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Figure 5.1. Mercury injection capillary pressure curves, pore size distribution, and photomicrographs for representative samples from the HST part of the Lewis Shale, Sierra Madre outcrop, together with log of stratigraphic interval and positions of samples. Samples are from microfacies 2 (moderately to very silty calcareous shales) and microfacies 5 (very silty shales and mottled argillaceous siltstones).