Figure 10. Subunit IIIB. Small-scale variations within clay-rich lithologies include white claystone (55.5-61 cm, possible volcanic ash?), moderate brown claystone with black concretions, and bioturbated dusky yellow claystone (61-66 cm), all overlying dark reddish brown clayey conglomerate (Interval 149-899B-15R-4, 55-75 cm).

Figure 10. Subunit IIIB. Small-scale variations within clay-rich lithologies include white claystone (55.5-61 cm, possible volcanic ash?), moderate brown claystone with black concretions, and bioturbated dusky yellow claystone (61-66 cm), all overlying dark reddish brown clayey conglomerate (Interval 149-899B-15R-4, 55-75 cm).