Figure F11. Partial chert formation in a bioturbated, white, foraminifer nannofossil limestone (interval 192-1186A-5R-1, 62-76 cm; Unit II, Eocene). Chert appears to initially replace the matrix between discrete burrows filled with limestone. Some bands have undergone nearly complete replacement by chert, whereas silicification of other bands of bioturbated white limestone is minor.

Figure F11. Partial chert formation in a bioturbated, white, foraminifer nannofossil limestone (interval 192-1186A-5R-1, 62-76 cm; Unit II, Eocene). Chert appears to initially replace the matrix between discrete burrows filled with limestone. Some bands have undergone nearly complete replacement by chert, whereas silicification of other bands of bioturbated white limestone is minor.