Previous research is reviewed, and additional experimental data are presented. An analysis of pressure vs. moisture content curves for these sediments has lead to the overall conclusion that upward deviations of the curve from linearity are caused by the squeezing out of non-oriented water first. These deviations occur at pressures corresponding to about 20-25 percent remaining moisture content for kaolinite, and about 50-70 percent for montmorillonite, that is, at pressures where the chemistry of the squeezed-out solutions begins to change appreciably. The experimental results also indicate that the salinity of the interstitial solutions in shales should be less than that of water in associated sandstones, assuming that water was squeezed from the shale into the sandstone.

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