Alice A. Storey et al. discuss radiocarbon and DNA evidence for pre-Columbian chickens in Chile; radiocarbon dating places them at AD 1304 to 1424.
Alice A. Storey, José Miguel Ramírez, Daniel Quiroz, David V. Burley, David J. Addison, Richard Walter, Atholl J. Anderson, Terry L. Hunt, J. Stephen Athens, Leon Huynen, and Elizabeth A. Matisoo-Smith, "Radiocarbon and DNA evidence for a pre-Columbian introduction of Polynesian chickens to Chile," Proceedings of the National Academy of Sciences of the United States of America 104, no. 25 (June 19, 2007): 10335-10339
Abstract
Two issues long debated among Pacific and American prehistorians are (i) whether there was a pre-Columbian introduction of chicken (Gallus gallus) to the Americas and (ii) whether Polynesian contact with South America might be identified archaeologically, through the recovery of remains of unquestionable Polynesian origin. We present a radiocarbon date and an ancient DNA sequence from a single chicken bone recovered from the archaeological site of El Arenal-1, on the Arauco Peninsula, Chile. These results not only provide firm evidence for the pre-Columbian introduction of chickens to the Americas, but strongly suggest that it was a Polynesian introduction.