ITALY. LETTER XVIII. 2&1 



ceous flate fuddenly arifing from under ground, or 

 dipping into it, towards or under Florence, and 

 Undoubtedly under the Apennines. This (late 

 was, in the greateft vifible depth, pure and un- 

 mixed ; but in the fame proportion it came nearer 

 to the furface, it was mixed with mica; infomuch, 

 that the uppermoft ceafed to be fhivery, and refem- 

 bled rather a found macigno, as appeared in the 

 quarries near the road in monte Euoni. Now and 

 then there appeared in it frhall black argillaceous 

 and bituminous nodules. 



Nearer towards Florence, above the argillaceous 

 flate which dipped in the ground, I found grey 

 limeftone, which continued to the city. 



A. Grey Cicercbina, or fine-grained calcareous breccia, com- 

 pofed of globular white limeftone-pieces, fmall globular frag- 

 ments of la'/a, forne quartz-grains, and a lime-cement ; 

 mixed fometimes with green petrified argillaceous fpots ; em- 

 ployed in the marble-grinding. 



t. Red Cicercbina, of a reddifli lime-cement and blunted 

 pieces of black lava. 



e. Large fragments of black lava with ihclofed white lime- 

 ftone. 



d. Black-white-ipotted porphyry, fimilar to the ferfitttihf 

 aer" antico defcribed in one of my Letters from- Rome ; is fail 

 to be found in fome Tufcan-hills ; as aflured to me by Mr* 

 Targiom Tozzetti, and evidenced by thefe fragments. 



*. Red and brown-mixed jafper; 



f. Red and brown-mixed petrified calcareous earth. 



