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In the next lab, we will learn how to use local geologic information from outcrops to begin to build such regional geologic maps and geologic cross-sections, but for now we just want to practice how to read them.Remember when we drew a topographic profile for lab manual exercise #1 (page 18) on Topographic Maps?Include all the events which can be inferred from the drawing.List which relative dating principles apply to the order of each event.
Question 4: Using the relative dating method you have now practiced, derive the history of the hypothetical landscape on page 173 (also shown below).
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).
When did all this faulting take place (that is, between the times of which two sedimentary layers did the faulting occur)? Notice the "Great Angular Unconformity" shown on the North Half of the profile.
This is not labeled as such -- but see how the rocks at the bottom of the profile have been tilted while the younger rocks on top are horizontal.