- What type of glacial
landform is Gunsight Lake sitting in?
- Using the 1:24,000
topographic map (which should be open in a separate window), how many ice
fields exist on the surrounding slopes that might have contributed to the
glacier that once occupied this valley?
How
many ice fields are shown on the surrounding slopes that might have contributed
to the glacier that once occupied this valley on the 1:100,000
topographic map?
- Which map shows more
ice fields, and why?
- Most
of these ice fields are fronted by moraines, although many of the moraines
do not show clearly on the topographic map. Look at the surficial
deposits map (leave this window open until you are finished with this
set of questions). What group do these moraines belong to, and approximately
how old are they (check the key)?
- The surficial deposits
map shows another moraine at the base of the cirque headwall, just southwest
of Gunsight Lake. What group does this moraine belong to, and approximately
how old is it?
- The surficial deposits
map also shows a moraine just northeast of Gunsight Lake. What group does
this moraine belong to, and approximately how old is it?
- Based on the ages of
these moraines, summarize the history of glacial retreat they reveal.
- Here are two more views
of the St. Mary River Valley. How do we know simply from looking at the
landscape, that this valley was glaciated?
- Based on all the maps,
information and your explorations along the trip so far, approximately how
far down-valley do you think the glacier that occupied the Gunsight Lake
valley extended at its maximum? Why? You may want to look to the
1:100,000 topographic map (this should be open in a separate window) for
reference features.
At this point, you should
close any open map windows or map key windows.
Created February 26,
1999 by Karen A. Lemke (klemke@uwsp.edu).
Last updated March 4, 1999 by KAL.
The URL for this page is http:/www.uwsp.edu/geo/faculty/lemke/gnp_vft/stops/stop1_activity2.html
