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In Turkey in the Tuncbilek coal basin, the subject area of this study, there are gray and brown colored marl formations. As known, the test specimens shall be conditioned in such a way as to be reached to the natural water content before the strength tests, and it is preferred to use the saturated specimen in order to be representative for levels below the groundwater. It is noticed that the gray marl core samples taken from Tuncbilek were broken into parallel slices by the influence of water in less than half an ...