Figure F8. Nannofossil foraminifer chalk (Subunit IC; Oligocene; Sample 192-1183A-20R-CC, 2-6 cm; plane-polarized light; field of view = 2.8 mm; photomicrograph ID# 1183AS_2). Anastomosing microstylolites (subhorizontal dark streaks in image) are associated with the formation of flaser-nodular texture.