NOIJTH BERWICK-LAW. 241 



ral fathoms thick, in which the direction is N. E. 

 and S. W. The greenstone is sometimes amygda- 

 loidal, and the amygdaloidal portions are of calca- 

 reous spar. Strata of white sandstone and of clink- 

 stone follow the greenstone ; and these are succeeded 

 by a great bed of porphyritic greenstone. These 

 various greenstone-beds are observed running into 

 the sea, and rising above its surface in different 

 parts, forming the rocks named Craig Leith, and 

 the Lamb. 



North Berwick-Law. 



Immediately above the town of North Berwick, 

 rises the beautiful conical hill named North-Ber- 

 wick-Law, whose summit is 500 feet above the 

 level of the sea. The district around the hill is 

 low, and slightly undulated, so that it forms a 

 striking and very beautiful object to the surround- 

 ing country. The lowest rock visible, is a variety of 

 trap-tuff. Higher up, is amygdaloid. The middle 

 and upper parts of the hill are of a beautiful and 

 very sonorous variety of clinkstone-porphyry ; and 

 the summit rock is clinkstone-porphyry, intermixed 

 with crystals of augite ; thus forming a transition 

 into greenstone *. The clinkstone is, in some 



* Vide Dr Ogilvy's interesting observations in his Paper on 

 the Trap Formation of East Lothian, vol. i. p. 469. Wern- 

 Mem. 



VOL. III. Q 



