13 



author of these memoranda ; and a case at Ulverston, noticed by 

 Professor Phillips, but not yet described by him ; all of which 

 were under a drift covering, and as perfect and finely shown as 

 any case yet noticed in Switzerland.* The shores of Loch Lomond, 

 however, exhibit tolerable examples. At Rowerdennan Inn, between 

 the house and shore, there is a good example of striation and 

 rounded rocks. The surfaces are remarkably worn, rounded and pol- 

 ished; and the striation about parallel to the axis of the lake. Other 

 cases of striation occur in many places along the shores. Mr. James 

 Thomson, civil engineer, now of Belfast, lately noticed a good case 

 on sandstone rocks, about three miles from Glasgow, south-east of the 

 road between Auldhouse and Thornliebank, Pollokshaws, and due 

 south of the manse near Auldhouse ; the direction was here oblique 

 to the road, or running nearly west. Captain Brickenden has de- 

 scribed f striations on the rock of Dumbarton Castle, 150 feet 

 above the river, in the fissure intersecting the rock from north to 

 south. The surface of the sandstones on Craigmaddic moor is 

 striated in many places, the direction being nearly E. and W. ; and 

 the trap rocks forming the high ridge between Strathblaiie and 

 Milngavie are similarly marked, in a direction declining a little S. 

 of E. ; while they exhibit also rounded and bossy surfaces in great 

 perfection. Fine examples may be seen in Corrie Glen, about one 

 mile west of Kilsyth. Here a vast accumulation of detrital matter 

 with travelled boulders is exhibited in a natural section on the 

 banks of the West burn, as shown in the annexed cut. 



(a a) River bank of detritus, with travelled and striated boulders; (b b) great intruded coulee of 

 basaltic rock, enclosing (c) a shale bed, altered to the state of a coarse opal. 



The south bank rises to the height of about 80 feet, and is 

 entirely composed of detritus, partly local and partly derived from 

 rocks existing only in situ to the westward. The most remarkable 



* Phil. Mag., Dec. 1850; and Brit. Assoc. Rep., 1850. 

 f Journ. Geol. Soc., vol. xi. (1855). 



