Figure F11. 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 basalt breccia matrix. Note the angular shapes and abundance of feldspar clasts. Partial alteration of some plagioclase crystals along discontinuous, parallel microcracks is similar to the alteration style of plagioclase in the fine-grained aphyric basalt. This suggests that at least some of the feldspars are derived from this lithology.