As evidence piles up, will we reach a tipping point where people begin accepting the age of humans existence?
He described as "phenomenal" the preservation of the finds, whose location as many as 5 feet deep in oxygen-free sediment had protected them from decay.
They include a Suwannee projectile point -- a spear point -- whose estimated age of 10,000 years puts it "right at the cusp of the end of the Ice Age," Arbuthnot said. The person who lost it may have been hunting a mammoth.
A fish hook made of bone dates back centuries B.C. and also could have been used to catch alligators, he said.
A variety of bone pins -- used for piercings, fish hooks, awls and fastening clothing -- was also unearthed.
In the dredging operation, which began last May and ended in September, the underwater archeologists vacuumed up the sediment on the floor of the basin, put their finds into a floating screen platform and then picked through the clutter, Arbuthnot said.