For interstitial waters, the mudline wash core taken as Hole 801D was sampled at a frequency of one 5-cm whole-round sample per section of the core for a total of six samples. The chemical analyses of these samples indicate that the composition of the interstitial water in the core is very similar to that of inferred bottom water (Table T14). Considering that the core was an RCB push core compressing as much as several tens of meters of sediment into the core liner, advection and mixing of the interstitial fluids is likely responsible for the essentially constant composition with depth. Headspace gas was not measured in this core.