CAMBRIDGESHIRE 

 SURE^CE GEOLOGY 



Scale of Miles 

 



|::;:!| Fen Silt 

 : . :|Peat 

 n~| ChaJk 

 m Clay (Boulder, Gault. 



Ampthill, Kimeridge. 



Oxford) 



Gravel 

 II I I II Greensand 



Corallian Limestone 



Fig. 29. 



This map is based upon that of the Geological Survey. The boundary between 

 the fen silt and peat is taken from the map accompanying S.B.J. Skertchly's The 

 Geology of the Feiiknd (1877). This boundary is "very obscure, for the peat thins out 

 insensibly. . ." (p. 129). 



