Figure F24. Close-up photograph of interval 183-1138A-79R-3, 26-47 cm, showing sharp upper erosional (scoured) contact of normally graded accretionary lapilli-bearing pyroclastic ash-fall material (basement Subunit 2L) and the granular base of the overlying reversely graded lithic breccia (basement Subunit 2K). Accretionary lapilli are visible only in the dry archive-half image (see Fig. F23).