FIGURE 5 e Beaver elient Bishop e (11,.87) fthes) 2 ° (29-5) e Cedar City (36.6) St, George Overton e CALIFORNIA (9.7) Mesquite (5-2) » Barstow (2.0) ARIZONA x Sr? IN POST PLUMBOB SOIL COLLECTED IN CALIFORNIA, NEVADA AND UTAH. (Figures in parenthesis represent average me/'sqe mile) - 51 - —