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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.

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Let's return to one of the text questions we addressed as part of last week's homework.After the practice above, try a more thorough analysis of the history of the landscape shown on page 173 of our Chernicoff/Fox textbook.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).Remember when we drew a topographic profile for lab manual exercise #1 (page 18) on Topographic Maps?

We could draw such a profile across several miles of landscape so we would see a side-view of the land's surface over which we might be hiking.

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).

This map displays the large-scale (also called "regional") geologic features they have inferred are present beneath the landscape.

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).