196 MINERJLOGICAL DESCRIPriON 



open, divided into many thin beds, the broadeft of which 

 does not exceed a foot in thicknefs. Its general colour is of a 

 whitifti grey, with a fmali mixture of yellow, and it is divided 

 tranfverfely by ftraight fepta or cracks, both fides of which are 

 covered with dendritical figures, of a yellowifh brown colour, 

 beautifully reprefenting the obje<5ls of landfcape. At the weft- 

 ern bafe of the mountain, on a level with the fea by which it is 

 waflied, a very extenfive ftratum occurs, of the fame nature as 

 the laft defcribed, bearing from north to fouth, parallel with, 

 and dipping towards, the mountain, nearly at an angle of 40 

 degrees. 



In fome parts of the weftern flope of the mountain, towards 

 the fouth, are found nefts of a dark red fliivery clay, in which 

 are embedded flints of a dirty fap green colour : Of thofe no 

 regular ftratum is to be perceived ; many of them are un- 

 fhapely mafles ; but they, in general, tend to the rhomboidal 

 form, and are from three to four inches long, by two or three 

 broad, and an inch and a half thick. They are not incrufled as 

 the flints found in chalk, nor have they the appearance of ha- 

 ving been worn by attrition. 



Upon different parts of the mountain, towards its bafe, are 

 found large quantities of fand, compofed of diff'erent materials, 

 and afluming various appearances as to colour. The largeft 

 bank of this arenaceous matter is upon the weftern fide of the 

 mountain, and confifts of fmall particles of cryftallized quartz, 

 colourlefs, and perfedlly tranfparent p^r/e, but of an ochreous 

 colour in the mafs, on account of a red argillaceous earth which 

 adheres to them. The fand of this bank is perfedlly loofe and 

 uncombined : one half of it has been levelled into an extenfive 

 parade, its furface having been combined by the lime and rulp- 

 bifli from the ruins of the town. The fouthern extremity of 

 the bank is ftill to be feen in its natural flate, and forms the bu,- 

 rying-ground of the garrifon. 



Upon 



