76 



Origin of the British Flora. 



Corylus Avellana. 



Quercus sessiliflora. 



Fagus sylvatica. 



Salix. 



Populus tremula. 



Platanus (?). 



Juglans regia (?). 



Empetrum nigrum. 



Ceratophyllum submersum. 



demersum. 



Typha. 



Sparganium minimum. 



simplex. 



Potamogeton natans. 



cf. polygon i- 



folia. 

 Potamogeton rufescens. 



cf. colorata. 



graminea. 



cf. praelonga. 



perfoliata. 



crispa. 



Potamogeton compressa. 



obtusifolia. 



pusilla. 



rutila. 



cf. trichoides. 



— manna. 



Najas major. 



flexilis. 



Scirpus lacustris. 

 Eriophorum vaginatum (?). 

 Carex acuta ij). 

 cf. acutiformis. 



rostrata. 



Phragmites communis. 

 Taxus baccata. 

 Juniperus communis. 

 Pinus sylvestris. 

 Abies pectinata. 

 Picea excelsa. 

 Equisetum palustre. 

 Polystichum cf. Thelypteris. 



Hornsea, Yorkshire. 



(Phillips, 'Geology of Yorkshire,' 3rd edit. Part I., 

 pp. 75-79. 1875 ; Reid, 'Geology of Holderness,' Mem. 

 Geol. Survey, pp. 79-83. 1885.) 



Peaty mud fills a valley cut through the Glacial 

 deposits. It contains Mammoth (.-*), Irish Elk, Lion, and 

 Bos primigenius {?). The mollusca and plants are all 

 recent British forms. 



Prunus Padus. 



Alnus glutinosa. 

 Quercus Robur. 

 Salix. 



Pinus sylvestris. 



Potamogeton. 



Chara. 



The stratigraphical position of this deposit and its resem- 

 blance to other ' Submerged forests ' suggest a Neolithic or 

 Late Glacial Age. The occurrence of the Mammoth, Lion, 



