84 Origin of the British Flora. 



Arctic plants, and corresponds to the similar deposit at 

 Mundesley, Salix polaris being abundant. The older deposit 

 yields : — 



Thalictrum flavum. Alnus glutinosa. 



Ranunculus aquatilis. Corylus Avellana. 



Hippuris vulgaris. Quercus Robur. 



Trapa natans. Taxus baccata. 



Cornus sanguinea. Pinus sylvestris. 



Menyanthes trifoliata. Picea excelsa. 

 Rumex maritimus. 



The Early Glacial bed contains : — 



Hippuris vulgaris. Potamogeton. 



Retula nana. Carex. 



Salix polaris. 



OVERSTRAND, NORFOLK. 



(Reid, ' Geology of the Country around Cromer,' and 

 'Pliocene Deposits of Britain,' Mem. Geot. Survey. 1882 

 and 1890.) 



At this locality the Preglacial Cromer Forest-bed is 

 full of drift-wood and fir-cones, and its upper, freshwater 

 division contains seeds of Crataegus Oxyacantha — a plant 

 unknown elsewhere in Preglacial deposits. The other 

 plants are all common to several localities and the list 

 need not be repeated. 



OVERTOUN, NEAR BEITH, AYRSHIRE. 

 (Craig, Trans. Geot. Soc. Glasgow, Vol. IV., p. 145.) 



Hazel nuts are here said to occur between two masses 

 of till. 



Oxford. 



(A. M Bell, ' On the Pleistocene Gravel at Wolvercote, 

 near Oxford,' Rep. Brit. Assoc, for 1894, p. 663.) 



A Pleistocene alluvial deposit at Wolvercote, near 



