64 Origin of the British Flora. 



Crianlarich, Perthshire. 



Peaty loam with leaves of Arctic plants was found in a 

 railway cutting, and a sample given to me by Mr. J. R. 

 Dakyns yielded the subjoined species. The exact relation 

 of the deposit to the old moraines is not perfectly clear, 

 though the plant-bed would seem to be the newer of the 

 two, and therefore Late Glacial. 



Dryas octopetala. Salix herbacea. 



Betula alba. reticulata. 



nana. Empetrum nigrum. 



Salix repens. 



Cromer, Norfolk. 



(Reid, ' Pliocene Deposits of Britain,' Mem. Geo/. 

 Survey. 1890; Reid, 'Geology of the Country around 

 Cromer,' Mem. Geol. Survey. 1882.) 



The Preglacial Cromer Forest-bed at Cromer itself is 

 mainly of estuarine origin, and yields therefore only drift- 

 wood and cones of Scotch and Spruce Firs. About 

 three-quarters of a mile north-west of Cromer black mud 

 belonging to the lower part of the Forest-bed is full of 

 aquatic plants. The species are : — 



Ranunculus aquatilis. Potamogeton praelongus. 



Myriophyllum spicatum. Eriophorum angustifolium. 

 Potamogeton lucens. 



A full list of plants from the Cromer Forest-bed of all 

 localities will be found in the Table, p. 171. 



Crossness, Essex. 



Spurrell, ' On the Estuary of the Thames and its 

 Alluvium,' Proc. Geol. Assoc., Vol. XL, pp. 210-230. 1889.) 

 Two beds of peat or ' submerged forest ' are here met 

 with beneath the estuarine deposits of the Thames and 

 underlying the Roman layer. The deposits are synchronous 

 with those at Tilbury and at the Albert Dock. 



