Site 1222 extended to a total depth of 98.15 mbsf (Core 199-1222A-12X), with good recovery down to a depth of 71.13 mbsf (Core 199-1222A-8H). Below this depth, only chert and basalt were recovered. Similar to Site 1221, cores recovered from Site 1222 frequently showed evidence of flow-in, attributed to strong heave motions during coring. The predominantly clay and radiolarian clay found at Site 1222 showed signs of significant expansion during coring, which resulted in longer than average gaps between consecutive cores. Thus, although overlap between the two adjacent drilled holes was good, it was difficult to generate a complete and continuous record.
A composite section was constructed for the upper 80 mcd of Site 1222 using multisensor track (MST) and color reflectance data to determine depth offsets between cores from Holes 1222A and 1222B (Fig. F8). Magnetic susceptibility (MS), P-wave velocity, natural gamma ray (NGR), and color reflectance data were collected at 2-cm intervals and GRA bulk density at 4-cm intervals in all APC cores. Disturbed intervals, as determined by visual inspection of split cores, are listed in Table T4. Data from these intervals were removed prior to correlation work. Table T5 lists the offsets that were applied to cores from each hole to create a composite depth record.
It was possible to construct a continuous spliced record from Site 1222 down to the base of Core 199-1222A-4H (34.44 mbsf; 37.88 mcd), below which it was possible to align most cores from the two drilled holes to each other but without continuous overlap. As many intervals in Hole 1222B showed flow-in and had to be removed prior to correlation, data from below Core 199-122A-4H were merely appended to the splice. Exceptions to this are Cores 199-1222A-7H and 199-1222B-7H, which showed good overlap and allowed the splicing of an additional ~13 m from ~59 to 72 mcd.
Figure F9 shows the resulting spliced records for GRA bulk density, MS, and color reflectance (splice tie points for Site 1222 are given in Table T6). The unusual MS profile bears resemblance to that obtained from Site 1215. Together with age control provided by biostratigraphic datums (see "Biostratigraphy"), this might allow further correlation between sites.