Figure F38. Flow banding in several units is commonly defined by aligned, coalesced spherulites forming "necklace-like" domains with bulbous margins. The spherulites are altered and consist of very fine grained, light gray to brown clay and quartz, which commonly occupies the central part (Unit 14; Sample 193-1189B-10R-1, 57-60 cm; width of view = 2.75 mm. Photomicrograph ID# 1189B

Figure F38. Flow banding in several units is commonly defined by aligned, coalesced spherulites forming "necklace-like" domains with bulbous margins. The spherulites are altered and consist of very fine grained, light gray to brown clay and quartz, which commonly occupies the central part (Unit 14; Sample 193-1189B-10R-1, 57-60 cm; width of view = 2.75 mm. Photomicrograph ID# 1189B_30; thin section 121).