Figure F21. A. Photomicrograph, with crossed polars, of Sample 187-1161A-4R-1, 65-68 cm (see "Site 1161 Thin Sections"), showing thin silica and clay layers surrounding basaltic clasts in basaltic breccia. B. Photomicrograph in plane-polarized light of Sample 187-1161A-4R-1, 65-68 cm (see "Site 1161 Thin Sections") (same field of view as A), showing Mn oxide lining voids in basaltic breccia.