Figure F29. Color laminae superimposed on bioturbated white chalk (Subunit IB; Miocene; interval 192-1183A-8R-2, 36-47 cm). Pyritized burrow at 44 cm indicates postburial redistribution of iron. Color laminae are analogous to Liesegang banding produced by diagenetic redox fronts.

Figure F29. Color laminae superimposed on bioturbated white chalk (Subunit IB; Miocene; interval 192-1183A-8R-2, 36-47 cm). Pyritized burrow at 44 cm indicates postburial redistribution of iron. Color laminae are analogous to Liesegang banding produced by diagenetic redox fronts.