Figure 17. The basal interval of Subunit IIIB. The fractured limestone clast at 31 cm marks the base of the second interval of the upward-fining conglomerate/coarse sandstone sequence illustrated in Figure 16. The orange gray (10YR 7/4,6/4) nannofossil claystone/nannofossil chalk occurs in discrete rounded pieces that are possibly sedimentary clasts (Interval 149-897C-62R-4, 30-50 cm).