Figure F14. Downhole logs of an interval with cyclic alternations from ODP Leg 128 Site 798B. SFLU = focused induction resistivity, IMPH = medium induction resistivity, RHOM = bulk density, HSGR = standard (total) gamma radiation, FMS = Formation MicroScanner (resistivity image of the borehole wall). The cyclic nature of alternating dark and light intervals in cores is related to orbital-scale variability of paleoceanographic conditions in the Japan Sea. Gray areas correspond to dark clay- and organic matter–rich intervals in cores and correlate with high values in gamma ray, density, and resistivity logs and low conductivity values in FMS images.
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