Picture (280x30, 2.2Kb)

Picture (574x66, 2.8Kb)

Here is a view of Lake McDonald, which is approximately 9 miles long and approximately 1 mile wide. The lake is approximately 472 feet deep (Raup, et al., 1983). Lake McDonald was carved out by a large valley glacier. Howe Ridge, evident in the background, is capped by lateral moraines (Raup, et al., 1983). Picture (400x263, 23.8Kb)
Picture (64x37, 1.2Kb) The 1;100,000 topographic map and the surficial deposits map show the setting for Lake McDonald. Leave these two windows open until you are finished answering the questions below.

Picture (163x51, 972 bytes)

  1. Using the topographic map, what is the highest elevation along the top of Howe Ridge? Convert this elevation from meters to feet (1 m = 3.281 ft).

  2. Approximately how thick was the ice covering Lake McDonald? How did you decide this?

  3. According to the surficial deposits map, what type of deposits do we find surrounding Lake McDonald? Where else along our trip have we seen this particular type of deposit?

  4. In the region around Howe Ridge and along Snyder Ridge, some spots are marked with a G or an M and some numbers. What do these letters and numbers represent?

  5. Given your answer to question 4, and given the numbers listed on the map, were glaciers most likely covering the land surrounding Lake McDonald approximately 10,000 years before present? Why or why not?

  6. Based on all the activities we've done on our trip so far, approximately how extensive do you think the glaciers were 10,000 years before present? Explain.

 

When you finish answering these questions, you should close any extra windows you have open.

Home | Introduction | Trip Itinerary | Flight 1

Created February 26, 1999 by Karen A. Lemke (klemke@uwsp.edu). Last updated March 10, 1999 by KAL.
The URL for this page is http:/www.uwsp.edu/geo/faculty/lemke/gnp_vft/stops/stop4.html