Figure F124. Thin section photomicrograph of a characteristic texture from zone 2 in the upper sill. Lath-shaped plagioclase crystals are enclosed in segregations of devitrified glass (intersertal texture), and other plagioclase lath-shaped crystals enclose augite minerals in an intergranular texture (Sample 210-1276A-88R-5, 104-109 cm). A. Plane-polarized light. B. Cross-polarized light.

Figure F124. Thin section photomicrograph of a characteristic texture from zone 2 in the upper sill. Lath-shaped plagioclase crystals are enclosed in segregations of devitrified glass (intersertal texture), and other plagioclase lath-shaped crystals enclose augite minerals in an intergranular texture (Sample 210-1276A-88R-5, 104-109 cm). A. Plane-polarized light. B. Cross-polarized light.