^2 MINERJLOGICJL DESCRIPTION 



In many parts of the rock I have found concretions, in which 

 there are no bones of any kind ; and on the elevated parts of 

 the mountain, where the flopes are rapid, I have found a breccia, 

 (if 1 may fo call it), entirely confifting of fnail-fhells, combined 

 in a mafs of opaque flaladlitical fpar of a yellowifh brown co- 

 lour. The various progreflive augmentations of this matter 

 were to be traced in various fhades of the fame colour, which, 

 like the zones of the antique alabafter, curve round, and fol- 

 low the form of the fhell. The purer matter of this fpar has 

 penetrated the fliells, and in their interior hollows has formed a 

 lining of fmall cryftals, generally colourlefs and perfedlly tranf- 

 parent. 



I HAVE beftowed more time in endeavouring to defcribe the 

 compofition, and the real fituation, of this concretion of bones, 

 than the fubjedl, in the eftimation of many, will feem to de- 

 ferve, and indeed more than it deferves in my own opinion ; but 

 where an erroneous opinion has obtained a footing, in confe- 

 quence of inaccurate obfervations and partial defcription, it is 

 the duty of every new obferver to endeavour to corred: it. 



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