Ancient bison bones discovered at Ayer Pond on Orcas Island, Washington, were radiocarbon-dated to about 13,800 years ago.
Notes on verification
Multiple independent sources, including peer-reviewed literature (Kenady et al., Quaternary International) and archaeological commentary, corroborate radiocarbon dating of bison bones from Ayer Pond, consistent with a calibrated age of ~13,800-13,900 calendar years ago.
Sources
- The First Americans - Smithsonian Magazine (smithsonianmag.com)
- https://qmackie.com/2010/04/24/orcas-bison/ (qmackie.com)
- https://www.sciencedirect.com/science/article/abs/pii/S1040618210001369 (sciencedirect.com)
- https://islandhistories.com/items/show/22 (islandhistories.com)