526 



Corres2)ondence — Professor W. H. Hohhs. 



Southward the gravel thins out, until at a distance of 470 feet from 

 the old cliff the section is only 1 foot thick. The bed consists of 

 pebbles for the greater part, sandstones, porphyrj', etc., of the 

 neighbourhood. They are all well-rounded and water-worn. The 

 flints are old chalk flints, usually broken and angular in form, 

 occasionally flaked as if broken by impact with other stones, and 

 sometimes red in colour. Their presence here seems to indicate the 

 existence, somewhere in the bed of the North Sea, of Cretaceous 

 deposits, probably derived from the Chalk formation which appears 

 to have at one time existed in the North of Scotland, and of which 

 the rounded, water- worn flints of Aberdeen are remains.^ 



R. G. A. BULLERWELL, B.Sc. 

 Balgonie House, 



Maddison Stkeet, Blyth. 

 September 18, 1908. 



A RECENT VISIT TO GLEN ROY, BY AN AMERICAN GEOLOGIST. 



Sib, — In June last it was the writer's good fortune to visit Glen 

 Roy with the excellent paper by Jamieson in his hand (Quart. Journ. 

 Geol. Soc, 1892, vol. xlviii, pp. 5-37). It is a pleasure to confirm 

 from observation the correctness of the conclusions reached by the 

 author. It seems to the writer, however, that thei'e are indications in 

 the valley of a later chapter of glacial history, which, from enquiries, 

 it is inferred has not yet been worked out, if it has indeed been noted. 

 The object of this communication is to draw attention to the more 

 clearly revealed facts in order that others who are nearer the locality 

 may search for additional indications of this glacial episode. 



The great glacial dam at the south base of Bohuntine Hill is clearly 

 a terminal moraine laid down at the margin of the ice which proceeded 

 from the Ben Nevis centre and impounded the drainage of the glen to 

 produce one of the local lakes. There is, however, another heavy 

 morainal obstruction in Glen Roy, situated just above the entrance to 

 Glen Glaster, which affords the clearest evidence that the glacier 



' [See the following: — (1) "On the Cretaceous Fossils from the Drift of 

 Moreseat, Aberdeen," by G. Sharman & E. T. Newton, Geol. Mag., 1896, 

 pp. 247-54, giving a list of fifty-three species belonging to the Lower Greensand, 

 Gault, Upper Greensand, and to the Upper and Lower Chalk. (2) A second paper 

 also in this Magazine for 1898, pp. 21-32, by A. J. Jukes-Browne & John Milne, 

 giving a list of fifty- nine species, all from the Speeton Clay, Lower Greensand, 

 Gault, and Upper Greensand, but none from the Chalk. — Ed. Geol. Mag.] 



