Lab #10: Historical Geology Quiz
Question #1:
If a location has flat lying sedimentary rocks, like in the Grand Canyon, what is the
relationship between the contacts of the rocks and the contour lines of the topographic map?
They are parallel.
Question #2:
You are studying the historical geology of an area and find a normal fault. What
kind of tectonic stress does the presence of a normal fault indicate?
Extensional stress
Question #3:
What kind of relationship would you expect between the contact of an igneous
rock unit/body, such as a granite, and the contour lines of a topographic map?
They are not parallel.
Question #4:
In the Grand Canyon, what kind of unconformity is the Great Unconformity?
Angular Unconformity
Question #5:
The flat lying sedimentary rocks in the Grand Canyon are an example of what
principle?
Original horizontality
Question #6:
The different colored layers found on a geologic map (like the map of the Grand
Canyon you used in lab) represent what?
Different geologic formations.
Question #7:
You see a limestone which is a marine sedimentary rock overlying a sandstone
which formed from beach sand. What kind of event does this record?
A relative rise in sea level.
Question #8:
What is the specific name that describes the contact between a metamorphic rock,
such as a schist, and a sedimentary rock?
Nonconformity
