432 On the ROCKS' in the 



appearance, however, beipeaks their having been, at fome for- 

 mer period, totally included in the greenftone. One mafs, in- 

 deed, a little towards the north, is unequivocally fo ; at leaft we 

 know with certainty, that a fhort time ago it was inclofed in 

 the greenftone, and not to be feen ; and there is at prefent, great 

 apparent probability, that the next fe&ion taken from the fame, 

 part of the rock, will carry it away altogether. 



Till now, we only knew of one included mafs in the green- 

 Hone of Salifbury Craig ; and with this, thefe now difcovered 

 have considerable analogy ; they are of the fame colour, and al- 

 though they appear to be only four or five diftincl mafles, 

 thefe mafTes are all interfered vertically and diagonally, and 

 are fpj.it through the whole length of the horizontal line ; fo 

 that in examining a feclion of about ten feet perpendicular, no, 

 lei's than nine different alternations of fandftone may be reckon- 

 ed. Some of them are no doubt very minute ; but ftill they were 

 all obfervable when I examined the rock. . 



From the moft northern mafs of included fandftone, I was 

 enabled to prociue a few fpecimens, which I have added 

 to the aboye collection. The rock rifes fo rapidly from 

 the f >uth, that although this mafs is nearly in the fame hori- 

 zontal line with the others, all of which crop out to the furface, 

 and although it is not diftant more than four or five yards, yet 

 it appears to be fituated nearly about the middle, between the 

 fandftone and the upper furface, from which it may natural- 

 ly be inferred, that the maffes which now crop out, were like 

 this, once entirely included in the fubftance of the greenftone. 

 It is highly indurated., and at the extremities, is drawn out into 

 minute veins. The thicknefs of the principal mafs may be 

 from ten to twelve inches, and in length from fix to eight feet. 

 This body, as above noticed, is cut in all directions by the 



greenftone. 



