The high gamma-ray counts and low density indicate dominant clayey sediments in this interval. The tops of these two intervals are marked by a contact surface dipping 50 degrees to the west. Between these two intervals the FMS maps a succession of fractures dipping the same direction at about 50-70 degrees. The sharp decrease in potassium above 292 mbsf can be interpreted as the result of fault controlled hydrothermal circulation and alteration. This unit is characterized by a progressive reduction in gamma-ray counts and an increase in resistivity, density, and sonic velocity.
Some fractures dipping east are possibly conjugate to the main fault.
At 323 mbsf, an increase in density, resistivity, and velocity, and a decrease in gamma-ray counts are interpreted to indicate a higher proportion of sand. The beds are thicker but display similar dips and azimuths. The occurrence of sills correlates with a strong increase in density, sonic velocity, and resistivity, and a drop in porosity and gamma-ray counts. Four sills are identified in the logs, their thicknesses varying between 2 and 6 m. FMS images suggest that some of these units may be pillow lava flows. The deepest part of the FMS record images pillow basalt between 471 mbsf and the bottom of the hole.