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To review our principles of relative dating as applied to such geologic cross-sections, we will make use of a neat learning tool available on the Internet.
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For example, we could use a ruler to draw a straight line (a "transect") from the northwest corner to the southeast corner of the topographic map in our lab kit; then we could draw in the topographic profile along this transect by using the contour line information on the map (as done on page 18).
In the same way, such a transect could also show the inferred profile of the geology underfoot -- the expected rock layers and structures beneath the land from the northwest corner to the southeast corner of the map. You can open a larger version of this diagram by clicking on it.
Question 7 (8 points): Using the relative dating method you have now practiced, derive the history of the hypothetical landscape on page 173 (also shown below).
Include all the events which can be inferred from the drawing.
As geologists piece together the information at various outcrops, they can begin to assemble a "geologic map" (like a road map) of an entire region (consisting of many square miles).
This map displays the large-scale (also called "regional") geologic features they have inferred are present beneath the landscape.
Question 5 (3 points): What is the sequence of events that can be inferred from the above cross-section?Notice that the various sedimentary layers have been labeled with letters.Also an igneous intrusion is present (labeled T) and a fault is present (labeled A).Click Question 1 (3 points): Find the list of hypothetical geologic examples and click on "fault." We are asked to determine the correct sequence of geologic events shown by the cross-section.In order to do this, we need to apply the principles of relative dating which we have learned.
Question 6 (8 points): What is the sequence of events that can be inferred from the above cross-section?