Figure F44. The interpretative summary diagram for Site 1139 shows the 19 igneous units that range from basalt to rhyolite and from bioclastic sandstone to volcaniclastic breccia. In general, the primary vesicularity of the lava flows and marginal breccias is obscured by the effects of alteration. Sanidine xenocrysts are distributed throughout the more mafic flows. Although changes in K concentration from downhole natural-gamma measurements correlate generally with the defined igneous units, the logging data show more complexity indicating unrecovered changes in lithology.