1. Lecture 17 The way of the wind is a strange, wild way. - Ingram Crockett Glacial deposition, and Wind Webpage for course (daytime) Webpage for course (nighttime)

2. Why such interest in Glaciers? Glaciers as erosion deposition process is very unusual Glaciers were important in fairly recent history Because we live in Maine

3. Glaciers Can erode larger portions of mtns Transport and deposit the material Over 10,000s years Grains can be the size of trucks

4. Glaciers Can erode larger portions of mtns Transport and deposit the material Over 10,000s years Grains can be the size of trucks

5. In lowlands – deposition on large scale till Moraines Fig. 11-18

6. Moraines terminal lateral medial recessional

7. Special features unique to glacial deposition erratics kames eskers kettles drumlins

8. erratics Fig. 11-19

9. Fig. 11-23bl kame

10. Fig. 11-23br kettles

11. Fig. 11-23tl esker

12. Fig. 11-23tr drumlin

13. Mechanisms of Transportation and Deposition Water - streams, rivers, etc., freshwater and marine Wind Gravity – downslope movement Ice – glaciers Some sedimentary rocks form of atoms dissolved in water and precipitated elsewhere

14. Some meteorology… Low pressureHigh Pressure

15. deserts Frosted grains ventefacts Interesting features Fig. 12.14, p. 281

16. Why is the desert floor covered with rocks? Fig. 12.12, p. 280

17. Why is the desert floor covered with rocks? Deflation

18. Fig. 12.13, p. 281

19. Dust Bowl Fig. 12.15, p. 282