1 week ago
This is the cross-sectional ring of the trunk of a giant Sequoia tree, conserved at the famed Sequoia National Park, California. With a diameter of 15 feet (approx.), it gives an impression of the gigantic size of the tree. The ring has been studied by geologists to date the age and the wildfires withstood by these ancient trees which have been part of the ecology and standing tall for thousands of years.
Quoting from the information put up in the park :
"This slab from the stump of a giant Sequoia tells a story of fire and survival. The annual growth rings show that the tree lived about 2210 years. Marks within some rings show that, during that time, at least 80 different fires burned hot enough to leave a scar.
Mature sequoias survive all but the very hottest fires. Thick, fibrous bark insulates the tree from killing heat. The bark holds very little sap or pitch, so it is not very flammable. As you can see in the slab, even if fire does penetrate the bark on occasion, it doesn't often kill the tree. Mature sequoias live quite well despite large fire scars."
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