continued to the top of Gunnerby Hill, 

 but which, however, must no doubt con- 

 sist in great part of some kind of stone ; 

 for it could not otherwise rise so much 

 as it does in so short a space, viz 70 or 

 80 yards perpendicular, I apprehend, in 

 the distance of a little more than a mile. 

 There is likewise another set of strata 

 which form another ridge of lower hills, 

 three or four miles nearer this way, about 

 Foston ; all these probably contain several 

 beds of clay and under these are found the 

 Lyas, which consists of a great many 

 alternate beds of clay and blue limestone. 

 I believe I have formerly mentioned 

 it to yourself and Dr Blagden, but not 

 recollecting whether I have before insisted 

 so much upon it, as I might have done, 

 I shall take this opportunity, which the 

 country I have just been mentioning 

 suggests, of observing, that to the west- 

 ward of all that edge of Dr Blagden's 

 yellow limestone, next our side of the 



consist of what are now known as the Upper, Middle 

 and Lower Lias.] 



55 



