Build a Tree-Ring Timeline by Rick Groleau Assessing the age of a living tree is straightforward enough—just extract a core from the tree's circular trunk and count the number of lines in the ...

Counting back the rings might line up with a hurricane that wiped out all the trees around it, or a logging expedition from which the tree was spared. There’s a lot of history to be found in trees.

Examining a tree ring core sample. CBS News "If you're trying to look at people in the past through time, tree rings give you a way to ...

On that core, they counted 2,400 tree rings and estimated the additional age using modeling. According to Science magazine, the tree was estimated to be 5,484 years old.

How do you determine the age of a tree? Just count the rings, of course! One ring equals one year of growth. If you’ve ever stumbled upon a tree stump you may have even done it yourself. But if ...

Carroll, a biologist at Humboldt State and a consultant for the League, came up with 777 years by comparing the tree rings from Tree 76 to a database of core samples taken from redwoods across ...

In 2012, the lab moved into a larger building to accommodate its growing mission and number of researchers – now some 70 or so – and to unpack its vast collection of tree rings and core samples.

The tree-ring study, which requires core samples and laboratory analysis of dozens of local redwood trees, ...

And other researchers have used tree-ring data to corroborate and, in some instances, correct ice-core data about volcanic eruptions that affected the global climate.

Except in exceptional, unethical situations, tree-ring scientists (dendrochronologists) don't kill trees to date them. Instead, they screw in an increment borer and extract a core sample, hoping ...

The tree-core samples themselves came from Bighorn Basin, a mountain-encircled plateau region in north-central Wyoming about 500 miles from Boulder. Waddle collected some of the tree cores herself in ...

Currey, who had been granted permission from the U.S. Forest Service to take core samples of bristlecone pines in the area, found 4,862 growth rings at the center of this tree.