ISLE OF MAN. GEOLOGY. SANDSTONE. 547 



of the rock ; pointing out a certain analogy to the second- 

 ary strata, and indicating the share which mechanical 

 arrangements have taken in their formation. In the 

 case of graywacke, the same structure is abundantly 

 obvious, and in this instance it is equally extended to clay 

 slate. I must now proceed to examine the red sand- 

 stone, as next in order of arrangement. 



The general position and extent of this rock have 

 already been sufficiently detailed, and it has also been 

 seen that the principal tract occurs in the vicinity of 

 Peel. At the southern extremity of this mass, the 

 beds are elevated at an angle of forty-five degrees, 

 dipping to the north. In proceeding from this point 

 along the shore, they are found, after a short interval, 

 to decline from this elevation, until at length they 

 become nearly horizontal. As far as this point, no 

 marks of disturbance are visible ; but after again being 

 elevated into a high position, and once more returning 

 to the horizontal plane within a very short space, they 

 become exceedingly irregular, and then suddenly ter- 

 minate in the schist ; the junction being perfectly visible. 

 It is apparent, on considering the extent and form of 

 the whole mass, that where the beds are most regular 

 in their position, they are furthest removed from the 

 schist, and that their irregularity becomes conspicuous 

 only in proportion as they approximate to that rock. 

 The actual junction is most easily examined within the 

 high water mark, at the recess of the tide ; where it 

 is washed clean so as to be exposed to view with the 

 same freshness it would exhibit on fracture ; a very 

 desirable circumstance, but not often to be found. Under 

 the uncertainty already stated respecting the disposition 

 of the schist, it is impossible to determine in what way 

 the two rocks are disposed at the junction, as far as 

 their relative stratifications are concerned ; yet it may 

 be remarked generally, that the fissile tendency of the 

 schist is more or less opposed to the seams which separate 



