Figure F28. Photomicrograph showing large resorbed plagioclase grain that is optically discontinuous (Sample 209-1275B-21R-3, 28–30 cm) (field of view = 11 mm). A. plane-polarized light: blue + dark gray filters; image 1275B_043. B. cross-polarized light: blue filter + gypsum plate; image 1275B

Figure F28. Photomicrograph showing large resorbed plagioclase grain that is optically discontinuous (Sample 209-1275B-21R-3, 28–30 cm) (field of view = 11 mm). A. plane-polarized light: blue + dark gray filters; image 1275B_043. B. cross-polarized light: blue filter + gypsum plate; image 1275B_041.