Relative dating practice

by  |  12-Oct-2015 11:51

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.

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.

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All 13 lettered events need to be included in your sequence.

Question 4: Using the relative dating method you have now practiced, derive the history of the hypothetical landscape on page 173 (also shown below).

Applying the principles of relative dating to these rock exposures (also called "outcrops"), we can reconstruct the sequence of events that created the geologic features which we see.

Events can be the deposition of a sedimentary layer, the eruption of a lava flow, the intrusion of magma to form a batholith, a fault (break) in the rock that shifts one side relative to the other side (and causes an earthquake), a fold that bends and distorts rock layers, or any number of other geologic processes.

Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.

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