United States FPP - “Bobby Socks” Trees

3 images 1 contributors

Lewis Kemper

About This Spot

There are many places in the park where you can see “Bobby Socks” trees. These trees are dead Lodgepole pines found near some hydrothermal areas. The trees died because of shifting hot spring run-off. The trees look as if look as if they are wearing bobby socks because the dead trees soak up the mineral-laden water. Dissolved minerals in the water leave a crust of white silica on the bottom of the tree. When the water evaporates, the minerals are left behind, turning the lower portion of the trees white. This silica impregnates the wood and over time can petrify the wood. Some of these trees have been standing like this for decades.


In the 1950’s they were called “Bobby Socks” trees after the popular socks teenage girls wore at the time. The name has stuck.

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