The thermal conductivity measurements made during Leg 166 were limited to relatively shallow, unconsolidated sediments. To better constrain the thermal properties of deeper sediments, we measured thermal conductivities of 14 lithified samples from Holes 1003C, 1005C, and 1007C using the divided-bar method after the cruise (Table 1). The technique of the divided-bar conductivity measurement has been described previously by a number of authors (e.g., Birch, 1950; Carslaw and Jaeger, 1959, p. 139; Turcotte and Schubert, 1982, p. 135; Lewis, 1975). We used the apparatus at the Pacific Geoscience Centre, Geological Survey of Canada, Sidney, British Columbia. Each sample was prepared to be in cylindrical shape of 24.9-25.4 mm in diameter and 14-32 mm in thickness. The planar top and bottom surfaces of the samples were made as smooth as possible to achieve good thermal contact with the divided bar. The samples were soaked in water for ~24 hr before the measurements. The apparatus was calibrated using fused quartz discs of the same diameters but different thicknesses. The conductivity measurements were repeatable within 5%.