The Virtual Petrified Wood Museum. Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Specimen Ridge: Twin Fossil Pine Trees
Two permineralized fossil trees on Specimen Ridge. The Lamar Valley can be seen below. These trees are 2 feet in diameter, 25 feet tall, and 20 feet apart. These trees are identified as pines (Knowlton, 1899, p. 13).

Knowlton, F.H. (1899) The Fossil Forest of the Yellowstone National Park. USGS Monograph 32, pp. 651-791.

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