22S 



GEOGNOSY OF EAST LOTHIAN. 



limestone, slate-clay, red-coloured clay-ironstone, 

 greenstone, amygdaloid, basalt, trap-tuff, and clink- 

 stone. 



A comprehensive view of the relations' of the 

 rocks of this formation to each other, will be obtain- 

 ed by attending to the following description of the 

 strata, as they occur along the coast of the county, 

 from the neighbourhood of Dunbar to the westward 

 of North Berwick. 



Rocks in the Neighbourhood of Dunbar, and on- 

 wards to the Westward of North-Berwick. 



The harbour of Dunbar is situated in a red co- 

 loured trap rock, which forms a single bed of very 

 considerable thickness, whose direction is N. E. and 

 S. W. and dip to the S. E. This rock, which is an 

 iron-shot porphyritic greenstone, is beautifully co- 

 lumnar, and the structure is well seen all around 

 the harbour, but particularly on the north-west side. 

 From the harbour, a low rocky coast extends to the 

 eastward ; but, to the north-west, the coast is higher 

 and more rugged. If we proceed along the shore 

 from the harbour, towards the south, the first rock 

 we meet with is a red conglomerated sandstone, 

 which is immediately under Mr Hay's manufactory. 

 It extends N. E. and S. W. ; and, like the trap of 

 the harbour, dips to the S. E. It is succeeded by a 

 bed of red coloured trap tuffa, having the same di- 

 rection and dip. The next bed is a conglomerated- 

 like sandstone. It is of a reddish colour, and im- 



