First long record of tree rings in the Northen America prior to the Younger Dryas.

What is it about?

We developed a long and well-replicated chronology of tree rings which provides a year-by-year record of environmental change at the southern margin of the Laurentide Ice Sheet millennia prior to the onset of Younger Dryas. The paper describes site & subfossil sources used in the chronology and outlines details of the cross-dating and radiocarbon wiggling of the tree rings collected from the north-west of Lake Michigan, Wisconsin. The data includes logs of classical Two Creekan buried forest that used widely in the glacial stratigraphy of the U.S. Midwest.

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