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Figure F5. Subseafloor structure of the hydrothermal field and the central valley of Iheya North Knoll based on the profile of multichannel seismic Line MCS18. Expedition 331 drilling sites and their proposed (not actual) depths are shown as blue bars along with possible lithological interpretation assuming that 1 s of two-way traveltime corresponds to 750 m. Units (A, B, and C) are those identified from the seismic reflection profile prior to drilling, set against our lithological interpretation based on the cores recovered. Curved colored lines represent an attempt to correlate significant reflectors. CDP = common depth point.

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