Find the tributary glacier that enters the South Sawyer Glacier from the south (the tributary enters just east of the word “Wilderness”).
The following questions are based on Map T-14, the “Sumdum (D-4), Alaska” quadrangle (scale 1:63,360; contour interval 100 feet). The map shows two glaciers entering the “Tracy Arm.” The Tracy Arm is a fjord just south of Juneau, Alaska (see Exercise 49 for a brief discussion of fjords). The “Sawyer Glacier” enters the Tracy Arm from the north and the “South Sawyer Glacier” enters the Tracy Arm from the southeast (57°52'27"N, 133°10'33"W).
(a) What are the brown stripes along the sides of the glacier (shown with brown stippling)?
(b) What are the brown stripes down the middle of the glacier?
(c) Explain how these stripes came to be in the middle of the glacier.
(a) Beginnings of lateral moraines
(b) Medial moraines
(c) Where lateral moraines from two tributary glaciers join, a medial moraine can form.
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