Figure F21. Graphic logs illustrating the characteristic structures of pahoehoe lobes in the Unit 23 compound pahoehoe lava at Site 1203. A. Lobe showing the threefold subdivision into vesicular upper crust, massive lobe interior, and vesicular lower crust. B. Lobe that is vesicular throughout, but coarsely vesicular in the center and finely vesicular near the margins. HVS = horizontal vesicle sheet, VC = vesicle cylinders, PV = pipe vesicles.

Figure F21. Graphic logs illustrating the characteristic structures of pahoehoe lobes in the Unit 23 compound pahoehoe lava at Site 1203. A. Lobe showing the threefold subdivision into vesicular upper crust, massive lobe interior, and vesicular lower crust. B. Lobe that is vesicular throughout, but coarsely vesicular in the center and finely vesicular near the margins. HVS = horizontal vesicle sheet, VC = vesicle cylinders, PV = pipe vesicles.