EAES 101 Gletel Ensiresmenal Chang Spring 2018 Pessible Short Answer Question 2:
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EAES 101 Gletel Ensiresmenal Chang Spring 2018 Pessible Short Answer Question 2:2 points total Think about uwesomeness of glaciers as landscape carvers/builders! Figareconic proglaical andscape. Cordillera Vilkanot, Per Figure 2: Iconic landscape of a fomally glaciated area A) On the figures above, sircle and lahel two glacial depositional features and two glacial resional features.(8 peints) EAES 101 Gletel Ensiremenal Chang Spring 201 B) For each of the four features that you identified in A). briefly discuss (2 seneces) the peocesw(es) through which i forms and identiy whether it is a depositional or crosional feature. (8 points) iis e C) Idensify the name that we give to glacially transperted and deposited sediments. Additionally identify the sedimentary rock that results once this type of sediment lithifies. Provide three observations tat you oould make about this sodimentock (4 poins)Explanation / Answer
Cirque/Corrie
Hollow basin cut into a mountain ridge.
It has steep sided slope on three sides, an open end on one side and a flat bottom.
When the ice melts, the cirque may develop into a tarn lake.
Glacial Trough
In cases where till has been indurated or lithified by subsequent burial into solid rock, it is known as the sedimentary rocktillite. Matching beds of ancient tillites on opposite sides of the south Atlantic Ocean provided early evidence for continental drift. The same tillites also provide some support to the Precambrian Snowball Earth glaciation event hypothesis.
The widespread tillites in the geologic record provide evidence of former intense and widespread glaciation; Recent tillites (less than 11,700 years old) can be directly connected with glaciation, and Pleistocene tillites (11,700 to 2,600,000 years old) can be convincingly related to glaciation, but many earlier till-like bodies cannot. Only tillites formed from the till deposited by continental ice sheets have a good chance of being preserved in the geologic record.
Outwash Plain
When the glacier reaches its lowest point and melts, it leaves behind a stratified deposition material, consisting of rock debris, clay, sand, gravel etc. This layered surface is called till plain or an outwash plain.
Esker
Winding ridge of un-assorted depositions of rock, gravel, clay etc. running along a glacier in a till plain.
The eskers resemble the features of an embankment and are often used for making roads.
Till or glacial till is unsorted glacial sediment. Till is derived from the erosion and entrainment of material by the moving ice of a glacier.
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