Figure F59. Photomicrographs of two siliciclastic intervals from Unit 4. A. From the top of the unit, in cross-polarized light. Large subangular plutonic clast composed of quartz (Q; white) and zoned, slightly sericitized feldspar (F; shades of gray) is set in a hematitic muddy matrix (Sample 210-1276A-25R-6, 73-77 cm). B. From the middle of the unit, showing the base of a sandy turbidite bed in abrupt contact with underlying darker mudstone. The turbidite has large grains of quartz (Q; white) and glauconite (G; green) in a finer sandy matrix. The texture is bimodal (Sample 210-1276A-27R-6, 11-14 cm).

Figure F59. Photomicrographs of two siliciclastic intervals from Unit 4. A. From the top of the unit, in cross-polarized light. Large subangular plutonic clast composed of quartz (Q; white) and zoned, slightly sericitized feldspar (F; shades of gray) is set in a hematitic muddy matrix (Sample 210-1276A-25R-6, 73-77 cm). B. From the middle of the unit, showing the base of a sandy turbidite bed in abrupt contact with underlying darker mudstone. The turbidite has large grains of quartz (Q; white) and glauconite (G; green) in a finer sandy matrix. The texture is bimodal (Sample 210-1276A-27R-6, 11-14 cm).