Sedimentation dependence on pore fluid chemistry for UBGH2-2-2B 11H-4 (Depositional interface, open symbols; Accumulation interface, solid symbols). The sedimentation pattern is typical of diatoms, which will settle rapidly even when the pore fluid salinity is low (e.g., rapid settling for the DWS specimen, blue circles, for which the fluid is deionized water with only the salt left over from the initial drying of the samples after collection in 2009).