UPPER PORTION OF DUNDRY HILL. 219 



VIII. The Bajocian Denudation.^ 



Nowhere at Dandry Hill is the sequence of Bajocian 

 strata complete ; there is, even at the main-road quarries, 

 where deposits have been laid down during the greatest 

 number of hemeree, a break in their sequence, so that the 

 succeeding bed rests non-sequentially upon the planed-off 

 surface of the Ironshot Oolite. 



The portion of the Dundry strata which suffered least 

 from the Bajocian denudation, is that lying between the main 

 road on the west and East Dundry and Rackledown on the 

 east. Westward of this the Bajocian denudation has re- 

 moved two important fossiliferous beds, namely, the Iron- 

 shot Oolite and the Witchellia-hed. East of this area there 

 are unfortunately no exposures until Maes Knoll is reached, 

 when the effects of denudation are very striking. The Iron- 

 shot Oolite and all the limestone-beds which underlie it 

 have been removed ; and further denudation must have 

 taken place there in Bathonian time while deposition was 

 going on quietly at the western end of the hill, for at Maes 

 Knoll there is found a conglomeratic bed of the date of the 

 Garmitiance hemera resting upon and containing fossils 

 and rock-frasrments derived from beds of the Dumortierice 

 hemera, 



^ It should be noted that the term "Bajocian denudation" does not 

 mean denudation of rocks of Bajocian age, which might have happened 

 at any date, but a denudation (of any rocks) which was effected during 

 the Bajocian age. In the present case, so far as Dundry is concerned, 

 the denudation doubtless began towards the close of the Bajocian age, 

 and ended at the beginning — before the second hemera — of the Batho- 

 nian age. But there is evidence at other places that it continued during 

 the second hemera of the Bathonian age. 



