Figure F26. Microfacies of laminated dark calcareous claystone (Subunit IIIB; Aptian-Albian; Sample 192-1183A-53R-3, 112-114 cm; plane-polarized light; field of view = 2.8 mm; photomicrograph ID# 1183AS_21). Reddish brown matrix consists of fine particles of iron oxyhydroxides with variable proportions of calcareous nannofossils in each band. White laminae are concentrations of planktonic foraminifers and phosphatic fish debris.

Figure F26. Microfacies of laminated dark calcareous claystone (Subunit IIIB; Aptian-Albian; Sample 192-1183A-53R-3, 112-114 cm; plane-polarized light; field of view = 2.8 mm; photomicrograph ID# 1183AS_21). Reddish brown matrix consists of fine particles of iron oxyhydroxides with variable proportions of calcareous nannofossils in each band. White laminae are concentrations of planktonic foraminifers and phosphatic fish debris.