230 GEOGNOSY OF EAST LOTHIAN. 



quarried as a building- stone. The direction of the 

 strata is still S. W. and N. E., and dip to the south ; 

 but, as we proceed south-eastward, the strata be- 

 come more inclined ; at length are nearly vertical, 

 and are succeeded by a bed of porphyritic basaltic 

 greenstone. The red sandstone does not appear 

 beyond this point, its place being now occupied by 

 a greyish-white sandstone, which is disposed in 

 nearly horizontal strata, and contains beds of lime- 

 stone. The lower strata of sandstone are calcareous, 

 contain vegetable and animal impressions, and in- 

 clude large cotemporaneous masses of bluish-grey 

 compact splintery limestone. This limestone de- 

 cays yellow. In the sandstone there are numerous 

 supposed vegetable moulds, and some varieties of 

 the sandstone are entirely composed of these. This 

 latter fact would intimate, that these are crystalli- 

 zations of the sandstone, and not true casts of orga- 

 nic bodies.— Such are the rocks that occur imme- 

 diately to the south and south-east of the harbour. 



Let us next describe those that extend from the 

 north-west side of the harbour. Immediately under 

 the ironshot porphyritic greenstone pillars, already 

 described, a bed of red-coloured trap-tuff is to be ob- 

 served, having the same direction as the bed of trap 

 in which the harbour is situated, and, like it, dip- 

 ping to the south-east. It rests on strata of sand- 

 stone, which have the same dip and direction. 



The sandstone in some places is of a red colour, 

 but it is more frequently grey, spotted with red. It 



