240 PROCEEDIIirGS OF THE G^IOLOGICAL SOCIETT. [Jan. 24, 



Fig. 2. — Map showing the extent of the Crag-sea area. 



The vertical tint indicates ancient land. 

 The horizontal tint indicates ancient seas. 

 The inclined tint indicates present land that has not been sub- 

 merged during the Crag period. 



