Figure F13. Stratigraphic section of the volcaniclastic succession in basement Unit 2 (Hole 1138A). Grain-size distribution is indicated by the width of the column, with clay (C), silt (Z), sand (S), granule (G), and pebble (P) fields represented. Core and section information is shown in italics. Depth in mbsf is noted for the top of each section. Lava-flow unit numbers (Subunit 2A through Subunit 2O) are shown in boxes. Lava-flow Subunit 2B shows a poorly sorted interval in reworked sediments. Note that the range of pumice clast sizes (designated by altered pumice breccia pattern) is much greater than the range of lithic clast sizes.