Figure F10. Photomicrograph in plane-polarized light of Sample 187-1161A-4R-1, 65-68 cm (see "Site 1161 Thin Sections"), showing angular feldspar clasts and a chilled margin fragment (now totally altered to clay minerals) within basalt breccia matrix. Note the presence of Mn oxide concretions and small (sand-sized) basalt clasts.