k 



8 



ILLUSTRATIONS OF THE 



in the heart of fome mountain, deep imbedded 

 in the folid rock. 



■t 



4. Charaders of the fame import are alfo 

 found among the argillaceous Itrata, though per- 

 haps more rarely than among the calcareous or 

 iiliceous. Such are the impreffions of the leaves 

 and Items of vegetables ; alfo the bodies of filh 



ma 



found 



ry 



ften 



ds of argillaceous fchiftus, and 

 s having the figure accurately 



im 



d amphibious 

 the different kir 

 in mod inftance 



preferved, but the fubftance of the 

 placed by clay or pyrites. Thefe are all re- 

 mains of ancient feas or continents ; the latter of 

 which have long fince difappeared from the fur- 



ftill their memory 



ire nature has 



face of the earth, b 



h 



preferved in thofe arch 



h 



ded the revolutions of the glob 



/* t X 



5. Among b 



bodies, pit-coal is th 



only one which conftitutes regular and extenfive 



ft 



d no foffil h 



Its 



gi 



from the 



(le of former continents, marked by iironger 



d more diftinifl: charadt 



N 



to m 



that the coal ft 



are 



d 



th thofe 



th.it have been already enumerated, and that 

 they often contain ftiells and corals, perfedly 



1 



mineralized, it is fufticient to remark, that there 



r 



are entire beds of this foftil, which appear to 

 conHft wholly of wood, and in which the fibrous 



ftra(5Lure is perfedly preferved. From thefe in- 



ftanceSo 



'4 , 



