ERRATIC BLOCKS OF THE BRITISH ISLES. 105 



60 basalt, 22 sandstone, 18 schist, 12 quartz, 10 porphyry, 6 granitic 

 rock, 1 jasper, 1 syenite, 3 Permian, 1 lignite, 9 chalk and flint, 2 grit, 

 1 felsite, 1 gneiss, 1 quartzite. The subjacent rock is Carboniferous 

 limestone. The prevailing directions of the parent rocks are N. or 

 N.E. ; two are N.W. 



Foraminifera found in the clay. 



Armagh (Esker S.W. of Carrick-a-loughran Quarry). — 100 pebbles 

 noted, 35 per cent, were erratics, and included 24 basalt, 6 mica schist, 

 4 quartzite, 1 flint. A fragment of Balanus was also found. The 

 clayey sands yielded foraminifera. 



Ailsa Craig Eiebeckite-eurite, petrified wood from Lough Neagh, 

 and foliated gneiss have also been recorded from the Armagh Drift. 



Co. Tyrone. 



Cookstown (Quarry and railway cutting). — About 240 feet above 

 sea-level. Subjacent rock, Carboniferous limestone. 112 boulders 

 noted, 25 per cent, erratics, comprising 8 basalt and dolerite, 1 granite, 

 3 felstone, 1 aphanite, 11 quartz, 2 quartzite, 1 schist, 2 grit. Pre- 

 vailing direction of parent rocks N. or N.E. ; one granite, probably from 

 S.W. Foraminifera found in the clay. 



Co. Down. 



Annadale and Messrs. Martin's Brickyards (on right bank of Lagan). 

 Cliffs about 40 feet high of stiff stratified reddish-brown boulder 

 clay. Subjacent rock is Trias. Erratics noted — a large number of 

 basalt and chalk, also 9 Ailsa Craig Eiebeckite-eurite, 2 rhyolite 

 (Templepatrick), 3 eurite (Tornamoney), 3 schist, 3 gneiss, 1 gabbro, 



1 Carboniferous limestone, 2 greensand, 2 chert, 1 granite, 1 Silurian 

 shale, 1 White Lias (Larne), 2 Carboniferous sandstone (Ballycastle), 

 3 Lias, 1 Felsite, 4 Magnesian limestone. 



Cretaceous and Lias fossils were noted. The sand intercalated in 

 the boulder clay yielded foraminifera. 



Co. Antrim. 



Lisburn. — Esker; subjacent rock Trias. Erratics comprised basalt, 

 granite, porphyry, porphyrite, clay ironstone, grit, conglomerate, 

 quartzite. Prevalent direction of parent rocks N. and N.E. ; one 

 from N.W. 



Ballymena District. — Eskers at Drumfane and Broughshane. Sub- 

 jacent rock, basalt. Boulders at both places mostly of local origin. 

 Out of 100 noted at Drumfane, 70 were basalt, 21 rhyolite, 4 chalk, 



2 flint, 2 dolerite, and 1 Cushendall porphyry. Out of 100 noted at 

 Broughshane, 76 were basalt, 4 flint, and 20 chalk. 



Co. Londonderry. 



Coleraine : Carthall Brickworks. — Boulder clay and sand at one 

 pit in vertical bands. Subjacent rock, basalt, very few boulders, 

 these included erratics of chalk, flint, slate, and porphyry. The sand 

 was examined and yielded foraminifera. 



