Figure F50. Concentration profiles of alkalinity, dissolved NH₄⁺, and PO₄^3- at Site 1149. Open circles = Hole 1149A; solid circles = Hole 1149B. Lithostratigraphic units and subunits are as defined in "Lithostratigraphy" in "Sedimentology". Shaded regions indicate the position of the suggested clay alteration zone of Subunits IIA and IIB.