Mr. Warburton on Shell-Mark. 309 



with copper, intersect this rock. From the northern edge of the 

 loch rises a considerable hill, called Pitscanellie hill, composed en- 

 tirely of grit-stone, whose different beds, alternating with a coarse 

 breccia, furnish stones for slating, paving, mill-stones, and rubble 

 work. From the south side of the loch rises a hill of freestone, 

 whose summit is covered by whin. This bed of whin is of no 

 great breadth, and extends about two miles in length, from one 

 end of the ridge to the other. If we may guess from this de- 

 scription, the prevailing rock seems to be the red sandstone, so 

 common in this island ; it is in basins formed in this rock that the 

 shell marie is found in the vicinity of Kelso. 



Vol. iv. 2 r 



