171B Scientific Prospectus


Figure 171B-1. Location of ODP Leg 171B Blake Nose paleoceanographic drilling transect.

Figure 171B-2. Location of Blake Nose, Western North Atlantic. Insert shows proposed drill sites and seismic lines shown in Figures 3 (dashed line) and 5 (shaded line).

Figure 171B-3. Schematic seismic interpretation of MCS Line TD-5 across Blake Nose showing the major reflectors, their interpreted ages, and proposed drill sites (primary sites = bold lines; alternate sites = thin lines). Our interpreted ages of reflectors are shown in parentheses and age interpretations of Hutchinson et al. (in press) are shown in square brackets. Numbers identifying various reflectors are those interpretations of Hutchison et al. and correspond to numbers shown on Figure 171B-4. Location of seismic line is shown in Figure 171B-2.

Figure 171B-4. Interpretation of MCS Line TD-5 from the Leg 44 scientific party. Note that this interpretation suggests the presence of a substantial thickness of mid- and Upper Cretaceous pelagic/hemipelagic sediments on Blake Nose.

Figure 171B-5. Portion of seismic Line TD-5UW showing the tie to DSDP Site 390 interpreted by Hutchinson et al. (in press). This interpretation has traced seismic units [70] and [80] at Site 390 into systematically deeper levels of the seismic profile at shotpoint 2101 than we would. Location of seismic line is shown in Figure 171B-2, and units identified on Figure 171B-3.

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