We built a continuous meters composite depth (mcd) scale and a splice (as defined in "Composite Section" in the "Explanatory Notes" chapter) that range from the top of Core 184-1147B-1H to the bottom of Section 184-1147B-9H-6. The splice and the mcd extend from 0 to 90.73 mcd and span the entire cored sequence.
Site 1147 was drilled in order to recover a slumped section missing from Site 1148, as described in "Background and Objectives". A continuous mcd and splice can be constructed for the local region if data are combined from Site 1147 and nearby Site 1148. The correlation is accomplished by tying Sample 184-1147C-6H-4, 112 cm (49.22 mcd), to Sample 184-1148B-5H-5, 32 cm (46.57 mcd).
The mcd scale and the splice are based on the stratigraphic correlation of whole-core MST and split-core CSR data (lightness, L*) collected at 4- to 5-cm intervals (see "Physical Properties" for details). From the MST, we used magnetic susceptibility (MS), gamma-ray attenuation (GRA) bulk density, and natural gamma radiation (NGR) data. These data and the splice constructed from them are presented on the mcd scale in Figures F1, F2, F3, and F4 (also as Synergy Software KaleidaGraph plots and Microsoft Excel data files [see the "Supplementary Materials" contents list]; the spliced records are also available in ASCII format). The depth offsets that comprise the mcd scale are given in Table T3 (also in ASCII format). The splice tie points (Table T4, also in ASCII format) should be used as a guide for detailed postcruise sampling.
Magnetic susceptibility data were the most useful stratigraphic tool for correlation at this site. Natural gamma radiation and CSR data were helpful in intervals where structure in the MS profile was ambiguous.
We constructed the mcd scale by assuming that the uppermost sediment (the "mudline") in Core 184-1147B-1H was the sediment/water interface. This core, the "anchor" in the composite depth scale, has the same depth on both the mbsf and mcd scales. We correlated downhole from this anchor, core by core, until we reached the bottom of Hole 1147B, the deepest penetration at the site.