Figure F51. Dynamic and static Formation MicroScanner (FMS) image and NGR logs across the lithologic Unit III/IV boundary that was placed at a 1-cm-thick layer of grainstone with a sharp contact at 177 mbsf. This boundary coincides with a thin highly resistive layer capping a lower resistive bed on the FMS log. The layer also marks the change in bedding character from thin-bedded and highly resistive strata below to thick-bedded and more conductive strata above.