Below 371 mbsf, the intense fissility, fracture networks, and stratal disruption disappear, and evidence for torque transfer to the cores decreases markedly. Burrows, a primary sedimentary structure, are common. Mud-filled veins are present. Steep bedding dips are measured in the interval 420 to 484 mbsf. At 460 mbsf, microfaulting is more abundant in the cores, and fluid escape breccias were noted.
Minor faults occur through the cores to the base of the section.
Incipient stylolitization is present in the lowest 10 m of the sediment section, developed largely subhorizontally, and rare boudinage structures are present. The distribution of ages vs. depth at Site 1040 for Units U1, U2, and U3 is similar to that of Site 1039. The major difference between the two sites is the difference in thickness of the corresponding units. These differences correspond well with measured differences in porosity and bulk density between the two sites. Post-cruise work should shed more light on these differences.