Figure F20. Reflected-light photomicrographs of titanomagnetite (gray-brown) showing variable degrees of replacement by maghemite (light gray-blue) throughout the basement sequence at Site 1204. A. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.625 mm; photomicrograph 1204A-114). B. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.625 mm; photomicrograph 1204A-115). C. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.25 mm; photomicrograph 1204A-125). D. Sample 197-1204B-8R-3, 53-55 cm (field of view = 1.25 mm; photomicrograph 1204B-137). E. Sample 197-1204B-8R-3, 53-55 cm (field of view = 0.625 mm; photomicrograph 1204B-141). F. Sample 197-1204B-2R-4, 87-89 cm (field of view = 0.625 mm; photomicrograph 1204B-148).

Figure F20. Reflected-light photomicrographs of titanomagnetite (gray-brown) showing variable degrees of replacement by maghemite (light gray-blue) throughout the basement sequence at Site 1204. A. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.625 mm; photomicrograph 1204A-114). B. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.625 mm; photomicrograph 1204A-115). C. Sample 197-1204A-9R-2, 50-51 cm (field of view = 0.25 mm; photomicrograph 1204A-125). D. Sample 197-1204B-8R-3, 53-55 cm (field of view = 1.25 mm; photomicrograph 1204B-137). E. Sample 197-1204B-8R-3, 53-55 cm (field of view = 0.625 mm; photomicrograph 1204B-141). F. Sample 197-1204B-2R-4, 87-89 cm (field of view = 0.625 mm; photomicrograph 1204B-148).