Figure F41. Unit 35 is a polymict volcaniclastic breccia and contains some clasts with well-preserved, densely packed spherulites impinging on each other. These radiating aggregates of quartz and feldspar crystals are, however, locally replaced by micropoikilitic quartz (Sample 193-1189B-18R-2, 65-67 cm, in cross-polarized light; width of view = 1.38 mm. Photomicrograph ID# 1189B_43; thin section 140).