Figure F16. Photomicrographs showing plagioclase phenocrysts. A. Plagioclase megacryst with inclusion of olivine (Sample 197-1205A-15R-2, 138-140 cm) (cross-polarized light; field of view = 5 mm; photomicrograph 1205A-211). B. Rounded plagioclase phenocry

Figure F16. Photomicrographs showing plagioclase phenocrysts. C. Compositional zonation in a plagioclase phenocryst from Subunit 8a (Sample 197-1205A-20R-5, 67-68 cm) (cross-polarized light; field of view = 1.25 mm; photomicrograph 1205A-216). D. Strain lamellae in a plagioclase megacryst (Sample 197-1205A-11R-1, 73-75 cm) (cross-polarized light; field of view = 5 mm; photomicrograph 1205A-204).