Earth History Research Center

Figure 10. Orientation of upright and horizontal petrified trees on several levels in the Specimen Creek and Specimen Ridge Fossil Forests. Note that the orientations of the cross-sections of the long axes of the standing stumps are usually similar to that of the horizontal logs. Each tree from levels with five or less specimens is represented by a line. Those levels with more than five trees are represented by a rose graph with the number of specimens indicated. This illustration first appeared in: Coffin HG. 1976. Orientation of trees in the Yellowstone Petrified Forests. Journal of Paleontology 50(3)539-543. Reprinted with permission of the Society of Economic Paleontologists and Mineralogists.