Figure F34. Interstitial water geochemical data for Site 1237. Open squares = calcium concentrations. Solid horizontal lines = lithologic unit boundaries, dashed lines = subunit boundaries (see "Description of Lithologic Units" in "Lithostratigraphy"). Values below the detection limit (0.1 然 for manganese and 11 然 for ammonium) are plotted at zero. Iron and barium concentrations (not plotted) are in almost all samples below their respective detection limits (iron = 1.1 然; barium = 0.03 然).