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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.
Question 5 (3 points): What is the sequence of events that can be inferred from the above cross-section?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.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.