Figure 2. A. Petrographic thin section of glass from the basalt breccia, Sample 168-1026B-3R-1, 16-24 cm. A 10-µm-wide fracture filled with yellow clay runs diagonally through the photo. Volcanic glass on either side of the fracture contains microlites. The fracture is surrounded by regions of alteration that extend 10-50 µm into the glass. The boundary between the alteration and the glass is marked by dark zones about 2 µm thick. A color version of this figure is available in PDF format on the volume CD-ROM. B. Scanning electron micrograph of clay surface in Sample 168-1026B-3R-1, 16-24 cm. Cells are clustered on the surface of clay from an interior surface of the sample. The flattened, dimpled shapes of the cells are due to air drying.

Figure 2. A. Petrographic thin section of glass from the basalt breccia, Sample 168-1026B-3R-1, 16-24 cm. A 10-µm-wide fracture filled with yellow clay runs diagonally through the photo. Volcanic glass on either side of the fracture contains microlites. The fracture is surrounded by regions of alteration that extend 10-50 µm into the glass. The boundary between the alteration and the glass is marked by dark zones about 2 µm thick. B. Scanning electron micrograph of clay surface in Sample 168-1026B-3R-1, 16-24 cm. Cells are clustered on the surface of clay from an interior surface of the sample. The flattened, dimpled shapes of the cells are due to air drying.