MST and spectral reflectance (L*) data collected from Holes 1210A and 1210B were used to determine depth offsets in the composite section. Magnetic susceptibility, 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 F15. The depth offsets that comprise the composite section for Holes 1210A and 1210B are given in Table T7. Units for the composite depth scale are mcd.
The composite data show that the APC cores from Site 1210 provide a continuous overlap to at least 260 mcd (K/T boundary; 244 mcd in Core 198-1210A-23H). Below the uppermost Maastrichtian, most of the cores from Holes 1210A and 1210B could not be correlated and placed into a composite depth framework. 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 accurately align 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 1210, a single spliced record was assembled for the aligned cores over the upper 260 mcd by using cores from both holes. Intervals having significant disturbance or distortion were avoided. The PETM interval in the composite was taken from Core 198-1210B-20H. Magnetic susceptibility data from both holes for the middle Miocene-lower Oligocene unconformity interval are shown in Figure F16. The Site 1210 splice (Table T8) can be used as a guide to sample a single sedimentary sequence between 0 and 260 mcd and can be used to plot other data sets from this site.