126 The Irish Naturalist. December, 



which the author deals with in the text, and of these the gorge north 

 of The Bush station is probably the most important. 



Regarding the view, put forward in Figure 12 of the paper, that the 

 general direction of movement of the Scottish ice across the Mourne 

 Mountains and across the lowlands of Mourne around Kilkeel was from 

 north to south or south-east, a word of criticism may be made. That 

 the lowlands of Mourne are cumbered with immense Glacial deposits of 

 boulders, gravel, sand and clay, derived from the mountains to the north, 

 cannot be gainsaid, and these deposits may have been incorporated in 

 the Scottish ice as it moved southwards across the Mourne Mountains, 

 and may afterwards have been deposited in the lowlands. But an earlier 

 invasion of the lowlands of Mourne by Scottish or Irish Sea ice is evidenced 

 by the occurrence of a basal boulder-clay, with marine shells, around 

 Kilkeel, and in the valley of the White Water. In this basal boulder- 

 clay, and in derived gravels, the reviewer, in recent inonths, found marine 

 shells in great abundance, in many cases in an excellent state of 

 preservation, and up to the present fifteen species have been obtained, 

 including the usual proportion of arctic and northern forms. This 

 investigation into the distribution of the shelly drift is being carried 

 out with the aid of a government grant in the gift of the Royal Society 

 of London, and Major Dwerryhouse's paper had already been completed 

 when the work in the lowlands of Mourne was commenced during 1923. 

 The facts which have been stated point to the conclusion that when the 

 Scottish ice rounded the eastern slopes of the Mourne Mountains near 

 Annalong, it moved inland and south-westward across the lowlands of 

 Mourne, laying down the basal boulder-clay with its marine shells. That 

 the Scottish ice moved inland from the direction of the Irish Sea, across 

 the lowlands of Carlingford, and the country south of Dundalk, is also 

 the opinion of the reviewer, although an examination of the Glacial 

 deposits of Cooley has, up to the present, yielded no satisfactory evidence 

 of the presence of shelly boulder-clay similar to that found in the Kilkeel 

 lowlands. 



But the paper must be read in its entirety to be fully appreciated, 

 as there is a great amount of valuable detail which cannot be summarized. 

 We may congratulate Major Dwerryhouse on the publication of a very 

 notable contribution to the study of the Glacial geology of Ireland. 



J. DE W. HiNCH. 



