Figure F64. Breccia, comprising flow-banded, green silica-clay-altered, soft, white to light greenish-gray volcanic clasts, which are hosted in a quartz-rich cement. Note the pale, incipiently silicified margins of the clasts. Coarse anhydrite crystals are present as late vug fill in the clasts and matrix (Unit 23; interval 193-1189B-14R-1, 76-85 cm).