Plate P4. Photomicrographs illustrating mineral and lithic grains from sands/sandstones at Site 1178, Leg 190, Nankai Trough trench wedge (Sample 190-1178B-23R-2, 51-53 cm [613.7 mbsf]). 1. Mudstone fragment with thin quartz vein (plane-polarized light). 2. Mudstone fragment (plane-polarized light). 3. Mudstone fragment (cross-polarized light). 4. Radiolarian chert fragment with quartz veins (plane-polarized light). 5. Mudstone fragment (plane-polarized light). 6. Chert fragment with quartz veins (cross-polarized light).

Plate P4. Photomicrographs illustrating mineral and lithic grains from sands/sandstones at Site 1178, Leg 190, Nankai Trough trench wedge (Sample 190-1178B-23R-2, 51-53 cm [613.7 mbsf]). 1. Mudstone fragment with thin quartz vein (plane-polarized light). 2. Mudstone fragment (plane-polarized light). 3. Mudstone fragment (cross-polarized light). 4. Radiolarian chert fragment with quartz veins (plane-polarized light). 5. Mudstone fragment (plane-polarized light). 6. Chert fragment with quartz veins (cross-polarized light).