Hole 1216A extended to a depth of 55.66 mbsf. Cores 199-1216A-5H through 11X were highly disturbed and recovered mostly chert fragments. Only one core was recovered from Hole 1216B, after which Site 1216 was abandoned. Therefore, it was not possible to generate composite depth or spliced records for Site 1216. Here, we present a comparison of cleaned and culled Site 1216 MST and color reflectance data to spliced records from Site 1215.
MST and color reflectance data were collected from Holes 1216A and 1216B. MS, P-wave velocity, and color reflectance data were collected at 2-cm intervals and gamma ray attenuation (GRA) bulk density at 4-cm intervals on all cores recovered from Holes 1216A and 1216B (see "Physical Properties" and "Lithostratigraphy" for details about MST and color reflectance data). Cores 199-1216A-5H through 11X recovered mostly chert fragments, and MST data from these cores are unreliable. Table T4 lists intervals from Holes 1216A and 1216B that are interpreted to be disturbed and are excluded from further discussion.
Figure F8 illustrates the MST and color reflectance data from Site 1216 on an mbsf depth scale after culling intervals given in Table T4. On the basis of MST and color reflectance data alone, it is not possible to reliably determine a depth offset between Hole 1216A and 1216B. The MS data from Hole 1216B have different absolute values, most likely attributable to core disturbance in the upper intervals of both holes. Compressional wave-velocity data from both holes exhibit an apparent 1.5-m cyclicity directly correlatable to the 1.5-m section breaks within the cores. The cyclicity is an artifact of the core-sectioning process that results in a reduction of porosity toward the ends of core sections. Paleomagnetic intensity data suggest, however, that Hole 1216A should probably be offset downward with respect to Hole 1216B by ~3 m (see "Paleomagnetism").
At Site 1216, the MST-NGR data (Fig. F8) have a trend that is very similar to that expressed at Site 1215. Based on the NGR and MS data, an attempt was made to correlate MST data recovered from Site 1216 with those from Site 1215. The correlation of data between Sites 1215 and 1216 was performed using the software package Analyseries (version 1.2) (Paillard et al., 1996). The strategy chosen was to maximize the fit between the MS data from Site 1216A and the spliced records from Site 1215, also taking into consideration paleomagnetic data that suggest a reversal in polarity at ~10 mbsf in Hole 1216A can also be identified at ~2 mbsf in Hole 1215A (2.8 meters composite depth [mcd]). Data points from Hole 1216A were linearly interpolated between these ties. The resulting match can be evaluated in Figure F9, which also shows the location of tie points and their corresponding depth. The points at which data from both sites were matched are also given in Figure F9. With respect to the mcd scale of Site 1215, the linear sedimentation rate (LSR) of Hole 1216A (on an mbsf scale) is approximately a factor of 1.6 greater to a depth of 22 mbsf and approximately similar to that of Site 1215 from 22 to 37.5 mbsf in Hole 1216A (Fig. F9).