SALISBURY CRAGS- 53 



of this hill, have exposed in the clearest manner the vari- 

 ous connexions of the trap with the stratified rocks. At 

 its southern extremity both rocks, the greenstone and sand- 

 stone, dip to the N. E. by E., in the more central parts of 

 the hill E., and at the northern end S. E. by E. and 

 E. S. E. At the southern extremity of the ridge there is a fine 

 example of the entanglement of masses of sandstone in the 

 greenstone ; these are changed in some places into granular 

 quartz andinothers intohornstone, the masses areseveral feet 

 in length, but do not exceed a few inches in breadth, (PL III. 

 Fig. 2.) The greenstone, as it does through a considerable 

 portion of the hill, here rests upon an arenaceous limestone 

 of a brownish-red colour, a portion of which is broken 

 off and bent upwards amongst the greenstone. (PL III. 

 Fig. 3.) On proceeding along the road in a northerly di- 

 rection another mass of sandstone, but on a much larger 

 scale, is enveloped in the greenstone : it is of a square form, 

 and is traversed by veins of Compact Greenstone. At this 

 point the sandstone and arenaceous limestone are contorted 

 in various ways ; and fractured in many places. (PL IV.) 

 From the great disturbance manifested here, and also from 

 the absence of that sandstone which is found under the 

 trap, it is likely that this point has been one of the open- 

 ings through which the greenstone matters flowed, and that 

 through this fissure the mass of sandstone has been floated 

 upwards. For a considerable way the sandstone, which is 

 here of a red colour, is indurated, and in some places al- 

 most assumes the character of jasper, this induration 

 decreasing as we examine at a greater distance from the in- 

 durating cause. By still advancing to the north, near a nar- 

 row pass in the greenstone called the Cat Nick, (PL V. 

 Fig. 1.), where there is a shift in the sandstone, a vein of 

 greenstone about four feet wide traverses both the sandstone 



