Figure F4. Generalized plot of chert and porcellanite color (either "oxidized" hues [red] or "reduced" hues [black]) vs. age for Sites 1207, 1213, and 1214, as well as DSDP Sites 305 and 306. The age attributions of Sites 305 and 306 were obtained from Sliter (1989, 1992). See Tables T3 in the "Site 1207" chapter, T4 in the "Site 1213" chapter, and T2 for detailed color variation.

Figure F4. Generalized plot of chert and porcellanite color (either "oxidized" hues [red] or "reduced" hues [black]) vs. age for Sites 1207, 1213, and 1214, as well as DSDP Sites 305 and 306. The age attributions of Sites 305 and 306 were obtained from Sliter (1989, 1992). See Tables T3 in the "Site 1207" chapter, T4 in the "Site 1213" chapter, and T2 for detailed color variation.