SC0 2 (mM) N H 3 (^xM) P0 4 = (/xM) Si0 2 (/xM) Mn (ppb) 
3 0 100 200 0 50 100 0 200 400 600 0 1000 2000 
13 
Figure 2-2. Concentrations of TCC> 2 , NH 3 , PO 4 -, H 4 Si 04 and Mn ++ vs. depth in pore waters 
of the long core (NJ- 8 ) and four short cores from the Jamestown North study site. 
Note: Heavy lines show inferred concentration gradients at the sediment-water 
interface (from McCaffrey et al, 1977). 
