Figure F11. Photomicrographs of Sample 198-1213B-27R, 74-76 cm, showing possible microbial structures enclosed in quartz crystal cement within the breccia pictured in Figure F10. The upper view is in plane-polarized light, and the lower view is with nicols crossed.

Figure F11. Photomicrographs of Sample 198-1213B-27R-1, 74-76 cm, showing possible microbial structures enclosed in quartz crystal cement within the breccia pictured in Figure F10. The upper view is in plane-polarized light, and the lower view is with nicols crossed.