The principal result at this site was identifying ultramafic rocks that lie beneath a shallow east dipping strong intrabasement reflector overlain by metagabbros, tonalite gneisses, amphibolites, and meta-anorthosites sampled at Sites 1067 and 900. These consist of a lower turbiditic calcareous sandy siltstone and calcareous claystone capped by a hemipelagic claystone. In Subunit IIC, the upward-darkening sequences are up to 45 cm thick and are largely dominated by nannofossil claystones and nannofossil chalks. Biostratigraphically, the calcareous claystone section of lithostratigraphic Unit II is essentially continuous and its age ranges from middle Eocene to Maastrichtian.
Planktonic foraminifers are variable in preservation and abundance.
Toward the base of Unit IV, the matrix is more chloritic and the breccias are increasingly overprinted by brittle deformation, cataclasis, and hydrothermal alteration, and rest along a tectonized contact. There is strong circumstantial evidence to suggest the hole penetrated a seaward-dipping normal fault at this depth. Headspace gas samples from the serpentinite and serpentinite breccia contain as much as 6000 ppm methane and 1.2 ppm ethane, with no other detectable hydrocarbons. Such anomalously high methane values are probably a result of the process of serpentinization. This foliation is overprinted by fractures filled with serpentine and chlorite.