234 GEOGNOSY OF EAST LOTHIAN. 



Immediately below Mr Brodie's house, the sandy 

 coast terminates, and the rocks, in the form of cliffs, 

 and of ledges, running into the sea, make their appear- 

 ance. The first rocks are of red coloured trap-tuff, 

 which contains cotemporaneous globular masses of 

 grey compact limestone, and also of a porphyritic 

 variety of tuff. The limestone concretions are from 

 a few inches to 3 feet and upwards in length ; and, 

 at their junction, are frequently intermixed with the 

 tuff. The red tuff is distinctly stratified, and the 

 strata are from a foot to several feet thick. The di- 

 rection of the strata is S. W. and N. E. the dip to 

 the south, and they appear traversed by veins of ba- 

 salt and greenstone. 



The cliffs of tuff, which extend for several hun- 

 dred yards, are succeeded by ledges and low cliffs of 

 sandstone. The sandstone is stratified, and some- 

 times saddle-shaped ; but the direction of the strata 

 is still S. W. and 1ST* E. It is sometimes of a dark- 

 red, sometimes of a bright-red colour. The bright^ 

 red variety is the most highly impregnated with clay, 

 and contains abundance of green circular spots, 

 which appear in some degree to characterize the red 

 sandstone of this formation. It frequently contains 

 globular and tuberose shaped concretions of red-rco- 

 loured limestone. Such cotemporaneous formations, 

 on a great scale, in this and in other rocks, in other 

 districts, appear as mountain masses or even forming 

 hills. Beds of a green-coloured arenaceous clay, al- 

 ternate with the sandstone. This red sandstone is 



