in the Middle Begion of Scotland. 



175 



to indicate tbat the grooving agent was deflected from its 

 original course. In the district generally, the uniformity of 

 direction being so great, a mei-e list of the localities is nearly 

 all that is requisite. 



Arrow No. 15. On the west shoulder of Demyat, three 

 miles from Stirling, 500 feet above the sea, direction ESE. 



16. At Torwood, four miles NW. from Falkii^k, arrow 16, 

 direction ESE., observed by Sir J. Hall. In this and the 

 preceding, the bearing of the striae corresponds with that of 

 the upper part of the Frith of Forth, and with the remark- 

 able furrows on the rock of Stirling Castle, of which the 

 figure below is a rough sketch, borrowed from the " Sketch 

 of the Geology of Fife and the Lothians." 



Fig. 5. 



This rock forms an isolated hill, rising 300 feet, at S, 

 above the plain which surrounds it. The highest part is an 

 escarpment of trap, a, b, c, d, e, fronting the north-west. The 

 furrow, or rather ravine, dividing the ridge a, from the ridge 

 6, is about 60 feet deep, and sharply cut. The others, be- 

 tween b and c, c and d, d and e, are from 15 to 40 feet, and 

 they all point north-westward. The coincidence in bearing 

 of these furrows with the striae on Demyat, 3 miles northward, 

 and with the others at Torwood (arrow 16) is interesting. 



17. On trap, one mile south from Borrowstounness, about 

 150 or 200 feet above tlie sea. 



