B 



Simplified diagram of supposed stages of Holocene coastal evolution in the 

 Netherlands. A,B: Atlantic stages; C,D: Subboreal stages; E: Post-Roman 

 stage. 



Legend: 1) Pleistocene deposits; 2) Lower Peat, Hydrobia clay (lagoonal 

 deposit?), etc., lying at base of sediments formed in tidal environments ; 

 3) Open sea and beach barrier sands; 4) Tidal flat formation; 5) Dune sands; 

 6) Sea level; 7) Height of present sea level; 8) Salt marshes, reed swamps, 

 etc. N.B. Peat layers intercalated locally in the tidal flat formation and 

 Subboreal peat deposits are not shown in the diagram. 



15 



