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This is a much more difficult exercise than the previous two because we will find several possibilities for the sequence of geologic events .You do not need to complete the second half of this particular exercise (about resolving these ambiguities in the relative dating).Question 5 (3 points): What is the sequence of events that can be inferred from the above cross-section?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.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).In order to do this, we need to apply the principles of relative dating which we have learned.Complete the sequence correctly and explain the logic and principle behind your choice for each event.
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.Question 4 (3 points): What is the sequence of events that can be inferred from the above cross-section?What principle(s) of relative dating did you use in order to arrive at your interpretation of the relative timing of each event?The absolute ages of the rocks have been determined through radiometric dating where possible.
Hence, the geologic time scale provides a calibrated "yardstick" for determining the ages of rocks worldwide through an examination of their fossils.
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