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K-d Diatom Ooze | | Mudstone

Dropstones I I Sand-Silt-Clay

K-d Diatom Ooze | | Mudstone

Dropstones I I Sand-Silt-Clay

FIGURE 6.4 (Upper panel) Multichannel seismic profile collected in north-westward direction from the Ross Ice Shelf (around 77° south and 175° west) showing acoustically well-stratified sediments. Two-way travel times of the multichannel seismic data (based on sound-wave velocities around 2 kilometers per second) indicate that the sediments are thousands of meters thick in the Ross Sea. Locations of the Deep Sea Drilling Project (DSDP) Leg 28 core sites 270, 271, and 272 are identified. (Middle panel) Interpretation of the multichannel seismic data with ages (in millions of years ago, mya) for the major sedimentary horizons. (Lowerpanel) Information about the composition and origin of the different sediment layers that were cored and collected during DSDP Leg 28 (see text). Based on multichannel seismic data from Cooper et al. (1991) and sediment stratigraphy interpretations from Anderson and Bartek (1992).

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