The Page-Ladson site in Florida — a submerged site in a spring-fed river — has produced a mastodon tusk with cut marks consistent with butchery, dated to approximately 14,500 calibrated years before the present.

The Page-Ladson evidence, like Manis, is direct evidence of human-mastodon interaction — in this case on the opposite coast of the continent, at a time when Florida’s coastline extended further into the Gulf of Mexico than it does today and the environment was very different from the tropical landscape of the modern state.

These sites — Manis, Cooper’s Ferry, Paisley Caves, Page-Ladson, and others — collectively demonstrate that pre-Clovis human presence in North America was not a regional anomaly but a continental phenomenon.

People were across the Americas before the Clovis horizon, from the Pacific Northwest to Oregon to the Great Plains to Florida to the southern tip of South America.