Figure 11: (a) Geomorphic setting of Lake Shelby, Alabama, showing location of sediment cores used in stratigraphic study. Black and white line is Alabama State Highway 182. (b) Radiocarbon-dated stratigraphic units of Lake Shelby cores A, B, E, L and S. All ages shown here and in text are uncalibrated 14C ages unless specified otherwise. Date of 3700 + 100 years ago in core E is rejected for being too old, perhaps because of contamination by dead carbon in shell fragments. Inset photograph shows sand layer in core E, at 314 cm, sandwiched between lagoonal clay (Liu and Fearn 1993).