Figure 38. Photomicrograph of glomerophyric clasts of phenocrysts (here, plagioclase, clinopyroxene, and magnetite) and a nearby microvesicle, which are a common feature of Unit 1. Interstitial spaces around these aggregates typically consist of microlite-free volcanic glass (Sample 193-1190B-2R-1 [Piece 7, 40–43 cm]; field of view = ~1.8 mm).