During Leg 7, between Guam and Honolulu, a total of seven sites in four geologic provinces was drilled. The first site was in the Marianas Basin, east of the Trench; three sites along a line parallel to the equator and in the Caroline -- Ontong-Java region; two within the Central Basin; and one on the Hawaiian Arch, north of Oahu. The core from Hawaii showed consolidated and bedded volcanic sandstone and mudstone, and dark brown clay for 60 m where a layer of hard brown chert stopped the bit. Only about half of the total column, as inferred from seismic profiles, was penetrated.