Figure F32. Typical textures of massive lavas and thin sheet flows. A. Interior of massive lava (interval 206-1256C-10R-4, 1–14 cm). B. Glassy margin of thin sheet flow in basement Unit 1256D-2 (interval 206-1256D-13R-3, 25–33 cm). Note the horizontal planar shape to glassy margin and parallel vesicle horizon just below the margin.