Figure 15. Light-colored sandy siltstone and sandy claystone at the top of Subunit IIIB. The sand-sized fragments in this thin interval include highly altered basaltic clasts, which suggests that it is altered volcanic ash (Interval 149-897C-62R-1, 40-55 cm).

Figure 15. Light-colored sandy siltstone and sandy claystone at the top of Subunit IIIB. The sand-sized fragments in this thin interval include highly altered basaltic clasts, which suggests that it is altered volcanic ash (Interval 149-897C-62R-1, 40-55 cm).