﻿678 EOCENE AND CRETACEOUS OF THE NILE VALLEY. [Nov. 1905, 



had already met the point raised by Capt. Lyons. Unfortunately, 

 for want of exposures in the intervening areas, it was almost 

 impossible to follow the change from point to point. Mr. Bullen 

 Newton had fully explained the reasons which led to the error in 

 the determination of the Pectens in question. The field-notes 

 accompanying the specimens seemed conclusive evidence that the 

 latter were of Eocene, and not of Cretaceous, age. Moreover, as he 

 (the Author) had already mentioned, in some localities (notably near 

 Ain Amur) the passage from Cretaceous to Eocene was so gradual 

 that near the junction, fossils, typically characteristic of Cretaceous 

 beds in other places, occurred side by side with forms having distinct 

 Eocene affinities. 



