Deposits containing Fossil Plants. —-93 
The ‘ Submerged Forests’ met with during the excava- 
tion of Tilbury Docks apparently belong to the same 
period as those seen at Crossness and at the Albert Dock; 
they underlie a layer with Roman remains, but the small 
list of plants includes nothing characteristic of any par- 
ticular date :— 
Sambucus nigra. Quercus Robur sessiliflora. 
Betula alba. Sparganium ramosum. 
Alnus glutinosa. Carex. 
Corylus Avellana. Phragmites communis. 
TRIMINGHAM, NORFOLK. 
(Reid, ‘Geology of the Country around Cromer,’ 1882 ; 
and ‘Pliocene Deposits of Britain,’ Mem. Geol. Survey. 
1890.) 
Good sections of the Preglacial Cromer Forest-bed can 
be seen at the foot of the cliffs and on the foreshore at 
Trimingham. The Early Glacial freshwater deposits may 
also be represented there ; but I have not yet been able to 
find any of the characteristic Arctic plants in them. 
TWICKENHAM, MIDDLESEX. 
(Leeson & Laffan, ‘On the Geology of the Pleistocene 
Deposits in the Valley of the Thames at Twickenham. 
... + Quart. Journ. Geol. Soc, Vol. L., pp. 453-462. 
1894.) 
A small silted-up channel is here found beneath the 
Thames gravel. It is of interest as yielding mammals 
which perhaps point to a transition between the Paleo- 
lithic and Neolithic periods. The species are the Bison, 
Reindeer, Horse, and Bos longifrons. The plants include 
Galeopsis Tetrahit, usually a weed of cultivation; but there 
are no definite signs of cultivated plants or domesticated 
