LIFE of Dr HUTTON. 71 



countries, is fo covered by the foil, as to be vifible in very 

 few places. In the autumn of this fame year, however, Dr 

 Hutton had an opportunity of obferving another inftance of it 

 in the bank of the river Jedd, about a mile above the town of 

 Jedburgh. The fchiflus there is micaceous, in vertical plates, 

 running from eaft to weft, though fomewhat undulated. Over 

 thefe is extended a body of red fandftone, in beds nearly hori- 

 zontal, having interpofed between it and the vertical flrata a 

 breccia full of fragments of thefe laft. Dr Hutton has given 

 an account of this fpot in the firft volume of his 'Theory of the 

 Earth, p. 432., accompanied with a copper-plate, from a drawing 

 by Mr Clerk. 



In 1788 he made fome other valuable obfervations of the 

 fame kind. The ridge of the Lammer-muir Hills, in the fouth 

 of Scotland, confifts of primary micaceous fchiftus, and extends 

 from St Abb's-head iveftward, till it join the metalliferous 

 mountains about the fources of the Clyde. The fea-coaft af- 

 fords a tranfverfe fection of this alpine tract at its eaftern extre- 

 mity, and exhibits the change from the primary to the fecondary 

 ftrata, both on the fouth and on the north. Dr Hutton wifh- 

 ed particularly to examine the latter of thefe, and on this occa- 

 fion Sir James Hall and I had the pleafure to accompany him. 

 We failed in a boat from Dunglafs, on a day when the finenefs 

 of the weather permitted us to keep clofe to the foot of the 

 rocks which line the fhore in that quarter, directing our 

 courfe fouthwards, in fearch of the termination of the fecond- 

 ary ftrata. We made for a high rocky point or head-land, 

 the Siccar, near which, from our obfervations on fhore, we 

 knew that the object: we were in fearch of was likely to be difco- 

 vered. On landing at this point, we found that we actually 

 ■ trode on the primeval rock, which forms alternately the bafe 

 and the fummit of the prefent land. It is here a micaceous 

 fchiftus, in beds nearly vertical, highly indurated, and ftretch- 



Vol.V.— P.1II. K ins 



