The Virtual Petrified Wood Museum.  Dedicated to the Exhibition and Educational Study of Permineralized Plant Material
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Specimen Ridge Virtual Hike
Looking down from the large Sequoia one can see "twin fossil trees". Images of these two trees are iconic for Specimen Ridge. 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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