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The relative dating principle of
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.
Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.
Cliffs and road cuts are "side views" or "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot.
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 3 (3 points): Finally, return to the list of hypothetical geologic examples and click on "two intrusions." Again, complete the sequence correctly and explain the logic and principle behind your choice for each event.
This is a much more difficult exercise than the previous two because we will find several possibilities for the sequence of geologic events .
Question 2 (3 points): Return to the list of hypothetical geologic examples and click on "folds and an intrusion." We are again asked to determine the correct sequence of geologic events shown by the cross-section.
Again, complete the sequence correctly and explain the logic and principle behind your choice for each event.
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).