Figure F20. Photographs of gray halos. A. Mixed gray halo with an outer 8 mm dark gray halo and an inner 4 mm pale gray halo (interval 327-U1362A-3R-2 [Piece 8, 79–84 cm]). B. Dark gray rock halo as wide as 40 mm (interval 327-U1362A-14R-1 [Piece 1, 1–14 cm]).
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