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.