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<br />W <br />I- <br />~ <br />l'\,) <br /> <br />Summary <br /> <br />Although many factors can contribute to salinity on the Mancos-Shale <br />terrain, the major factor is the presence of soluble minerals ,that were <br />precipitated as the Mancos Shale was deposited. The most important <br />soluble mineral is gypsum. <br />Empirical relations between salinity (SC) and conductance (EC) have <br />been developed that permit rapid and inexpensive determination of <br />salinity and SM:: of each material. However, care must be taken when <br />determinations of SMC of sediment samples are made. Laronne (1977) <br />demonstrated that in order to obtain an accurate measurement of SM::, <br />dilute solutions must be used and longer periods of sediment-water <br />contact are required before equlibrium can be obtained. This also <br />implies that in the field EC measurement may be misleading as gypsum and <br />calci te particles may be transported as sediment particles rather than <br />in solution. <br /> <br />30 <br />