ConcepTest: Cross Section Explanation
This material was originally created for
Starting Point:Introductory Geology
and is replicated here as part of the SERC Pedagogic Service.
and is replicated here as part of the SERC Pedagogic Service.
Question:
During fieldwork in the western U.S., an experienced geologist sketched the cross section below showing three different units of tilted rocks and their relative ages. What could you best infer from this diagram?
a. Mountain building has overturned the units.
b. C formed first and so lies on the bottom.
c. B and C must be igneous rocks.
d. The sequence of rock layers conforms to the principle of superposition.
a. Mountain building has overturned the units.
b. C formed first and so lies on the bottom.
c. B and C must be igneous rocks.
d. The sequence of rock layers conforms to the principle of superposition.
Student Responses:
No data yet. The correct response is a.
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