Figure F26. Close-up photograph of elongate amygdules (up to 5 mm) that are aligned, defining a flow structure in Unit 45. Plagioclase phenocrysts are clay altered but clearly recognizable in hand specimen. Locally, slightly rounded quartz-rich patches are hosted within the volcanic groundmass. The origin of these patches is enigmatic, and they may represent xenoliths, amygdules, or alteration features (interval 193-1188F-17Z-1, 0-12 cm).

Figure F26. Close-up photograph of elongate amygdules (up to 5 mm) that are aligned, defining a flow structure in Unit 45. Plagioclase phenocrysts are clay altered but clearly recognizable in hand specimen. Locally, slightly rounded quartz-rich patches are hosted within the volcanic groundmass. The origin of these patches is enigmatic, and they may represent xenoliths, amygdules, or alteration features (interval 193-1188F-17Z-1, 0-12 cm).