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Purpose and scope of investigation  _ Geographic and geologie settingPrevious work Acknowledgments Stratigraphy Petrology Observations Interpretations  Geochemical studies Sampling and analytical methods Elements studied Statistical analysis Stratigraphic comparisons  . Facies comparisons Geochemical association of the metals  _ Textural and compositional comparisons  _ Locality comparisons Gold Summary and conclusions References cited ILLUSTRATIONS Page 1 ~ 2 2 3 4 4 4 9 9 10 12 12 '16 16 18 28 30 36 43 48 50 55 Page FIGURE 1. Map showing location of Colorado Plateau region_ 3 2. East-west cross s·ection across the Colorado Plateau region, illustrating typical facies andmember relationships in the Moenkopi Formation 8 3-5. Probability graphs of the log distributions of: 3. Ca, Fe, Mg, Ti, Ba, and Mn 19 4. Sr, Zr, V, Cr, Cu, and Cu(A) 20 5. Y, Pb, Ni, Co, Ag(A), and Hg(A) 21 6. Probability graph of the highly truncated log distributions of Be and Au (A)  _  22 7-9. Graphs showing: 7. Mean abundance of 20 metals in the Moenkopi Formation 23 8. Comparison of metal content of some members with average metal content of the entire formation 25 9. Comparison of metal content of rocks from different facies with average metal content of the entire formation 29

Geochemical distribution of some metals in the Moenkopi Formation and related strata, Colorado Plateau region