Samples of sedimentary organic matter were selected for radiocarbon dating. Code site and laboratory number, sample identification with depth (cm), 14C ages (yr BP, 1σ), calibrated ages (cal. yr BP, 2σ deviation), and median of calibrated ages (cal. yr BP). Radiocarbon dates were acquired by accelerator mass spectrometry (AMS) at the Center for Applied Isotope Studies (UGAMS) of the University of Georgia and International Chemical Analysis, Inc. Radiocarbon ages were normalized to a δ13C of −25‰ VPDB and reported as calibrated years (calibrated years before the present; 2σ) using CALIB 8.2.