Relative dating sequence

Include all the events which can be inferred from the drawing.

List which relative dating principles apply to the order of each event.

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.

Notice that the rock layers are each labeled with several letters.

Each rock layer was deposited at a different geologic time.

We will learn more about this method of identifying rock units and geologic time periods in next week's lab.

Question 5: On the South Half, approximately how high is Hopi Point on the Coconino Plateau? Use the letter labels to refer to the distinct rock layers.

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.

The various sedimentary layers are labeled as B, E, K and W.

The timing of the fault (break) in the rocks (labeled as Q) must be included in the sequence of events.

Click Question 1: What is the sequence of events that can be inferred from the above cross-section?

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