392 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 24, 



the beds of this rock is very variable ; the dip is at an angle of about 

 34° W.S.W. In one of the lower beds of this deposit footsteps 

 have occasionally been met with. In the quarry lying furthest to 

 the east the beds are more false than in any of the others, and yet 

 the general dip is the same. This false-bedding mil in some cases 

 extend to several beds, above and below which strata occur ha\ing 

 an inclination uniform among themselves, but differing from that of 

 the intermediate strata, which latter present great difference of dip, 

 some being more inclined and others approaching the horizontal. 

 (See fig. 1.) 



Fig. 1. 



The beds a a are such as have the usual dip of the quarry ; b b b 

 are more highly inclined, having the false dip ; and the beds c c, which 

 are also false, show the manner by which the false bedding is com- 

 pensated for by the thinning out, or thickening of a bed, as the case 

 may be. Such beds as c c are far from being uncommon in this 

 quarry, even where there is no highly inclined beds such as b b b ; in 

 which case they present the appearance of a stratum diagonally 

 divided, rather than the thinning out and thickening of two separate 

 strata. 



In that portion of the quarry which lies furthest to the south, the 

 bedding is much more uniform, and the dip, as shown on the faces of 

 the rock, is 34° W.S.W., being exactly that which the other quarries 

 afford when the dip is regular. In this quarry the rock consists of 

 thin flags, under which lies a more compact stone ; beneath this, two 

 beds of thick flags occur, and under these the rock again becomes 

 thin-bedded. These different rocks present the same purplish red 

 faces with those of the other quarries, with the exception of the flags 



