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HUTTONIAN THEORY. 



375 



336. The fame remarks may be made on the 

 high plain of Blackdown, which the road pafTes 

 over in going from Exeter to the wellward. The 

 flints there are difleminated over the furface as 

 thickly as in the other inftance, and can be ex- 

 plained only on the fame fuppofition. 



Again, in the interior of England, beginning 

 from about Worcefter and Birmingham, and 

 proceeding north-eafl through Warwickftiire^ 

 Leicefterfhire, Nottinghamfliire, as far as the 

 fouth of Yorklhire, a particular fpecies of high- 

 indurated gravel, formed of granulated 

 quartz, is found every where in great abun- 

 dance. This fame gravel extends to the well 

 and north-weft, as far as Afhburn in Der- 



byfhire, , and perhaps ftill farther to the north. 

 The quantity of it about Birmingham is very 

 remarkable, as well as in many other pla- 

 ; and the phenomenon is the more fur- 

 priling, that no rock of the fame fort is. feen in 

 its native place. It is fuch gravel as might be 

 cxpefted in a mountainous country, in Scotland^ 

 for inftance, or in Switzerland, but not at all iit 

 the fertile and fecondary plains of England. 



This enigma is explained, however, when it 

 is obferved, that the balis of the whole trad 

 juft defcribed is a red fandftone, often contain- 

 ing in it a hard quartzy gravel, perfedly fimilar 



to that which has juft been mentioned. From 



ces 



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