Figure F47. Photomicrographs of recrystallized and possibly hydrothermally altered interpillow sediment in thin section. A. Sample 185-801C-14R-2, 117-120 cm (plane-polarized light), showing a radiolarian replaced by calcite in a matrix of calcite and smectite. B. Sample 185-801C-5R-1, 7-8 cm (cross-polarized light), illustrating concentric zones within a calcite grain in a matrix of chalcedony. C. Sample 185-801C-15R-1, 7-8 cm (plane-polarized light), showing discrete celadonite crystals (green) and smectite (brown) in a matrix of calcite and chalcedony. D. Image (plane-polarized light) from Sample 185-801C-15R-1, 57-60 cm, displaying a radiolarian pseudomorph with a delicate honeycomb structure in an interpillow chert consisting of microcrystalline silica, chalcedony, and Fe oxyhydroxide. E. A recrystallized interpillow sediment (plane-polarized light) from Sample 185-801C-16R-3, 47-50 cm, comprised of close-packed spherical calcite in a matrix of Fe oxyhydroxides. These calcite crystals contain small seed opaque crystals. Green pore-filling material is probably celadonite. F. Image (cross-polarized light) from Sample 185-801C-22R-1 (Piece 4A, 44-47 cm) showing radial fibers of chalcedony rimmed with finely crystalline quartz. Mass of fine-grained calcite located in northeast quadrant. G. Sample 185-801C-22R-2 (Piece 1B, 18-21 cm) (plane-polarized light) showing botryoidal Fe oxyhydroxide (orange to brownish green) displaying "growth rings" in a matrix of calcite and minor chalcedony. H. Sample 185-801C-24R-1, 112-114 cm (cross-polarized light), illustrating a calcisphere in a matrix of calcite near a pillow margin.