2 2 July 1749. 



ing fine texture. There are fome grains 

 of a dark fpar fcattered in it, which, to- 

 gether with fome other inequalities, form, 

 veins in it. The flrata which ly upper- 

 moftinthemountains confiftof a grey lime- 

 flone, v.'hich is feemingly no more than a 

 variety of the preceding. The black lime- 

 flone is conftantly found filled with petre- 

 fadions of all kinds^ and chiefly the fol- 

 lowing : 



PeBinites^ or petrefied OJirec^ PeBines, 

 Thefe petrefied lliells were more abundant 

 than any others that have been found here, 

 and fometimes whole flrata are met with, 

 confiding merely of a quantity of fliells of 

 this fort, grown together. They are gene- 

 rally fmall, never exceeding an inch and a 

 half in length. They are found in two 

 different ftates of petrefaclioni one {l;iews 

 always the impreffions of ttie elevated and 

 hollow furfaces of the (hells, without any 

 veftige of the {hells themfelves. In the 

 other appears the real (liell flicking in the 

 ftone, and by its light colour is eafily dif= 

 tinguifhable from the ilone. Both thefe 

 kinds are plentiful in the flone j however, 

 the impreiiions are more in number than 

 the real fhells. Some of the fliells are very 

 elevated, efpecially in the middle, where 

 ;hey form as it were a hump j others again 



are 



