Figure F20. Close-up photograph of interval 183-1138A-77R-1, 10-25 cm, showing the lower part of the massive, green, clay-rich, altered pumice breccia (basement Subunit 2C) and upper orange part of pumice lithic breccia (basement Subunit 2D). Note the clay pseudomorphs (arrows) of pumice in the pale green, altered pumice breccia interval.