Laboratory code Deph (cm) Material Conventional14C age (yr BP) Calibrated age (calyr BP) Calibrated age (calyr BP)-2σdeviation Relative areas under probability distribution Beta-277995 1.5-2 bulk sediment 3420 ± 40 3651 3571-3732 0.83 Beta-277996 7.5-8 bulk sediment 4400 ± 40 4959 4857-5061 0.91 Beta-285575 25.5-26 bulk sediment 4660 ± 40 5391 5310-5471 0.95 Beta-267361 40-40.5 bulk sediment 4800 ± 40 5535 5465-5660 0.98 Beta-267362 55-55.5 bulk sediment 5140 ± 40 5903 5857-5950 0.58 Beta-267363 90-90.5 bulk sediment 5790 ± 20 6581 6486-6676 0.99

Table 1: Radiocarbon chronology of core LT1 from Lake Chad.