Figure F24. Photomicrograph showing a sandstone from Subunit VIA (Sample 194-1193A-70X-CC, 4 cm; 431.2 mbsf). Poorly sorted quartz grains (Q) are accompanied by subordinate bioclasts (mainly echinoderm (E) and bryozoan fragments) and dark grains of phosphate (X) and oxidized glauconite. The grains have an isopachous coating of very fine crystalline, equant calcite (1), which coarsens outward from the grain surface. Echinoderm fragments are enclosed in syntaxial calcite cement overgrowths (S).

Figure F24. Photomicrograph showing a sandstone from Subunit VIA (Sample 194-1193A-70X-CC, 4 cm; 431.2 mbsf). Poorly sorted quartz grains (Q) are accompanied by subordinate bioclasts (mainly echinoderm (E) and bryozoan fragments) and dark grains of phosphate (X) and oxidized glauconite. The grains have an isopachous coating of very fine crystalline, equant calcite (1), which coarsens outward from the grain surface. Echinoderm fragments are enclosed in syntaxial calcite cement overgrowths (S).