MST and spectral reflectance (L*) data collected from Holes 1209A, 1209B, and 1209C 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 2.5-cm (Hole 1209A) and 3-cm (Holes 1209B and 1209C) intervals on all APC cores, and at 3-cm intervals on two XCB cores from Hole 1209A. Spectral reflectance data were collected at 2.5-cm intervals on all cores from Site 1209 (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 F19. The depth offsets that comprise the composite section for Holes 1209A, 1209B, and 1209C are given in Table T6. Units for the composite depth scale are mcd.
The composite data show that the APC cores from Site 1209 provide a continuous overlap to at least 260 mcd (K/T boundary; e.g., in Core 198-1209C-15H). Below the K/T boundary, most of the cores from Holes 1209B and 1209C could not be correlated and placed into a composite depth framework.
Following construction of the composite depth section for Site 1209, a single spliced record was assembled for the aligned cores over the upper 260 mcd by using cores from all three holes. Intervals having significant disturbance or distortion were avoided. 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. The K/T boundary interval in the composite was taken from Core 198-1209C-15H. Magnetic susceptibility data from the three holes for the Eocene/Oligocene boundary and Paleocene/Eocene boundary intervals are shown in Figures F20 and F21. The Site 1209 splice (Table T7) can be used as a sampling guide to recover a single sedimentary sequence between 0 and 260 mcd and can be used to plot other data sets from this site.