424 On the ROC KS in the 



ing cut in a certain direction, a fection having the appearance of 

 an infulated mafs, would of courfe be expofed to view. There 

 is no doubt that fuch a circumfiance is perfectly poilible ; but, 

 in the prefent inftance, this explanation will not be found at all 

 applicable. In every other cafe, where the ftrata appear difplaced, 

 they are not torn from the reft, nor has the greenftone infinuated 

 itfelf, except as a wedge, fupporting the lifted mafTes. The 

 included mafs is of a light greenifh-grey colour, in fhape quadran- 

 gular, and, when minutely examined, will be found fhivered in- 

 to numerous diftinct fragments, with veins of greenftone run- 

 ning through it in every direction. It partly retains its ori- 

 ginal ftratified texture (No. 45.) although indurated in a very 

 high degree, and is fo firmly welded to the greenftone, that it 

 is no difficult matter to obtain fpecimens (No. 46.) of the 

 conjoined rocks ', one fmall fpecimen (No. 47.) in the collec- 

 tion, is twice interfered by that fubftance. It, therefore, has no 

 refemblance whatever to thofe pieces of ftrata, which are only 

 in part detached, and which, if cut in a tranfverfe direction, 

 would, in all probability, exhibit an infulated fection. That 

 fecTion, however, would not difplay the broken and diftorted 

 appearance defcribed above, at leaft if we may be allowed to 

 judge by the integrity of the longitudinal fe&ions, of which 

 there are fo many examples in this vicinity. Befides, the colour 

 of the included mafs is totally different from that of any of the 

 ftrata near it, which are here of a deep red (No. 48.), and at 

 this particular fpot are remarkable for their apparent derange- 

 ment. I therefore conclude, that there is every reafon to con- 

 fider this, as a fragment detached from fome other part of the 

 fandftone, and left fufpended in its prefent fituation, when the 

 greenftone aflumed a folid confiftence, as was originally con- 

 jectured by Dr Hutton. n 



