Figure F3. Photomicrograph, with crossed polars, of Sample 187-1158A-2R-1 (Piece 1, 0-4 cm; see "Site 1158 Thin Sections"), showing plagioclase box overgrowths (examples are indicated by arrows) on a plagioclase phenocryst. These overgrowths are in optical continuity with the phenocryst. Note that the thin section is thicker than the standard 30 µm.