414 On the ROCKS in the 



The two lafl of thefe are not comprehended in the Coal For- 

 mation mite ; they are confidered as members of another for- 

 mation, denominated the Neweft Floetz-Trap. 



The upper fandftone of St Leonard's Hill, and the lower 

 fandflone of Salifbury Craig, are, fo far as we know, continu- 

 ous ; but as thefe, fuppofing the lines of the ftrata to be pro- 

 jected, would form a bed of 450 feet thick, it is poflible 

 alternations of greenftone may occur in it. Above, I have on- 

 ly mentioned fuch as are vifible. 



Those on the right of the Hunters' Bog, are not fo diftinctly 

 expofed as the reft ; but the foflils are all found in the order I 

 have ftated. Occafionally fmall feams of reddifh-brown co- 

 loured ilaty clay, and clay-ironftone occur, principally inter- 

 mixed with the fandftone ; but they ave fo thin, and fo uncon- 

 nected, that they can fcarely be confidered as ftrata. 



The feries of fpecimens I am now about to defcribe, are thofe 

 of St Leonard's Hill and Salifbury Craig. 



No. 1. is a fpecimen of the Sandftone of St Leonard's Hill ; 

 it is of a reddifh- white colour, and extremely coarfe-grained. It 

 was taken from the middle of the quarry, and prefents a fpe- 

 cies of conglomerate, the fragments of fandftone being agglu- 

 tinated by a dark-red ferruginous pafte. 



No. 2. from the fame quarry, is more compact, and prefents 

 a ftreaked appearance, correfponding with the direction of the 

 ftratum. There is a confiderable degree of irregularity to be 

 obferved, in tracing the line of junction at St Leonard's Hill. 

 In fome places, two or three folds of the ftrata are cut off 



abruptly 



a name which, though perfectly underftood in this country, is not received 

 abroad, and ought therefore to be reiinquifhed. 



