HEAD0N HILL AND COLWELL BAY IN THE ISLE OF WIGHT." 127 



he had never seen more himself. Ho thought " Upper Eoceno " and 

 "Oligoccne" equivalent terms, and the question, which should remain 

 in use ? one of priority. 



Mr. Whitaker said that cliff-sections in soft beds were apt to 

 vary from time to time, so that observers who saw them under 

 different conditions of exposure were likely to differ in inter- 

 preting them. The examination of other parts of the island, 

 and especially the mapping of limestones or other well-marked 

 beds, might partly help to settle the question in dispute. Perhaps 

 the Geological Survey map had been constructed rather too much 

 on theoretical grounds. 



The President said that on the one hand we had the minute 

 measurements of Messrs. Keeping and Tawney, and, on the other, 

 the wider views of Prof. Judd. At any rate these views were now 

 on both sides well laid before the Society ; and the question, although 

 a difficult one, as he had himself found in working over the ground 

 25 years since with Dr. Wright, would be now carefully examined 

 by many others. 



Mr. Tawney said that he thought Yon Konen, in 1864, had rightly 

 correlated the German and English beds. As for Mr. Whitaker's 

 remarks, he thought a person who was puzzled by a cliff-section 

 would make but little of a drift-covered country where no sections 

 were to be seen. He still denied what Prof. Judd had said about 

 there being more than one marine series. The Cerithium concavum 

 zone of Prof. Hebert at Hordwell did not occupy the position attri- 

 buted to this zone by Prof. Judd in Headon Hill. He maintained 

 that there was but one Yenus-bed. The 6-inch Ostrea vectensis bed 

 in the Bembridge beds could not be confused with the Middle-Headon 

 Yenus-bed. 



