CHAPTER I.

PRELIMINARY OUTLINE.

Subdivisions, 1. Dominant processes, 2.

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+Astronomic Geology+ 2 The earth as a planet, 2. Its satellite, 3. Dependence on the sun, 4. Meteorites, 4.

+Geognosy+ 5 I. _The Atmosphere_ 5

Mass and extent, 6. Geologic activity, 6. A thermal blanket, 7. II. _The Hydrosphere_ 7 Oceanic dimensions, 8. Geologic activity, 8. Chief horizons of activity, 9. III. _The Lithosphere_ 9

Irregularities, 10. Epicontinental seas, 11. Diversities of surface, 12. The surface mantle of the lithosphere, 12. The crust of the lithosphere, 13. The interior, 14. Varieties of rock in crust, 14. Stratified rocks, 14. Conformability, 15. Relative ages, 15. The crystalline rocks, 16. Four great sedimentary eras, 17. The Archean complex, 18.

+General Table of Geologic Divisions+ 19