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from 20 to 50 feet. The 

 second or Old Quarry is 

 relatively smaller and shal- 

 lower, and lies about 100 

 yards to the north-east of the 

 first. Both are excavated in 

 the outcrop of the so-called 

 ' Permian ' rocks. 



The strata of the New 

 Uuarry are dominantly purple 

 marls (rarely green), often 

 obscurely bedded, alternating 

 irregularly with massive sheets 

 and flaggy layers of red (and 

 green) calcareous sandstones. 

 Many of the sandstone layers 

 are inconstant in character and 

 lenticular in shape, with an 

 undulating and irregular sur- 

 face. jS"ear the top of the 

 succession of strata seen in 

 the sides of the quarry is a 

 bed of massive conglomerate, 

 which varies in thickness from 

 place to place, and lies at 

 times with local unconformity 

 upon the beds beneath. 



The rocks in the Old Quarry 

 are practically all sandstones, 

 of more or less massive type 

 in the lower beds, but flaggy 

 in the upper layers. 



All the fossils, without ex- 

 ception, have been obtained 

 from the New Quarry, of which 

 I append (fig. 2) a measured 

 section. Those collected in situ 

 were found in relief on the 

 under surfaces of the sand- 

 stone beds. By far the larger 

 proportion, however, were col- 

 lected from the loose blocks in 

 the quarry ; but a careful 

 comparison of the blocks has 

 enabled me to identify them 

 with the actual layers in the 

 quarry from which they must 

 have been derived. 



