172 Proceedings of the Royal Irish Academy. 



Mils of boulder clay resting on limestone. These islands are peculiarly 

 shaped, being generally oval, with their longest axes runningin an east and 

 west direction, the most western of them haying their face on the sea side 

 cut away by the encroachments of the sea, and presenting vertical cliffs." 



Memoir Geological Survey of Ireland (Sheets 93 and 94 and adjoin- 

 ing portions of Sheets 83, 84, and 103), 1878, The area described is 

 "bounded on the west by the Atlantic Ocean, on the north by the 

 Atlantic and KiUery Harbom-, on the south by the Ocean. 



^p_ 8.) — " The Atlantic Ocean, which bounds so much of this area, 

 indents its coast by fiords, bays, and creeks, some of which are of 

 considerable size and length. The largest and most marked of the 

 fiords are KiUery Harbour and Streamstown Bay. The first is over 

 nine miles long, and seldom, except near the east termination, over 

 half a mile across ; while Streamstown Bay is nearly five miles long, 

 and for the most part only a few hundred yards wide." 



(p. 11.) — " The central ridge ends towards the west at Inishturk, 

 in a height of 120 feet, while the northern branch immediately west of 

 Aughrustbeg Lough is only 78 feet high ; nevertheless farther west, 

 and apparently one of the partly submerged peaks of this ridge, is 

 Ai-dillaun or High Island, with an altitude of 208 feet. 



"Bordering the Atlantic Ocean on the north, and partly parallel 

 with the northern branch of the east and west ridge just now described, 

 is a low range of hills that towards the north-west ends in the cape 

 called Cleggan Head. North-west of this is Inishbofin, and possibly it 

 may be part of this ridge ; however, more probably it is part of a more 

 northern ridge (Revyte Promontory)." 



(p. 13.) — " Besides the mountains now described there are isolated 

 hills forming conspicuous and striking objects, such as Lettermore 

 {^ the hig slope,^ 1172), forming the promontory north of Ballynakill 

 Harbour; Lackairea, ^ the tangled flags,'' 1307 feet above the sea, 

 standing over and abruptly rising from Maum Bay, and in a quarter of 

 a mile gaining a height of 1279 feet)." 



(p. 14.) — " Islands. — Lying off the west and south coasts, also in 

 some of the bays, are large and small islands, and sea rocks. ( Carrig 

 and Carry geen). The islands off the north part of the west coast are 

 apparently peaks of the submerged parts of ridges as previously 

 suggested, being situated on lines having a similar bearing to the 

 parts of the ridges on the mainland, i.e. nearly east and west lines. 

 Southward of Mannin Bay and off the south coast, other arrange- 

 ments seem to exist ; and the islands, if they are parts of ridges, belong 



