The FMS image shows a claystone layer at the base of the limestone, which is about 8 cm thicker than the recovered claystone deposit. We propose that this represents the portion of the boundary deposit that was not recovered. On the far right is magnetic susceptibility log of the recovered core. Summary of correlations between seismic stratigraphy, depths, logging units, lithologic units, and ages at Site 1000. Correlations with the reflection seismic record were constrained by calculations of two-way traveltime versus depth derived from compressional velocities measured by downhole logging and laboratory instruments.
Velocities shown are averages derived from the downhole sonic tool within each major logging unit.
Alkalinity in Site 1000 interstitial waters compared to bulk calcium carbonate contents of sediment. Arrow indicates mean ocean bottom water sulfate composition. Summary of correlations between seismic stratigraphy, depths, logging units, lithologic units, and ages at Site 1001. An approximately 2-km portion of EW9417 SCS line 10 is displayed with a vertical exaggeration of 10x. Note that the dark specks on the surface of the upper Maastrichtian limestone are smectite particles that have been eroded from the basal part of the boundary deposit during drilling.