360 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 1917. 



pressed than the latter — it gives a period of nearly 30,000 years since 

 the beginning of accumulation of the peat. 



The correlation of the terraces in the neighboring vallej^s of the 

 Seine and the Somme is obvious, the extension of the Thames Valley 

 fairly so : 



The agreement of the levels is perfect, and also stage No. 2, and 

 the interval between 2 and 3 is characterized throughout by the 

 occurrence of the warm Chelles fauna and implements of older paleo- 

 lithic (Chellean-Acheulian) types. 



Thames Valley and. 

 South Coast 



Somme and 



Seine Valleys 



Lower Rhine Valley 

 and. North Germany 



Vosges and 



Moselle R. 



Plateau Central 

 and Pyrenees 



Alps 



Fig. 2. 



The loess-loam and underlying marine sands of Menchecourt are 

 found again on the coast in the raised beach and overlying deposits. 

 The classic section is that of Sangatte near Calais described by Prest- 

 wich. The raised beach lies about 10 feet above the level of the pres- 

 ent beach, and is directly overlain by typical " head " in which are 

 intercalated occasional bands of loess containing the land shells char- 

 acteristic of that formation. Similar sections occur at several points 

 on the northeast coast of France, and there is no doubt that they 

 agree with the exactly parallel sections at Brighton, on the coast 

 opposite, thus confirming our inferences about that deposit and the 

 age of the " head." 



France thus forms a triangle in which the Quaternary deposits 

 at each corner can be directly correlated with those of the neighbor- 

 ing parts of Europe. 



