevated region is deeply trenched by a number of valleys 

 falling eastwards to the sea-coast. These, in succession from the 

 north, are Glendun, Glenaan, Clenballyemon, and Glenariff. There 

 are also the western valleys of the Bush River and Grlenravel, the- 

 latter carrying the light railway from Parkmore to Ballymena. 



The ridge from Agangarrive (1225 feet O.D.) to Crockaneel 

 f 1321 feet) lying north of Grlendun, and that from Crocknacreeva 

 (1092 feet) to Gruig Top (1123 feet), separating Grlendun from 

 Glenaan, consist of the Dalradian schists. 



Cross Slieve, the isolated hill lying on the coast between 

 Cushendun and Cushendall, is of Old Red Sandstone, with con- 

 spicuous beds of conglomerate, a small intrusion of dolerite near 

 Cushendun, and a volcanic neck (Tieveragh) at its southern end. 



1 Mem. Geol. Surv. Ireland, Sheet 13, 1884. 



