More information: Blue rings in trees and shrubs as indicators of early and late summer cooling events at the northern ...

In the frigid landscapes of northern Norway, an unusual phenomenon etched into the rings of trees and shrubs has ... help differentiate between early- and late-season cold events.

Well, tree-ring dating, or dendrochronology, can be this precise, and even more so. Dendrochronologists showed that an ancient wooden road uncovered in southwestern England not only was built in ...