Figure 6. Diagrams of depth and time vs. distance for idealized clinoform sequences and the optimal strategy for drilling them. The most seaward drill location is most likely to recover a complete record across sequence boundary 2 (SB2), containing biostratigraphic markers known from the deep-sea record; this was the strategy used during Leg 150 and will be continued on Leg 174A at (back-up) upper slope Sites MAT-13A to D (see Fig. 1). The other two locations shown will recover critical shallow-water facies across SB2. The most landward location will recover latest highstand deposits below SB2 (Site MAT-8B); the center location will recover early lowstand deposits above SB2 (Site MAT-9B). Such site pairing is crucial to understanding both the amplitude of sea level changes and the facies associated with clinoform geometries.