Multisensor track (MST) and spectral reflectance (L*) data collected from Holes 1211A, 1211B, and 1211C were used to determine depth offsets in the composite section. Magnetic susceptibility, gamma ray attenuation (GRA) bulk density, and spectral reflectance measurements were the primary parameters used for core-to-core correlation. GRA bulk density and magnetic susceptibility data were collected at 3-cm intervals and spectral reflectance data were collected at 2.5-cm intervals on all cores (see "MST Measurements" in "Physical Properties" and "Lithostratigraphy" for details about MST and spectral reflectance data).
The data used to construct the composite section and determine core overlaps are presented in a composite depth scale in Figure F13. The depth offsets that comprise the composite section for Holes 1211A, 1211B, and 1211C are given in Table T6. Units for the composite depth scale are meters composite depth.
The composite data show that the APC cores from Site 1211 provide a continuous overlap to at least 160 mcd (K/T boundary; ~147.8 mcd in Core 198-1211A-15H). Below the uppermost Maastrichtian, most of the cores from Holes 1211A, 1211B, and 1211C could not be correlated and placed into a composite depth framework because of a low signal amplitude. Expansion of sedimentary features in one hole relative to coeval cores in the other hole indicate distortion of the cored sequence. Because some distortion occurred within individual cores on depth scales of <9 m, it was not possible to align accurately every feature in the MST and color reflectance records by simply adding a constant to the mbsf core depth.
Following construction of the composite depth section for Site 1211, a single spliced record was assembled for the aligned cores over the upper 160 mcd by using cores from all holes. Intervals having significant disturbance or distortion were avoided. The PETM interval in the composite was taken from Core 198-1211A-13H.
In the uppermost part of the holes, magnetic susceptibility and GRA density patterns are clearly repeated, indicating that several meters of sediment were recovered twice within a single hole (Fig. F14). This caused overlap of data from successive cores in multiple locations on the order of ~3 m. The Site 1211 splice (Table T7) can be used as a guide to sample a single sedimentary sequence between 0 and 160 mcd and can be used to plot other data sets from this site.