CHICAGO ROCKS! Geology in the City
Review for Exam #2 (March 31, 2010)
J. Hemzacek and L. Sanders
For the exam, you should be able to do the following:
w Locate a given feature on each of these different maps (for example, we did this for the "worm" or "slug" feature in class):
- street map - topographic map - map of surficial geology - physiographic map
w From each map, extract information about the feature based on the information illustrated in that map.
w Demonstrate that you can work with maps of different scale , accurately correlating them with each other.
w Correlate the information you gather from each map, putting it together to create a single interpretation of the geologic feature.
w Using the "Index to Topographic Maps", determine the precise location of a topographic map on the geologic map. (For example, in class, we worked with the Berwyn and Blue Island topo quadrangles.)
w Using the key to the geologic map, identify the geologic formations that occur in a specific area. (For example, in class, we counted 7-8 geologic formations, plus two special symbols, that occur within the area covered by the Blue Island topo quadrangle.)
w Using a topographic quadrangle and geologic map together, determine where on the topo map a specific geologic deposit can be found. (The example we did in class involved locating where the Parkland Sand deposit could be found in the Blue Island topo quadrangle.)
w Sketch topographic profiles of a feature on a topographic map: (for example, we did this for the Blue Island quadrangle, in both the east-west, and north-south directions).
w Determine what topographic quadrangles you would need to locate a particular feature found on a street map, map of surficial geology, or physiographic map.
w Use city boundaries to correlate the ISGS physiographic map, city map, and topographic quadrangles.
w Use appropriate terminology to describe sediment characteristics associated with various modes of sediment transport and deposition.
w List several different types of sediment and explain the processes that might transport and deposit each of them.
w Define the term weathering, distinguish between the two main types of weathering, and give several examples of weathering processes.
w List the appropriate terms used to describe sediment sizes, in order from large to small (or small to large!) grain size.
w List and describe four mechanisms for transport of sediments.
w Describe the conditions under which deposition (as opposed to erosion and/or transportation) of sediments would occur.
w Explain the difference between "sorted" and "unsorted" (or "poorly sorted") sediments.
w Describe transport and deposition processes that might lead to the following deposits of sediment, and explain your reasoning:
- well-sorted sand
- sorted sand and gravel
- unsorted (or poorly sorted) sediment
w Define the geologic term till.
w Explain the significance of the "puzzle" exercise that we did in class (using the topographic index map worksheet), including doing the following:
|- use appropriate terminology to describe the
shape of the landform found when all the "puzzle" pieces were put
-correlate the landform found with features found on the geologic map and the physiographic map
-interpret the significance of the landform and the material of which it is made
-relate the shape to the direction of glacial advance.
w Describe glacial processes, including doing the following:
| - describe the conditions under which
glaciers will advance, retreat/ recede, and remain "stagnant" (with
respect to the glacier front)
- use appropriate terminology to describe the various mechanisms by which glaciers erode the land; explain what each term means in terms of how erosion occurs; be able to distinguish the conditions under which mechanism will operate (i.e., advancing, retreating, "stagnant")
- describe the mechanism(s) by which glaciers transport material, and under what conditions (when) glaciers transport material in different ways
- describe the mechanism(s) by which glaciers deposit Earth material, and under what conditions deposition occurs.
Describe the meaning of the term "glacial erratic";
explain the significance of glacial erratics in northeastern Illinois
w Define the following terms and explain their importance in Chicago-area geology:
moraine intermorainal area sluiceway Outlet Valley lake plain Glacial Lake Chicago
w Identify each of the features listed above on appropriate types of maps--i.e., geologic, physiographic, and topographic maps.
w Describe the use of geologic resources and identify several items of geologic interest on the NEIU campus.
w Name the three main types of rocks, and describe the characteristics you would use to identify them, when they are used as resources.w Describe several geologic resources found in northeastern Illinois, and for each, give examples of how it would be used.