Ancient Forests
of North America
This map shows locations of ancient forests in North America (except the Arctic) that dendrochronologists have identified by examining tree rings. Forests range from 20 acres to well over 20 square miles. All contain trees at least 250 years old; many contain specimens over 1,000 years old. David W. Stahle, author of "The Unsung Ancients" (Feb. 2002), notes "Developing a profile of forest growth with tree-ring chronology is intricate and time-consuming. Thousands more ancient forests are known that don't appear on this map, particularly in western and south-central U.S."

The Earth Restoration and Reforestation Alliance updated 4/14/2003