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Cross section through the trunk of a Yellowstone lodgepole pine

Detailed Description

Cross section through the trunk of a lodgepole pine tree from Cooking Hillside near Mud Volcano, Yellowstone National Park.  The earliest date for this tree is 1916 and it died in 1990. Spongy white-gray areas are foam insulation that was injected into the sample to reinforce the structure of the wood.

Sources/Usage

Public Domain.