Ill] 



THE GEOLOGICAL RECORD 



47 



temperate climate. Among the plants of this pre- 

 Glacial flora are many familiar British species, such as 

 Caltha 2)alustris (marsh marigold), species of butter- 

 cup, Stellaria holostea (greater stichwort) (Fig. 3, C), 

 Bidens tripartita (bur-marigold) (Fig. 3, A), maple, 



Fig. 4. Trapa natans Linn. (nat. size). From Mundesley. 

 (Photographs by Mr and Mrs Keid.) 



hawthorn, the alder, hazel, the yew, Scots pine and 

 numerous others. If, as is not improbable, these 

 pre-Glacial plants were swept away by the subsequent 

 arctic conditions, the great majority of them returned 

 to their old home when a warmer climate ensued. 



