Figure F21. Photomicrograph in plane-polarized light of Sample 187-1157B-3R-1, 137-140 cm (see "Site 1157 Thin Sections"), showing lithic fragments in a micritic calcite vein, including a partially disaggregated fragment of basalt probably from the wall rock (upper left) and a pseudomorph of skeletal olivine consisting of pale brown clay (lower right).