Figure 1. Shipboard velocity measurements at Sites 897, 898, 899, and 900 (plus symbols). The dashed line indicates the results from sonobuoy Line 1 reported by Whitmarsh et al. (1990). The high velocities between 620 and 670 mbsf are from lithified samples in lithostratigraphic Subunit IIIB and Unit IV at the top of the basement high beneath Site 897.