...with a few irregular vesicles, and slight evidence of pneumatolysis. Less brecciation than in No.l, and more evidence of viscous flow. 3. Albite-magnetite-quartz-magma,...smoothwalled vesicles, and evidence of the presence of magmatic water. Still further diminished viscosity, brecciation practically absent, and flow-structures...

...hydro-pneumatolysis played an important minor rôle. This accords, to a great extent, with the views of 3. Albite-magnetite-quartz-magma, with abundant smoothwalled vesicles, and evidence of the presence of magmatic water. Still further diminished viscosity, brecciation practically absent, ind flow-structures...