ILLUSTRATIONS 



FIG - PAGE 



Map Showing the Soil Provinces and Soil Regions of the United 

 States Frontispiece 



1. Limestone Composed Chiefly of Shells of Brachiopods 9 



2. Limestone Containing Large Amounts of Crinoid Stems 9 



3. Irregular Weathering of Rock Due to Joints and Stratification 11 



4. A More Advanced Stage of Weathering 12 



5. "Capitol Rock," Butte, Montana 12 



6. Exfoliated Granite in the Sierra Nevadas, California 13 



7. Columbia Glacier Overriding a Forest, Alaska 14 



8. Front of Columbia Glacier in 1910 Compared in Height to Bunker 



Hill Monument 15 



9. The Material Carried and Rolled by Streams Gives Them Their Great 



Eroding Power 16 



10. Inner Gorge of Grand Canon of the Colorado River, Arizona 17 



11. Wind-carved Granite 18 



12. The Roots of Trees Form Wedges for Prying Rocks Apart 19 



13. Stalactites and Stalagmites Formed in a Cavern from Limestone 



Dissolved by Carbonated Water While Passing Through the 



Rocks Above 23 



14. Sinkholes in a Cave Region Southern Illinois 24 



15. The Outlets of Sinkholes Sometimes Become Clogged and "Sinkhole" 



Ponds Result 24 



16. Ox-bow Lakes Formed by Shifting of Channel 28 



17. Typical Eastern Swamp Land 29 



18. Florida Everglades 29 



19. Section Showing One Step in the Filling of the Lake with Peat 29 



20. Hummocks 6 to 12 Inches High Found in Swampy Places Produced 



by Trampling of Stock 30 



21. Weathering of Jointed Hock Above and Thin Bedded Beneath 31 



22. Rock Disintegration and Formation of Talus Sloj>o 32 



23. The Side of a Ravine Near Crawfordsville, Indiana 32 



24. Mud Flow 34 



25. Map Showing the Early Stages in the Formation of Coast Marshes. 36 



26. Section of Marine Marsh 36 



27. Mangrove Marsh, Biscayne, Florida 37 



28. Ix-vel Floor of Lake Chicago, with the Shore-line in the Distance ... 37 



29. Terraces of Frazier River at Lilloet, B. C 38 



30. Terrace Along Creek, Near Rockford, Illinois, Showing Stratification 38 



31. Closer View Section of Gravel Terrace of Fig. 30 39 



32. Front of Chenega Glacier Compared with Washington Monument, 



550 Feet High 41 



33. Very Stony and Gravelly Phase of Glacial Drift Near Whitewater, 



Wisconsin 41 



34. Limestone Boulder Showing Glacial Scratches, I'rbana, 111 42 



35. Glacial Grooves or Stria- on Rock Surface. Northern Ohio 43 



36. Typical Topography of Terminal Moraine NmrOromowoc, Wisconsin 43 



37. Drumlins Remnants of Former Terminal Moraines 44 



38. Drumlins Transverse View 44 



39. Adeline Esker, Ogle County, Illinois 44 



40. The Material Composing Adeline Fsker Consists of Coarse Sand and 



Gravel. 45 



