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HUTTONIAN THEORY. 



201 



179. The laft of the fads juft mentioned is 

 curiouflj commented on by Mr Kirwan. As he 

 has proved, he fays, that the mountains higher 

 than 8500 feet were all formed before the crea- 

 tion of fifh, it follows, that the fhells found at 

 Guanca- Velica, mull have been carried there by 



the deluge* 



No 



ithout objecting to th 



proof here referred to, (though it feems very open 

 to objcdion), it is fufficient to remark, that, if the 

 fnells at Guanca- Velica were carried there by the 

 deluge, or any other caufe that operated after the 

 formation of the rock of which the mountain 

 confifts, they can make no part of that rock, but 

 muft lie, like other adventitious foflils, loofe and 

 detached on the furface, or at moll externally 

 agglutinated to the Hone. This, however, is 

 certainly not the fadl ; for, in the account jull 

 quoted, we read, that Don UUoa told M. le Gen- 

 til, " qu'il avoit detache ces coquilles d'un banc 



fort 



epais 



" This feems plainly to indicate, 

 that the (hells w^ere included in a bed of rock. 

 But, granting that the expreffion is a little 

 ambiguous, on turning to the Memoir es Phi- 

 lofophiques of the fame author, the difficulty is 

 completely removed, and it is made evident, that 



1 



thefe fhells are in fad 



rock. 



integrant parts of the 



" On voit dans ces montagnes-la, (about 



Guanca- 



» 



Geol. ElTays, p. 54, 



f 



