Messrs Peach and Home on the Glaciation of Caithness. 345 



house of Dirlot to Dalemore, a distance of nearly a mile. 

 Its height varies from 20 to 30 feet.* 



From Dirlot westwards to Strathmore Lodge conical mounds 

 and ridges rest on the plain of grey shelly boulder clay. 

 They are not abundant, however, occurring only at intervals, 

 and chiefly on the left bank of the stream. From this point 

 to Dalnawillan Lodge, which is about eight miles up the 

 strath from Dirlot, similar heaps can be traced. Towards 

 the latter locality they become more numerous, and on the 

 left side of the valley at Dalnawillan they are well developed. 

 Here the moraines form huge mounds and ridges, excellent 

 sections of which are exposed by the roadside and in the 

 burn courses. 



It is observable that the material gradually changes its 

 character as we ascend the valley, for while towards the 

 eastern limit it is sandy and gravelly, with distinct stratifi- 

 cation, it becomes more compact, and the stones are not so 

 well rounded near the head of the strath. Indeed, it ap- 

 proaches the type of moraine matter which is commonly met 

 with in upland valleys. We are inclined to believe that the 

 kamiform ridges near Dirlot mark the easterly extension of 

 the later glaciers, for it is highly improbable that they are 

 of marine origin, when no trace of similar deposits has been 

 observed between this locality and the eastern seaboard. On 

 the other hand, the fact that the mounds can be traced at 

 intervals from Dirlot to Dalnawillan, where the material 

 resembles ordinary moraine matter, indicates a probable con- 

 nection between the different deposits. 



The evidence suj^plied by these later accumulations is 

 important, because they rest both on the reddish-brown 

 boulder clay and the grey shelly drift. They steal across 

 the surface of the shelly drift for a distance of three miles 

 between Strathmore Lodge and Dalemore, so that there can 

 be no doubt that the shelly drift is of older date than the 

 deposits under consideration. This is the only locality where 

 we found the shelly boulder clay overlaid by gravel ridci-es 

 and moraines; indeed, so far as our observations went, 



* These gravel ridges were noticed by Dick in his rambles. Sec Quart. 

 Jour. Geol. Soc, vol. xxii., p. 270. 



