Magnetic susceptibility (MS) and sediment lightness (L*) data collected from Holes 1262A, 1262B, and 1262C at 2.5-cm intervals were used to construct the composite section for Site 1262. The MS measurements were primarily used for core-to-core correlation and to construct the composite section (Fig. F4). The depth offsets that define the composite section for Site 1262 are given in Table T2.
The composite data show that the cores from Site 1262 provide a continuous sequence down to 236.4 meters composite depth (mcd), the total depth of Hole 1262C (Core 208-1262C-14H; upper Maastrichtian). The MS data from the multisensor track (MST) were affected by reduced core diameter at the base of Section 208-1262C-12H-7. MS point-sensor measurements taken on the archive half were therefore used to confirm the correlation of this interval. Following construction of the composite depth section for Site 1262, a single spliced record was assembled from the aligned core intervals from all three holes (Table T3).
Cores that had been significantly stretched, squeezed, or disturbed by the coring process were not used for the splice. Without a stretch or squeezing correction, all points within each core are offset equally. As a result, most of the cycles are not perfectly aligned between holes (e.g., at ~12, ~22, ~38, ~110, ~173, and ~182 mcd in Fig. F4). Thus, the mcd values of the different holes will approximate but not precisely correspond to the same stratigraphic horizon in alternate holes.
The P/E boundary interval in the composite was taken from Core 208-1262B-15H (140.17 mcd), and the K/P boundary interval in the composite was taken from Core 208-1262C-13H (216.75 mcd). The Site 1262 splice (Table T3) can be used as a guide to sample a single sedimentary sequence between 0 and 236 mcd and was used to plot other data sets from this site. The mcd to mbsf growth factors for Holes 1262A, 1262B, and 1262C were 11%, 11%, and 13%, respectively (Fig. F5).