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Figure 4.1. Mercury injection capillary pressure curves, pore size distribution, photomicrographs, and SEM photographs for representative core samples, from the TST part of the Lewis Shale, in Champlin 276 D-1, together with section of well log that shows calibrated cored interval and positions of samples. Samples are from microfacies 1 (finely laminated, pyritic, black shales) and microfacies 4 (fossiliferous, slightly to moderately silty claystones).