of Devonshire and Cornwall. 105 



Plymouth, by Dartmouth, Torbay, andTeignmouth. I am mclined 

 to beUeve that it is the same limestone which I saw at Chudleigh 

 and Ashburton, and which extends thus far into the interior of the 

 country. The observations of Dr. Maton seem to support this con- 

 jecture,* as do those subsequently made by Lord Webb Seymour and 

 Mr. Playfair.f 



Nor do I know what rocks are found in situ, on the road from 

 ' Exeter to Oakhampton. I can only say, that at a few miles to the 

 east of that town, the extensive grauwacke formation commences. 



Before proceeding further westward, where more constant and 

 uniform formations will be found to exist, it may not be amiss to 

 make here some general remarks, pointed out by the subject itself, 

 on the nature and succession of the different formations which have 

 been already noticed, and on what they seem to offer in the way of 

 analogy with other countries. 



It has been seen, that leaving on the borders of Dorsetshire the 

 chalk and flint formation, and afterwards the shell limestone, a red 

 sandstone succeeded, in strata slightly incHned, which as well as 

 those of the conglomerate into which it passes, rest in some places 

 on amygdaloid, in others on grauwacke, and finally on transition 

 limestone. It is an object of inquiry which demanded more leisure 

 than I was able to bestow upon it, to determine whether it is on one 

 of these rocks in particular, that the argillaceous sandstone rests : 

 but it is, I presume, a matter of secondary importance. There is 

 another general fact of some consequence to observe, which is, the 

 elevation of the strata the further they proceed to the westward, and 

 the great angle of inclination they make with the horizon. Let us 



* Observations on the Western Counties, toI. i. p. 1'22. 

 + Illustrations of the Huttonian Theory, p. 55, 189. 



