MR MILNE ON THE GEOLOGY OF ROXBURGHSHIRE. 459 



Here are seen to advantage, the effects on the adjacent materials, which, in imme- 

 diate contact, are converted into a very hard and dark-coloured stone, with some 

 crystals and seams of felspar. This quickly changes to a lighter colour, and, at the 

 distance of 5 feet, consists of a red shaley sandstone, approaching to what we call 

 dent, and rapidly crumbling down to red earth, where exposed to the atmosphere. 

 From Glen Quarry to Tofts Hill, the bearing is west ; and from that to Kirkton, 

 west by north. The dyke is seen nearly all the way across the Tofts Hill, which 

 is composed of greywacke, through which the dyke passes nearly at right angles 

 to the direction of the strata. The course of the dyke is jagged and irregular, the 

 irregularities on each side bearing a striking coincidence, and, in some places, 

 especially at Kirkton, when the metal is taken out, if the sides were brought to- 

 gether, it is evident that they would fit exactly. The greywacke does not seem 

 to have undergone much change beyond semifusion and distortion for a very short 

 distance, with now and then some of the matter of the dyke injected into its fis- 

 sures ; width ranging from 10 to 25 or 30 feet. At Kirkton, the dyke (15 feet) 

 suddenly takes a south-west direction, which it maintains whilst in view, about 

 100 yards." 



" From Sunny side, where it is 27 feet wide, the dyke runs, for a few hundred 

 yards, west by north. It is again seen at a short distance, in the bottom of a 

 deep hollow ; and from the last point to this, the course is west, when it changes, 

 and runs for 200 or 300 yards west by south, width 24 feet. The next point, 

 perhaps 260 yards, bears west north-west. Next point, 200 yards, west north- 

 west, 21 feet wide. Next point, 200 yards, west by north, width about 22 feet. 

 From this it bears west a short distance, when it changes to west by north ; in 

 which direction it continues upwards of a quarter of a mile, when it abruptly 

 turns, and runs about 300 yards north north-east ; at least, the next point that 

 I can discover bears in that direction ; and I thought I could make out the angle 

 it formed in changing to north-west by north, in the direction of Miller's Knowes. 

 At Miller's Knowes, the dyke curves from north-west by north to north-west, 

 width from 15 to 18 feet." 



" Here my survey terminates ; but I know that the dyke runs across the com- 

 mon haugh at Hawick, and from the old workings at Miller's Knowes, bears about 

 west by north. It is seen not far to the north of Wilton Lodge, at a point some- 

 where between Whitehaugh and Wilton Burn, a short distance to the north of 

 Mabenlaw and Whitecleughside, and at a point nearly a mile from Borthwick 

 Shiells." 



Mr OLIVER adds, that the general strike of the greywacke strata, is south-west 

 by nest, by true bearings. At the Miller's Knowe, therefore, the dyke which, by 

 true bearings, runs north-nest by north, must cut across these strata at exactly a 

 right angle, just as in the Rink quarry before described. The general course of 

 the dyke, however, is, as already stated and shewn, oblique to the strike of the 



