Preface. List of Contributors. Part I. Introduction. 1. The Permian Earth (J.R. Hein). 2. Evolution of thought concerning the origin of the Phosphoria Formation, Western US Phosphate Field (J.R. Hein, R.B. Perkins, B.R. McIntyre). Part II. Regional Studies. 3. The history of production of the Western Phosphate Field (S.M. Jasinski, W.H. Lee, J.D. Causey). 4. The Meade Peak Member of the Phosphoria Formation: Temporal and spatial variations in sediment geochemistry (R.B. Perkins, D.Z. Piper). 5. Regional analysis of spiculite faunas in the Permian Phosphoria basin: Implication for paleoceanography (B.L. Murchey). 6. Strain distribution and structural evolution of the Meade plate, southeastern Idaho (J.G. Evans). Part III. Geological and Geochemical Studies in southeast Idaho. 7. The effects of weathering on the mineralogy of the Phosphoria Formation, southeastern Idaho (A.C. Knudsen, M.E. Gunter). 8. Petrogenesis and mineralogic residence of selected elements in theMeade Peak Phosphatic Shale Member of the Permian PhosphoriaFormation, southeast Idaho (R.I. Grauch, G.A. Desborough et al.). 9. Weathering of the Meade Peak Phosphatic Shale Member, Phosphoria Formation: Observations based on uranium and its decay products (R.A. Zielinski, J.R. Budahn et al.). 10. Mineral affinities and distribution of selenium and other trace elements in black shale and phosphorite of the Phosphoria Formation (R.B. Perkins, A.L. Foster). Part IV. Geoenvironmental Studies. 11. The Phosphoria Formation: A model for forecasting global seleniumsources to the environment (T.S. Presser, D.Z. Piper et al.). 12. Lithogeochemistry of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation, southeast Idaho (J.R. Herring, R.I. Grauch). 13. Rock leachate geochemistry of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation, southeast Idaho (J.R. Herring). 14. Rex Chert Member of the Permian Phosphoria Formation: Composition, withemphasis on elements of environmental concern (J.R. Hein, B.R. McIntyre et al.). 15. Gaseous selenium and other elements in near-surface atmospheric samples, southeast Idaho (P.J. Lamothe, J.R. Herring). 16. Selenium loading through the Blackfoot River watershed: Linking sourcesto ecosystems (T.S. Presser, M. Hardy et al.) 17. Selenium attenuation in a wetland formed from mine drainage in the Phosphoria Formation, southeast Idaho (L.L. Stillings, M.C. Amacher). 18. Selenium and other trace elements in water, sediment, aquatic plants, aquatic invertebrates, and fish from streams in SE Idaho near phosphate mining (S.J. Hamilton, K.J. Buhl, P.J. Lamothe). 19. Uptake of selenium and other contaminant elements into plants and implications for grazing animals in southeast Idaho (C.L. Mackowiak, M.C. Amacher et al.). Part V. Modeling Studies. 20. Review of world sedimentary phosphate deposits and occurrences (G.J. Orris, C.B. Chernoff). 21. Western Phosphate Field - Depositional and economic deposit models (P.R. Moyle, D.Z. Piper). 22. Societal relevance, processing, and material flow of western phosphate -Refreshments, fertilizer, and weed killer (S.M. Jasinski). Appendix CD: Table of world sedimentary phosphate deposits (with appendices forchapters 12, 13, 18, and 19) (G.J. Orris, C.B. Chernoff). Authors Index. Subject Index.