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Geology, Vol. 1 [of 3] : $b Geologic processes and their resultsSalisbury, Rollin D.

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Geology, Vol. 1 [of 3] : $b Geologic processes and their results

Name: Geology, Vol. 1 [of 3] : $b Geologic processes and their results
Author: Salisbury, Rollin D.

Salisbury, Rollin D.

Geology

The illustrations have been selected from numerous sources, which are
usually acknowledged in the text. Especial acknowledgment is due to the
U. S. Geological Survey for the use of numerous photographs and maps,
and to Mr. G. A. Johnson, who has made many of the drawings reproduced
in Volume I. The authors are under even larger obligations for
assistance in the preparation of Volume II, for which acknowledgment
will be made in the proper place.

University of Chicago, January, 1904.




                               CONTENTS.

                               VOLUME I.


                              CHAPTER I.

                         PRELIMINARY OUTLINE.

      Subdivisions, 1. Dominant processes, 2.

                                                                    PAGE

+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


                              CHAPTER II.

                 THE ATMOSPHERE AS A GEOLOGICAL AGENT.

+The Atmosphere as a Direct Agency+                                   21
    I. _Mechanical Work_                                              21
      Transportation and deposition of dust, 22. Transportation
      and deposition of sand, 25. Formation of dunes, 26. Shapes
      of dunes, 26. The topographic map, 30. Topography of dune
      areas, 32. Migration of dunes, 33. Distribution of dunes, 35.
      Wind ripples, 37. Abrasion by the wind, 38. Effects of wind
      on plants, 40. Indirect effects of the wind, 41.
   II. _Chemical Work_                                                41
      Precipitation from solution, 41. Oxidation, 42. Carbonation,
      43. Other chemical changes, 43. Conditions favorable for
      chemical changes, 43.

+The Atmosphere as a Conditioning Agency+                             43
    I. _Temperature Effects_                                          44
   II. _Evaporation and Precipitation_                                50
  III. _Effects of Electricity._                                      52

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Geology, Vol. 1 [of 3] : $b Geologic processes and their results

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