A total of 75 samples were taken at 30-cm intervals from Cores 186-1151C-1H through 3H. The subbottom depth (in a modified meters below seafloor [mbsf*] depth scale; equation shown in Table T1) for each sample was corrected for the effect of core expansion when core recovery exceeds 100%.
Currently, only a crude age model is available, but comparison of the magnetic susceptibility profile of Leg 186 cores with that of nearby core LM 8 (Yamane and Oba, 1999) suggests that the studied interval (0 to ~21.0 mbsf*) covers the last 150 to 200 k.y. The uppermost datum level, which is based on occurrences of diatoms in the Hole 1151C core is at ~21.44 to ~26.43 mbsf, which corresponds to 0.3 Ma (Sacks, Suyehiro, Acton, et al., 2000). This is basically consistent with our age model, based on comparison of the magnetic susceptibility profile of Leg 186 cores with that of nearby core LM 8.