Plate P2. Photomicrographs illustrating mineral grains present within the sands and sandstones of Woodlark rift. 4. A discrete zoned plagioclase grain surrounded by detrital grains of feldspar, biotite, amphibole, and felsitic volcanic lithic fragments within a calcite-cemented lithic sandstone (Sample 180-1118A-68R3, 36-39 cm [852.42 mbsf]) (cross-polarized light).