Lake Huron

There is a submerged forest of petrified trees in 12 meters (40 feet) of water in Lake Huron, about three kilometers from Lexington's present shore.

An excerpt from the article 20 facts about Lake Huron
According to carbon-dating analysis, some of the underwater exemplars can be approximately eight thousand years old. Studying those sunken trees may reveal many secrets of North American prehistory.