Figure F20. Holocrystalline fine-grained gabbroic xenolith in an aphyric microcrystalline basaltic sheet flow (Subunit 1256D-35c) (interval 309-1256D-108R-1, 30–36 cm). The xenolith consists of olivine, plagioclase, and clinopyroxene minerals. Cavities within the xenolith are filled with the aphyric microcrystalline basalt of the host rock.