Figure F11. Core image of lithostratigraphic Unit III/ IV boundary, Hole U1407A. White (N 8) nannofossil ooze (Unit IV) forms a sharp contact with overlying greenish gray (5GY 6/1) clayey nannofossil ooze (Unit III). This is accompanied by a decline in carbonate content from ~85 to ~40 wt% and increases in magnetic susceptibility and natural gamma radiation (NGR). All three holes at Site U1407 feature several lighter intervals in the 5 m immediately above the boundary, characterized by higher nannofossil abundance and carbonate content of ~70 wt%.
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