2M GEOGNOSY OF EAST LOTHIAN. 



and often appear as mountain masses in the stra- 

 ta, and terminating in the rock at the extremi- 

 ties a fact which leads us to infer, that the quartz 

 hills are large cotemporaneous masses contained in 

 the strata, not resting over them. 



We have now stated examples of trap rising 

 through sandstone, and forming small eminences ; 

 of hard sandstone rising through soft, giving rise 

 to large projecting masses ; and, lastly, we have 

 shewn, that quartz is arranged in a similar man- 

 ner in the older rocks. 



These facts lead me to suppose, that North Ber- 

 wick Law does not overly the sandstone, but rather 

 rises through it, and may be the upper part of a 

 great imbedded mass. 



