Figure F22. Close-up photograph of interval 183-1138A-77R-CC, 0-8 cm, showing sharp (scoured) upper contact at the granular base of the lithic breccia (basement Subunit 2E) over a normally graded accretionary lapilli-bearing pyroclastic ash-fall deposit (basement Subunit 2F). Note that this interval mantles large pumice clasts at the top of the underlying pumice lithic breccia (basement Subunit 2G).