MO GEOGNOSY OF EAST LOTHIAN. 



structure of individual strata, and also in masses of 

 strata ; and hence incline us to consider many of 

 them as original varieties of structure, and there- 

 fore not produced by the action of any after me- 

 chanical cause. These various structures of the 

 sandstone, afford interesting views in regard to the 

 formation of strata in general ; and are particularly 

 valuable, as illustrating the connection of sandstone, 

 in a chemical point of view, with quartz-rock and 

 granite. 



From Canty Bay, the cliffs along the shore be- 

 come lower, and are often covered with sand. The 

 rocks of which they are composed, are principally 

 trap-tuff, which contains cotemporaneous masses 

 and veins of basalt, or basaltic greenstone. Rather 

 more than half a mile from North Berwick, and a 

 short distance from the shore, there is a quarry of 

 that kind of limestone named Stinkstone, which is 

 wrought to a considerable extent, and burnt into 

 lime. It appears to form a great bed in the red sand- 

 stone. From the quarry, which is named Rhodes 5 

 Quarry, to North Berwick, the prevailing rocks, both 

 on the shore, and in the country, are red sandstone, 

 and red tuff, containing beds and imbedded masses 

 of a basaltic greenstone. The rock at the harbour of 

 North Berwick is amygdaloid. Immediately to the 

 westward of the harbour, the amygdaloid is succeeded 

 by a sandy beach, in which a few ledges of red sand- 

 stone and red tuff are to be observed. These ledges 

 are succeeded by beds of compact greenstone, seve- 



