SALISBURY CRAG. 3 c 7 



grain near its upper surface, on which rest beds of sandstone, iron- 

 stone, and shale, as under : 



1. The upper part of a dolerite mass, fine grained, and of reddish colour. Veins 



of calcareous spar, with micaceous iron ore, divide the upper part of this mass, 

 and pass through Nos. 2 and 3 above. 



2, 3. Mass of siliceous sandstone, mixed with softer green portions. 



4. The same sort of hardened sandstone, with less of the softer parts (here and 



there a purple tinge). 



5. Argillaceous, compact, hard shale of a purplish or green colour, and subcon- 



choidal fracture. 



6. Red argillaceous ironstone in green shale. 



7. Sandstone beds, reddish and indurated. 



Fig. 60. 



At the point b (fig. 60) a nearly similar series of alternating stone 

 and shale rests on very similar dolerite. A portion of sandstone is 

 engaged in the trap, and other signs of violent intrusion occur. 



Fig. 61. 



Fig. 62. 



At the point c (fig. 60) hard red sandstone flags, without ironstone, 

 rest on reddened greenstone. 



A large quarry at the south end of Salisbury Crag affords an ex- 



Fig. 63. 



cellent section of sandstone beds below the dolerites. Figs. 61 and 62 

 are taken from this quarry. 



In fig. 63 the dolerite, reddening below, rests on jasperised sand- 

 stone, which is much broken and confused in places. Below this is 



