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The two intrusions are labeled as X and Z; the surrounding rock (called the "country rock") is labeled as D.We have seen that a cliff or a road cut is a local "geologic cross-section" -- a side view of the geology at one location.Applying the principles of relative dating to these rock exposures (also called "outcrops"), we can reconstruct the sequence of events that created the geologic features which we see.Events can be the deposition of a sedimentary layer, the eruption of a lava flow, the intrusion of magma to form a batholith, a fault (break) in the rock that shifts one side relative to the other side (and causes an earthquake), a fold that bends and distorts rock layers, or any number of other geologic processes.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.
After the practice above, try a more thorough analysis of the history of the landscape shown on page 173 of our Chernicoff/Fox textbook.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.You do not need to complete the second half of this particular exercise (about resolving these ambiguities in the relative dating).Question 4 (3 points): What is the sequence of events that can be inferred from the above cross-section?
Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.