D. MACKINTOSH ON HIGH-LEVEL MARINE DRIFTS. 



367 



to remark that though rounded stones in drift may often be seen in 

 brook-channels and on roadsides, where the ground is flat, I have 

 not examined any hillock or small mound which did not show signs 

 of its being composed of rounded gravel and sand. Besides the four 

 hillocks with gravel-pits (in one of which I found shell-fragments) 

 near Mountain Lodge, during my last visit I counted ten which 

 evidently consisted of drifts similar to deposits on our present sea- 

 coasts. North of a brook which joins another brook near Erwau, 

 I saw three rather low mounds with surface-excavations sufficient 

 to show that they consisted of rounded gravel and stratified sand. 

 The furthest north of the mounds was quite 1300 feet above the 

 sea-level. While continuing my journey in a northerly direction, 

 I saw many well-rounded stones in drift exposed in a brook-channel 

 about 1350 feet above the sea. On descending towards a house 

 called Braich (1031 feet above the sea, as I have been informed by 



Fig, 3. — Section of Drift-deposits between Braich and the Summit 

 of the Ridge, Frondeg, Denbighshire. (The levels, with the 

 exception of the lowest and highest, are approximate.) 



the Director of the Ordnance Survey), I encountered a knoll (fig. 3) 

 about 1250 feet, showing the marks of a now disused gravel-pit, 

 containing many rounded stones and sand. The shelly gravel-pit 

 (described in the paper) lies between the above knoll and Braich. 

 North of the latter there are three gravel hillocks between 

 1100 feet and 1150 feet. West of the house called Cae-mynydd 

 there is a rather large hillock showing the remains of old gravel- 

 pits. West and N.W. of it there are several large mounds (the 

 highest nearly 1400 feet above the sea), the character of which is 

 doubtful ; but in one of them several small excavations show a 

 mixture of rounded and angular gravel. A similar kind of drift 

 may be traced nearly to the north end of the mountain. I had pre- 

 viously seen Eskdale granite only in the shape of small pebbles ; 

 but on this occasion I stumbled on two large blocks, one N.W. of 

 Cae-mynydd, and the other associated with numerous millstone- 

 grit blocks on the summit of the axial ridge (about a mile west of 



