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Figure F29. Photomicrograph of glauconitic, silty very fine sand with dark brown organic grains or muddy materials, scattered framboidal pyrite grains, and some opaque minerals (Unit VIIB; Sample 313-M0027A-177R-1, 41 cm). Black small spherule grains of framboidal pyrite are scattered. Different colored glauconite grains may reflect maturity differences. Photo under crossed polars is 0.7 mm (700 µm) wide.

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