848 MINERALOGY OF ARRAJT. 



, other stratnlae, which, though good iron stone, seem to 



contain a proportion of clay, and do not feel so heavy. 



Used for mark- The people here call this ironstone keel, and use it for 



ep ' marking their sheep, and various other purposes. It has 



a greasy feel, and gives a stain to the hands, which it is 



difficult to wash off. 



The farm of Cock is on a steep bank projected from 

 the side of the mountain. The soil is mostly of a blood- 

 red colour, and is composed of the debris of the schistus, 

 and of the ironstone which it includes. It is wholly en- 

 cumbered with this ironstone. Where burns had made 

 excavations, I traced these ironstone strata to the summit 

 of the mountain. 

 Imbedded in What is most extraordinary, great quantities of this iron- 



peat orfthe stone are found, imbedded in clay, beloAV peat bogs, on 

 summit of the the flat summit of the mountain. This clearly shows that 

 mountain. ^he summ jt wa s formerly covered by strata of red schistus, 

 including ironstone, which have mouldered down. Much 

 of the clay may have been washed away, leaving the iron- 

 stone, which water could not easily carry from a flat 

 surface. 



Blood-red lime- Connected with the latter, are several strata of limestone, 



stone. ' " 



of a florid brick, or blood-red colour. Such limestone 



always occurs, where hasmatitical strata present themselves 

 along the coast. We shall therefore take no further 

 notice of this limestone, until we reach Currie, beyond 

 which it was not observed. 

 Jaspidean A stratum about three feet in thickness, and formed 



roar le. j n j. Q jjj^^-g f f rom three to four feet in length, attracts 



attention. This stone contains innumerable shells, chiefly 

 madrepores, some of which exhibit a bright crimson 

 colour. The ground of the stone is somewhat calcareous, 

 and in its fracture every way resembles jasper, of a choco- 

 late colour. It may, not improperly, be called jaspidean 

 marble. Were it polished, it would exhibit a striking ap- 

 pearance. 



Change to Advancing onward, the strata upon the beach are sud- 



isndsUMie. . 



denly changed. White and grey sandstone, with someHmes 



a mixture of yellow, occur, and are continued a great 



way. 



2 In 



