Figure F25. Plots of carbonate, total organic carbon (TOC) (squares = CNS analyzer data; dots = Rock-Eval pyrolysis values), total nitrogen, C/N ratios, and hydrogen index values for Site 1172. Data from Hole 1172A are presented in black, and data from Hole 1172D are shown in blue. Shaded areas on the C/N ratio plot delineate typical marine and terrestrial organic matter fields. Lithostratigraphic and preliminary biostratigraphic units are on the right side of the figure.