Table 1.

Effect of increasing proportions of marine-derived carbon on calibration of directly dated El Arenal-1 chicken bone

ΔR	Marine C, %	Calibration dataset	Radiocarbon on chicken bones from the El Arenal-1 (n =622 ± 35)
0 ± 0	0	SHCal04	AD 1304–1424
61 ± 50*	10	Mixed marine SoHem	AD 1322–1445
61 ± 50	20	Mixed marine SoHem	AD 1395–1459
61 ± 50	30	Mixed marine SoHem	AD 1407–1501
61 ± 50	40	Mixed marine SoHem	AD 1430–1619
61 ± 50	50	Mixed marine SoHem	AD 1455–1630

*ΔR of 61 ± 50 based on single bivalve determination from Valparaiso, Chile (12). This value is considered a conservative estimate of depletion in these waters. All calibrated dates are reported at 2σ. Bold type denotes pre-Columbian values.