Wicken Fen. 
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OXFORD C LAY 
KIMERIDGE CLAY 
COR ALLIAN 
CORNBRASH £ 
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H^FEN GRAVELS PE/VT 
SILT 
Text-fig. 9.—Map of the Fenland. 
The boundary of the Fen area is shown by the black thick line. The 
“ Fen islands,” found chief!}' rising out of the peaty lands to the south, are 
also outlined in black. Note the positions of some of the still undrained 
spots (black) e.g., Wicken, Chippenham (really a valley Fen, outside the 
Fenland proper), Quy, &c., Adventurers’ Fen (see PI. IV., Fig. 3), which is 
partly drained, lies immediately to the south of Wicken Fen. 
