130 GEOLOGY OF THE LOTHIANS. 



agglutinated by the infusion of the felspar ; and in other 

 parts masses of the shale are bent up amongst the felspar, 

 and made to assume the form of a vein ; the structure is 

 also completely changed, inasmuch as the perfectly fissile 

 slate-clay assumes a hardness which, in some parts, is little 

 inferior to that of Lydian stone. (Plate XV. Fig 2.) 



Alexander's Craig, which forms a high trap range near this, 

 is composed of irregular alternations of tufa and amygdaloid, 

 surmounted by a range of an imperfectly prismatic basalt, 

 which reposes on thin strata of slate-clay, ironstone, and 

 sandstone ; in one part it is in immediate contact with a bed 

 of coal, a portion of which is entangled in the basalt and 

 completely charred. Veins of fibrous calcareous spar abound, 

 traversing both the tufa and the strata. From Alexander's 

 Craig to Pettycur, the rocks are entirely composed of amyg- 

 daloid with tufa, in which numerous variously sized masses 

 of slate are imbedded. Calcareous spar occurs in great 

 quantities, forming large veins and amygdaloidal masses in 

 the greenstone, and is in some places associated with groups 

 of amethyst and quartz crystals. On the shore at Petty- 

 cur, the amygdaloid reposes immediately on much indu- 

 rated strata of mountain limestone; and, at one point, both 

 rocks have been shifted for several feet. Superimposed 

 on the amygdaloid which lies on the limestone, there rests a 

 thin series of ironstone and shale strata, above which amyg- 

 daloid again occurs. Immediately below the inn of Petty- 

 cur, there begins an alternating series of sandstone, time- 

 stone, shale, basalt, amygdaloid, greenstone, tufa, and wacke; 

 all these rocks dip to the east, and continue with little inter- 

 ruption till within a short distance of Kirkaldy. Though 

 the alternations of the neptunian and plutonic rocks are so 

 numerous, still there are only a few places where their con- 

 nections exhibit any thing interesting, and with a detail of 





