560 ON THE PRE-CAMBRIAN ROCKS OF PEMBROKESHIRE. 
Dr. Hicks, in reply, said that when the Director-General read his 
second paper he had only the night before returned from St. David’s, 
and it was therefore impossible to reply to the whole of the attack 
at the time. He was anxious also that the evidence which he 
had obtained should be thoroughly examined by the most com- 
petent authorities before it was submitted to the Society. Well- 
rolled pebbles of the Dimetian were so abundant in the Cambrian 
at one place (Chanter’s Seat) that they formed nearly the whole 
material of some of the beds. The statement that the three un- 
conformable divisions always occurred, even in small areas, was 
incorrect. He denied the repetition of the beds as asserted by 
the officers of the Survey. He thought the Pebidian in its characters 
and relations strikingly agreed with the Huronian of Canada, as 
admitted by Dr. Dawson. The unconformities were perfectly clear 
in coast-sections. 
