424 On the. ROCKS in the 
ing cut in acertain 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 poffible ; 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 mafles. The 
included mafs is of a light greenith-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 {mall fpecimen (No. 47.) in the collec- 
tion, is twice interfected 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 diredtion, 
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 fections, 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 
{trata 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 affumed a folid confiftence, as was originally con- 
jectured by Dr Hutton. 
I 
