[ Figure 21. Section of Gravel Pit ]

[ Figure 22. Contorted Strata ]

[ Figure 23. Section Across Valley of the Ouse ]

[ Figure 24. Position of Flint Weapons ]

[ Figure 25. Hill of Fajoles ]

[ Figure 26. Alluvial Plain of the Mississippi ]

[ Figure 27. Succession of Strata ]

[ Figure 28. Cyclas ]

[ Figure 29. Cliff ]

[ Figures 30 and 31. Strata ]