s.w. 



-2305 



-2420 



Figure 2. 



Contact of two series of deposits formed in tidal flat environment (s.l. ). 

 Vertical sections in SW, W, NW and NE parts of excavation at Velsen 

 (Northwest of Amsterdam). All depths in meters below Dutch Ordnance 

 Datum. The absolute ages (in years, determined by radiocarbon method) in 

 this diagram refer partly to average values. 



SW-section - up to 15.57 m. Pleistocene sands; 15.57-15.45 m. Lower Peat; 

 15.45-14. 07 m, Hydrobia clay; 14.07-3.25 m. channel floor and tidal flat 

 deposits of older series; 3.25-2.55 m. salt marsh clays of older series; 

 2.55-1.65 m. beach barrier sands; 1.65-0.25 m. lacustrine deposits. 



W-section - up to 15. 29 m. Pleistocene sands; 15. 29-15. 17 m. Lower Peat; 

 15. 17-13. 90 m. Hydrobia clay; 13.90-13.00 m. channel floor deposits of 

 younger series. 



NW-section - up to 16. 10 m. Pleistocene sands; 16. 10-14. 75 m. Hydrobia 

 clay; 14,75-3. 10 m. channel floor and tidal flat deposits of younger series; 

 3.10-1.20 m. lacustrine deposits. 



NE-section - up to 16.20 m. Pleistocene sands; 16.20-16.00 m. Lower Peat; 

 16.00-14.75 m. Hydrobia clay; 14.75-3.00 m. channel floor and tidal flat 

 deposits of younger series; 3.00-1.00 m. lacustrine deposits. 



13 



