A few miles farther, the stone, though to 

 appearance much the same, was found to 

 be of a siliceous nature, with very little 

 calcareous matter in it. At Lyme the cliffs 

 are blue clay and blue Lyas ; but the top 

 of the hill, which we pass over imme- 

 diately before we come to Lyme, consists 

 of gravel composed of this chert ; and 

 about a mile to the west of Lyme was a 

 hill with a steep bank towards the sea, 

 the foot of which was blue Lyas with 

 yellow limestone over it, mixed with 

 veins of this chert, so much like limestone 

 that one could hardly distinguish them 

 by the eye ; but it must be observed that 

 this, as well as most of the limestone we 

 saw, is of a hard compact and rather brown 

 kind. 



From hence to Sidmouth the soil con- 

 sisted chiefly of this cherty gravel, but the 

 cliffs on each side of Sidmouth consisted 

 of red rock (the sandy kind consisting of 

 thick strata) ; only on the east side they 

 were covered with a great thickness of 



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