Aphyric basalt with rare, poorly formed Olivine microphenocrysts.
Plagioclase is the only phase recognizeable in the glassy to cryptocrystalline groundmass.
Two different "Domains" are present - Domain 1 is sparsely vesicular and contains relatively fewer
Plagioclase laths and relatively more glass than the non-vesicular Domain 2. The less crystalline Domain 1 represents a gas-driven melt segregation from the basalt part of the flow after 35%-50% crystallization that has migrated into the main part of the lava flow.
