Figure F12. A. Photomicrograph, with crossed polars, of Sample 187-1161A-4R-1, 65-68 cm (see "Site 1161 Thin Sections"), showing clasts loosely cemented by cryptocrystalline silica and/or clay (birefringent material outlining clasts) in basaltic breccia matrix. B. Same view as A but in plane-polarized light, showing the partial filling of primary void space with Mn oxides.