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.