^a2 



ILLUSTRATIONS OF THEl 



Guanca-Velica, and particularly at that in whicii 



the quicklilver 



petrifi 



), des coquilles entieres 



nfermees au milieu de la roche 



i 



que les eaux de pluie mettent a decouvert 



quilles font corps avec la pierre 



Ces 



mais malg 



remarque que la partie qui fut coquille 



fe dillingue par la 



lite de la matiere de tout 



la ftrudure, la qua- 

 LUtre corps pierreux 



qui I'enferme, et du maffif qui s'efl fixe entre 



les deux 



& 



He 



g 



on 



to fay 



that one can dillinguifh marks of thefe fhells 

 having been worn, before they were included in 

 the ftone. 



80. Thus it appears, that whatev 



proof 



any foffil-lhell affords, that the rock in which 



it is found was formed 



der the fea. the 



r' 



fame is afforded by the foffiLfhells of G 

 ca-Velica ; and we are. 



titled to 



we are, therefore, perfedlly en- 

 ide, that the relative level of 

 the fea and land has changed, fince the forma- 

 tion of the latter, by more than 14000 feet. 

 The height alTumed in § 37. is therefore much 

 under the truth ; and the water, for which the 

 Neptunifts mud provide room in fubterraneous 

 caverns, might very well have been dated at 



more 



* 



Mem.. PhiIofophi(jue3 de Don Ulloa, Difcours 



