1800.] JAMIESON DEIFT, ABERDEENSHIRE. 359 



sence of transported boulders on mountain-tops at still higher levels, 

 favour the supposition of a sea-loch having been the receptacle. I 

 searched in vain for traces of Mollusca to decide this interesting 

 question. Descending the glen, I found that, after reaching the 

 lower extremity of the long narrow meadow, mounds again made 

 their appearance; and a section of one of these near Deny shooting- 

 lodge disclosed coarse stratified gravel containing well-rounded peb- 

 bles of granite. This second set of hillocks may be conceived to 

 have arisen by the arm of the sea having retreated to near this point, 

 when the stream from above would again commence to pour in its 

 gravel and debris. 



No striated or glacially marked stones occurred to me in these 

 mounds of Glen Derry, not one, although I searched anxiously 

 for them, — a circumstance that bears strongly against the theory of 

 their being glacier-moraines. 



It would be tedious to describe these things in the other glens of 

 this district ; suffice it to say that similar accumulations, evidently 

 deposited from water, are of general occurrence in like situations in 

 the various ravines of Braemar, up to the flanks of the central mem- 

 bers of the great granite mountains of the Ben Muic Dhni group. I 

 do not, however, mean to say that there are not also traces of glacier- 

 moraines. 



In Perthshire I examined some sections of the drift deserving 

 special notice. Of these the most important was on the flank of a 

 hill called Meal TJaine, about 2095 feet high, on the east side of the 

 valley of the Tummel, just below Killiecrankie. It was remarkable 

 for snowing the immense thickness and height that the drift had 

 attained in that quarter, as well as for the vast amount of denudation 

 it has undergone. 



Fig. 8. — Vieiv of a Banlc of Drift on Meal Uaine. 



I. House of Fascally. 2. Bank of Drift. 3. Ordnance station. 4. Top of Meal Uainc. 



The channel of the Tnmme] opposite this section is at an altitude, 

 probably, of about '2'.n\ feet above the preaenl sea-level ; and on the base 

 of the hill, for about 300 feel above this, the drift has been almost 

 entirely swept away, little remaining on tho surface of tin- rocks 

 save a few patches of water-rolled gravel of more recenl origin ; so 

 that we do not reach the foot of the section in question until we are 

 at an elevation of about 600 feet above the sea, and 300 feel above 



