326 [B.N.F.C. 



layers of basalt capped by boulder clay in the less-exposed face 

 of the great Magheramorne Quarry. 



At Cloughfin, immediately north of Black Head, we have 

 boulder clay resting on Trias about 50 feet above the open 

 sea, and, as might be expected, we have a very varied series of 

 erratics, including slate from Ballachulish, felsite from the 

 Clyde, Cushendun, and Torr rocks, Ailsa rock, syenite from 

 Slieve Gallion, ironstone nodules from Lough Neagh, granite 

 from Slieve Croob, and three fragments of the porphyry dyke 

 at Bloody Bridge, near Newcastle, nearly 50 miles south of 

 Cloughfin. 



Just inside the mouth of Belfast Lough, near Whitehead, 

 we find an interesting difference in the list of erratics at 

 Cloghanport ; this deposit is only 4 or 5 miles from Cloughfin, 

 but is much more limited in range. No rocks from south or west 

 occur, Ailsa, Torr Head, and Cushendun furnishing the most 

 distant boulders. Amongst the 339 erratics listed, 24 were from 

 Ailsa Craig. We may group Ballyholme, near Bangor, with 

 these two- seaside localities, and note abundant pebbles of Ailsa 

 and eight undoubtedly Scotch rocks, including a Silurian shale 

 from Girvan, containing a fossil trilobite. 



Retracing our steps inland to a group about Lough Neagh, with 

 Drumsough IX. (near Cookstown Junction) and Cranfield Point, 

 X., on its north, the glacial gravels of Antrim,, XL, and Glenavy 

 and Crumlin, XVII., on its eastern shore, we still find erratics 

 from Cantyre, the Clyde, Cushendun, and Slieve Gallion, adding 

 granites from. Pomeroy in Co. Tyrone, as we descend eastward 

 to Woodburn Glens, XII., anl arrive at Greenisland, where our 

 survey first commenced its labours with such a surprising list 

 of travelled rocks. 



Once more we ascend the basaltic plateau, search- 

 ing, at Mr. Wright's request, for the highest attainable 

 boulder clays, visiting the great quarry behind Carnmoney 

 Church, and extracting with difficulty the boulders un- 

 usually firmly bedded in the clay. Here we came upon chert, 

 carboniferous limestones, and shales that have probably 

 travelled 40 miles across the plateau from the Ballycastle coal- 



