232 Correspondence — Professor E. Hull. 



and refers to the Vale of Eden, South Wales, and other distant areas 

 in connection with the Vale of Clwyd. In my paper, however, 

 I relied on the same system of faulting in South- West Lancashire 

 and West Cheshire — about Liverpool and Birkenhead — where there 

 are many such north-and-south faults, dislocating the Trias, and 

 varying from a throw of a few up to 1,000 and even 2,000 feet,'^ 

 equal to any in the Vale of Clwyd and all indisputably of post- 

 Triassic age. This area is only 25 miles fi-om the Vale, so that the 

 conclusion is irresistible that the faults in both areas were produced 

 at the same time. The post-Triassic faults in South- West Lancashire 

 and West Cheshire are as great dislocations as those which traverse 

 the Coal-measures in the country to the east, the only difference being 

 that the Trias has been denuded from off the older strata, after the 

 faulting had been completed. 



With the exception of the Carboniferous Limestone, there are few 

 really important exposures in the Vale of Clwyd, and most of thera 

 afford considerable scope for the use of the imagination, and it is 

 surprising when anyone has a theory to uphold how facts ci'op up 

 to support it. I have my theory, and appear to see faults where 

 Mr. Strahan does not, while he thinks he can see evidences of 

 the Trias overlapping the Carboniferous Limestone and perhaps 

 the Wenlock Shale where I do not. It seems to me that it is the 

 absence of good sections that is the cause of the difficulty. 



I have been indebted to Mr. Strahan for much information, and 

 for the position of exposures which, however, I always examined for 

 myself, while on the other hand I constantly informed him of the 

 progress of my work in many areas in North Wales. No geologist 

 is a more careful observer than Mr. Strahan, and I much regret that 

 he left the Vale of Clwyd before I began to examine it about seven 

 years ago. Still, he has only completed a portion of it, so that when 

 he has finished there may be little difference of opinion between us. 



G. H. Morton. 

 Liverpool, March 20, 1899. 



THE EASTERN MAEGIN OF THE NORTH ATLANTIC BASIN. 



Sir, — Will you allow me briefly to reply to the communications 

 from Admiral Sir William Wharton and Mr. Hudleston which 

 appear in the April number of the GtEOLOGIoal Magazine, so far 

 as they concern myself. 



Presuming from the context that the question to which Admiral 

 Wharton was invited to reply refers to some supposed statement of 

 mine, I have to say that I am not aware of ever having asserted that 

 there are " submarine vertical precipices 7,000 feet or so in height," 

 and, therefore, as far as regards anything I have written 1 might 

 leave the matter to others. But I can scarcely conceal from myself 

 that the words have been put into my mouth, and I have reason to 

 complain that no reference is given to which I can refer. I have, 

 it is true, called the sub-oceanic ' slope,' along which the Continental 



' The boundary fault (2,000 feet) has the Trias only on the downthrow side, but 

 before the country was denuded the Triassic strata were on both sides. 



