Figure F30. Photomicrograph of Sample 183-1138A-82R-3, 49-51 cm, showing in situ brecciation textures at the margin of a chilled clast. The sediment enclosing this clast has been altered and silicified to clay minerals and quartz, and primary textures have been obliterated. Field of view = 1.4 mm (plane-polarized light).