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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).

To review our principles of relative dating as applied to such geologic cross-sections, we will make use of a neat learning tool available on the Internet.

"Athro Limited" is a private company which provides education modules on the Internet.

Just as Sherlock Holmes used his power of observation to decipher the clues to a suspect's past actions, we will let the blemishes and behaviors of the rocks tell us their past story. ) Remember that relative dating involves determining "which came first" rather than "exactly when did this happen." The first step to untangling the geologic history of an area is often to figure out what happened first, second and third, etc.

without knowing the absolute ages at which the rocks themselves formed.

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.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.Complete the sequence correctly and explain the logic and principle behind your choice for each event.Your explanations are as important as the correct sequence in earning the points for this question.

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