Figure F6. Color close-up photograph of interval 183-1136A-10R-1, 80-90 cm, showing the base of the massive brown zeolitic calcareous volcanic clayey sand from lithologic Unit IV. The presence of 10%-15% palagonitized glass shards imparts the brown color. Note the subrounded basaltic pebble in this interval. Below the sand is a piece of brown and white silicified mafic volcanic breccia with clasts that are internally brecciated.