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Figure F11. Gamma ray and resistivity logs, core and logging porosities, and in situ pressures at M.C. 810 Ursa geotechnical well #1 (located in Fig. F9). The Blue Unit (light gray bars) lies between 300 and 550 mbsf and is composed of interbedded sandstone and mudstone layers. Core porosity ( core) declines rapidly with depth to 200 mbsf and thereafter is constant. Overpressure (P* = P Ph) is plotted; thus the vertical axis is hydrostatic pressure (Ph) and the right boundary of the plot is the reduced lithostatic pressure (v* = v Ph). Circles = piezoprobe pressures, triangles = preconsolidation pressures from uniaxial consolidation tests of core, stars = pressure measurements inferred from pressure while drilling (PWD) in the Blue Unit. Ostermeier et al. (2000) and Eaton (1999) further describe these data.