XXIX. An island in the Lower Dalles XXX. View in Lower Dalles XXXI. Stand Rock XXXII. Petenwell Peak XXXIII. North American ice sheet XXXIV. Owl's Head XXXV. Cut in glacial drift XXXVI. Glaciated stones XXXVII. Topographic map of a small area about Devil's Lake XXXVIII. Distorted laminæ of silt and clay FIGURES IN TEXT. Figure 1. Profile across the Baraboo quartzite ranges through Baraboo 2. Profile across the Baraboo ranges through Merrimac Transcriber's note: There is no figure 3. 4. Diagram showing the structure of the quartzite 5. Diagram showing the relation of the Potsdam sandstone to the Baraboo quartzite 6. Diagram illustrating effect of faulting on outcrop 7. Diagram showing the disposition of sediments about an island 8. The same as 7 after subsidence 9. Diagram showing relation of Potsdam conglomerate to quartzite at Devil's Lake 10. Cross section of a delta 11. The geological formations of southern Wisconsin 12. A typical river system 13. Diagram illustrating the relations of ground water to streams 14. Diagram illustrating the shifting of divides 15. Diagram showing topography at the various stages of an erosion cycle 16. Diagram illustrating the development of rapids and falls 17. Sketch looking northwest from Camp Douglas 18. Diagrammatic cross section of a young valley 19. Diagrammatic profile of a young valley 20. Diagrammatic cross section of a valley in a later stage of development 21. The same at a still later stage 22. Diagram illustrating the topographic effect or rejuvenation of a stream by uplift 23. Normal profile of a valley bottom 24. Profile of a stream rejuvenated by uplift 25. Diagram illustrating monoclinal shifting 26. Diagram showing the relation of the Potsdam sandstone to the quartzite at the Upper Narrows 27. Diagrammatic cross section of a field of ice and snow 28. Shape of an erosion hill before glaciation 29. The same after glaciation 30. Diagram showing the effect of a valley on the movement of ice 31. The same under different conditions 32. Diagram showing the relation of drift to the underlying rock where the drift is thick 33. The same where the drift is relatively thin 34. Diagrammatic representation of the effect of a hill on the edge of the ice 35. The same at a later stage of the ice advance 36. Map showing the relation of the ice lobes during the Wisconsin epoch of the glacial period 37. Sketch of the terminal moraine topography east of Devil's Lake 38. Cut through the terminal moraine east of Kirkland 39. Cross section of the marginal ridge of the moraine on the south slope of the Devil's nose 40. Cross section of the marginal ridge of the moraine on the crest of the quartzite range