12: MELTWATER LANDFORM IDENTIFICATION
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1 Glacial Geology 12. Meltwater Landform Identification 12: MELTWATER LANDFORM IDENTIFICATION 60 Points Objective: learn how to identify meltwater landforms and their characteristics in photos and on topographic maps. You should be able to: Describe the appearance (shape and size) of glacial meltwater landforms; Identify characteristics of meltwater landforms that will allow you to correctly identify the landforms; Correctly identify glacial meltwater landforms in photos and on topographic maps; Draw a topographic profile; Calculate the local relief of meltwater landforms shown on topographic maps and, Use meltwater landform characteristics to make inferences about the conditions existing when ice was present. Read: Bennett & Glasser (2009) Chapter 4 pp Questions 1-26: Describe at least two characteristics of the landform in each image that will allow you to correctly identify the landform, and then identify the landform. Red arrows point to the relevant landform or feature in images with multiple possibilities. Photo 12.1 [1.5 points each] Photo 12.2 Photo 12.3 Photo 12.4 Photo 12.5 Photo 12.6 Photo 12.7 K.A. Lemke UWSP 69
2 12. Meltwater Landform Identification Glacial Geology Photo 12.8 Photo 12.9 Photo Photo Photo Photo Photo Photo Photo Photo Photo Photo K.A. Lemke UWSP
3 Glacial Geology 12. Meltwater Landform Identification Photo Photo Photo Photo Photo Photo Photo Photo shows varves. How many years of sediment deposition does the photo show? [1] 28. Map 12.1of Dundee, WI covers part of the northern region of the Kettle Moraine State Forest and contains numerous moulin kames and the Parnell esker. a. Circle at least six moulin kames at their base (lowest elevation). [2] b. Determine the local relief of your circled kames. The local relief is the change in elevation from the top of the kame to the base of the kame. List your elevations and local relief calculations below. [3] c. What is the average local relief of the kames in this area? [1] K.A. Lemke UWSP 71
4 12. Meltwater Landform Identification Glacial Geology d. Based on the size of the kames, what can we infer regarding the ice thickness at the time the kames formed? [2] e. Circle or highlight the Parnell esker. [0.5] f. What is the approximate local relief of this esker? [0.5] g. How does the local relief of the moulin kames compare to the local relief of the esker? What might account for the difference in local relief? [2] 29. Map 12.2 of Polonia, WI covers a portion of Portage County. The terminal moraine from the last glacial advance is marked on the map. Arrows show the direction of ice flow. a. Two outwash fans front the terminal moraine. Highlight the contour lines defining these outwash fans. [2] b. Label the outwash plain. [1] c. Breaks in the end moraine indicate locations where meltwater flowed from behind the moraine out onto the outwash plain. A dashed line marks the path for water flowing through one of the breaks. Draw a topographic profile along this dashed line using the graph paper in Figure Because the dashed line is not straight, you will need to rotate the graph paper as you follow this line. Use all the contour lines, not just the index contours, to draw your profile. Your profile should show Osterlee Lake and the depression on the moraine crest. [5] d. Based on the topography shown on the map and on the shape of your profile, do you think ice was present at the time the fans formed with meltwater flowing through a subglacial tunnel? Or, do you think the ice was gone and the moraine acted as a dam causing a lake to form to the east of the moraine, which lasted until meltwater broke through the moraine? Why? [3] 72 K.A. Lemke UWSP
5 Glacial Geology 12. Meltwater Landform Identification K.A. Lemke UWSP 73
6 12. Meltwater Landform Identification Glacial Geology FIGURE 12.1 Topographic Profile Across the Hancock Moraine, Portage County, WI Vertical Exaggeration 40 X 74 K.A. Lemke UWSP
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