part 3] OF THE AYOISriAN AT CLIFTON. 245 



a sharp change of conditions seemed to be indicated in some of the 

 Author's slides. 



The Author thanked the previous speakers for their kind 

 reference to his paper. In reply to Prof. Grarwood, he said that 

 he had not paid attention to specific differences in either the 

 Mitch el deania or the Calci8])liera that he had met Avith. With 

 regard to a question concerning basin-shaped hollows in the Sg 

 limestone, he replied that hollows, perhaps of the kind suggested, 

 occurred in the pseudobreccias of D^ at Mells, but he had not seen 

 anything of the kind in the S beds. To Prof. Jones he said that he 

 had only been concerned with questions of lithology, but that he 

 agreed with those who had specially investigated the Carboniferous 

 Limestone in drawing the line between the Upper and the Lower 

 Avonian of the South- Western Province at the top of C^ : although 

 in the Avon Section there was no unconformity or even non- 

 sequence at this level, there was a marked change in lithology. 



