At Site 1085 two holes were cored with a maximum penetration of 604 meters below seafloor (mbsf). Physical properties and color reflectance data were measured at 2-cm (Hole 1085A, 0–100 mbsf) and 4-cm (Hole 1085A [below 100 mbsf] and Hole 1085B) intervals. The correlation of features present in the physical and visual properties measurements of adjacent holes were used to demonstrate the completeness of the local stratigraphic sequence drilled and to establish a depth scale in terms of meters composite depth (mcd) for Site 1085. The continuity of the stratigraphic sequence could be demonstrated between 0 and 298 mcd (Fig. 16; Table 8).
At Site 1085, magnetic susceptibility and total spectral reflectance were used to establish the mcd scale. The data sets were extensively processed before being used for correlation. Suspect measurements were eliminated by thresholding the data. The resulting data were smoothed using a Gaussian filter with a length of 31 cm. All data shown in Figure 16 and Figure 17 were processed as described above.
A stratigraphic correlation using two holes cannot be completely constrained. Depth intervals for which the correlation is not well constrained are at 60, 78–80, 131–133, and 163 mcd. A gap in the composite section, however, does not appear to exist. With a length of 298 mcd, Site 1085 contains the longest composite record of ODP Leg 175.
The spliced record presented in Figure 17 is continuous to 298 mcd for magnetic susceptibility and total color reflectance (Table 9). The selection of cores to be included in the spliced record and the placement of tie points were carried out mainly using magnetic susceptibility.
The growth of the mcd scale compared with the standard ODP msbf scale is ~10 (Core 175-1085B-31H at 307 mcd and 279 mbsf). In the depth interval from 150 to 180 mbsf (167–193 mcd) the offsets decrease by ~3 m (Fig. 18). This is observed at Holes 1085A and 1085B. In both holes, four successive cores (175-1085A-17H through 20H, and 175-1085B-17H through 20H) overlap by as much as 1 m.