Vol. 52.] 



PLIOCENE DEPOSITS OF HOLLAND. 



781 



in the Amstelien, the presence of any of them in the lower beds 

 being also marked ; and the second, those which are confined to the 

 latter. The more abundant forms are indicated by thicker crosses ; 

 those which seem to distinguish the Amstelien are indicated by the 

 letter A. It will be seen that most of these are abundant, and 

 are also common in the Upper Crag, while they are either absent 

 from the Walton bed, or are rarely found in it. 



Synoptical Table of the Pliocene Strata. 



England. 



Belgium. 



Holland. 



Cromer Beds. 



(Forest Bed Series). 







Weybourn & Bure 

 Valley Crag. 



Chillesford Clay. 



Norwich Crag. 



Red Crag. 





Amstelien. 



Walton Crag : 

 Upper bed. 

 Lower bed. 



Poederlien. 

 Scaldisien. 



Scaldisien. 



Coralline Crag. 

 Lenhain Crag. 



Zone a Isocardia Cor. 

 Diestien Sands. 



Diestien. 



EXPLANATION OF PLATES XXXIV. & XXXV. 



Plate XXXIV. 



Map to illustrate the possible distribution of land and water in the Anglo- 

 Dutch Area during the various stages of the Pliocene Period. 



Plate XXXV. 

 Map of the Crag District, on the scale of 4 miles to the inch. 



Discussion. 



Mr. Clement Eeid agreed that the dominant factor in Newer 

 Pliocene geography was the folding which raised an east-and-west 

 barrier across the South of England and Belgium, gradually forced 

 northward the Pliocene sea and the estuary of the Rhine, and 

 caused the accumulation in Holland of an enormous thickness of 

 shallow-water deposits. He suggested that the ' Amstelien ' may 

 fill the gap between our Walton and Butley Crags, for the fauna is 

 scarcely as Arctic as that of the Butley Crag. The evidence seems, 

 however, hardly sufficient to settle this point. 



