Lab 9, part 2
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Dec 6, 2023
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Lab 9, part 2
The following questions are based on Map T-13, the “Mono Craters, California” quadrangle (scale 1:62,500;
contour interval 80 feet). The heavily glaciated eastern crest of the Sierra Nevada is seen along the western
sides of the map. During the Pleistocene, glaciers in this region flowed down the valleys on the eastern slope of
the Sierra toward the Mono Lake basin to the northeast. Large lateral moraines are found at the mouths of each
canyon.
1.
(a) A small glacier is located just north of the Dana Plateau (in the northwest section of the map). In
what kind of glacial landform is this glacier found?
(b) What evidence suggests this feature was eroded by a glacier that was larger than the present one?
2.
(a) What is the name for the kind of glacial landform illustrated by Mt. Gibbs? (On the topographic
map, the dashed black line showing the boundary between Mono and Tuolumne Counties runs through
the summit of Mt. Gibbs.)
(b) How does this kind of glacial landform develop?
Large lateral moraines can be seen at the mouth of Bloody Canyon (Walker Lake and Walker Creek are between
these moraines; 37°52'28"N, 119°09'53"W). The glacier that left these moraines flowed down Bloody Canyon
from near Mono Pass. Sawmill Canyon (just south of Bloody Canyon) consists of two large lateral moraines—
these moraines were left by a glacier that at one time also flowed down Bloody Canyon.
3.
How deep (thick) was the ice in the glacier that formed the lateral moraines at the bottom of Bloody
Canyon? You may assume that the ice reached the top of the lateral moraines. Estimate the height of the
lateral moraine just south of the word “Lake” in “Walker Lake.”
feet
4.
Based on the evidence you see in the map and in the stereogram, explain the formation of Walker Lake.
5.
(a) Which set of moraines formed first: the Bloody Canyon
moraines or the Sawmill Canyon moraines?
(b) How do you know?
6.
There are five small glaciers shown on this map (glaciers are shown as white patches with blue contour
lines). Why can glaciers survive today in these locations but not in others?
7.
What evidence suggests that the edges of the Dana Plateau were extensively glaciated in the past?
8.
Find and describe the location of a hanging valley.
9.
(a) What is the name for the kind of glacial landform marked by the black dashed line halfway between
Mt. Dana and Mt. Gibbs?
(b) How did it form?
10.
How many tributary glaciers clearly flowed into Bloody Canyon? (Hint: Look for U- shaped valleys that
enter Bloody Canyon; these valleys are now reoccupied by streams.)
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