Photograph of the exposed roots and lower trunk of a tree that has recently eroded out of its entraining glacial sediment, Muir Inlet, Glacier Bay National Park, Alaska. The top of the tree was sheared off by an advance of Muir Glacier ~ 8,000 years ago.
The study of tree rings and subfossil wood to provide information about the glacial and climatic history of an area.
Photograph of several exposed tree trunks, recently eroded out of glacial-lacustrine sediment, south of the eastern margin of Bering Glacier, Alaska. The slab of wood that was cut from the tree in the foreground will have its rings analyzed and will have samples of individual rings radiocarbon dated. The tree was sheared off by an advance of Being Glacier ~ 1,500 years ago. Photograph by Austin Post. Bering Glacier flows through Wrangell-Saint Elias National Park