74 Origin of the British Flora. 



Quercus Robur. Scirpus lacustris. 



Pinus sylvestris. Carex dioica. 



Potamogeton heterophyllus. echinata. 



perfoliatus. canescens. 



pusillus. flava. 



Eleocharis palustris. Isoetes lacustris. 

 Scirpus pauciflorus. Chara. 

 setaceus. 



Happisburgh, Norfolk. 



(Reid, 'Geology of Cromer/ Mem. Geol. Survey, 1882; 

 Reid, * Pliocene Deposits of Britain,' Mem. Geol. Survey, 

 1890.) 



Slabs of clay-ironstone full of leaves and twigs are 

 thrown up by storms at this spot. They belong to the 

 lower part of the Preglacial Cromer Forest-bed. This 

 locality is the only one where determinable Preglacial 

 leaves are found in any quantity. 



Cornus sanguinea. Fagus sylvatica. 



Ulmus. Salix, 2 sp. 



Betula alba. Pinus sylvestris. 



Alnus glutinosa. Picea excelsa (cone). 

 Quercus Robur. 



HiTCHiN, Hertfordshire. 



(Reid, *The Palaeolithic Deposits at Hitchin and their 

 Relation to the Glacial Epoch,' Proc. Royal Soc, Vol. LXI., 

 pp. 40-49. 1897.) 



The plant-bearing deposits rest in a hollow eroded 

 in the Glacial beds, underlie brick-earth with Palaeolithic 

 implements, and apparently correspond with the Inter- 

 glacial deposits at Hoxne, though the overlying stratum 

 with Arctic plants has not been discovered at Hitchin. 



Ranunculus aquatilis. Montia fontana. 



sceleratus. Prunus spinosa. 



: repens. Poterium officinale. 



