Figure F28. Multiple and overlapping diagenetic features (upper Subunit IIIB; Albian; interval 192-1183A-50R-CC, 1-18 cm). The piece of pinkish limestone at 4-7 cm was partially silicified by a red chertification front descending from the top. Superimposed on both the limestone and the chert is a dark gray mottle (right) caused by late-stage redox migration of oxides.

Figure F28. Multiple and overlapping diagenetic features (upper Subunit IIIB; Albian; interval 192-1183A-50R-CC, 1-18 cm). The piece of pinkish limestone at 4-7 cm was partially silicified by a red chertification front descending from the top. Superimposed on both the limestone and the chert is a dark gray mottle (right) caused by late-stage redox migration of oxides.