Section #: 21.2
Relative-Age Dating of Rocks
Practice Test
1.
The principle of _________ states that an intrusion or fault is younger than the rocks it cuts across.
a.
uniformitarianism
b.
superposition
c.
cross-cutting relationships
d.
original horizontality
Hint
2.
What is an erosional contact between sedimentary and nonsedimentary rocks called?
a.
a nonconformity
b.
a lava flow
c.
a fault
d.
a disconformity
Hint
3.
If a horizontal Devonian shale directly overlies a horizontal Ordovician limestone, what is the surface between the strata called?
a.
an angular unconformity
b.
a disconformity
c.
a nonconformity
d.
an erosional surface
Hint
4.
Which layering shown in the figure demonstrates disconformity?
a.
A
b.
B
c.
C
d.
none of the above
Hint
5.
Which feature shown in the figure is the oldest?
a.
H
b.
L
c.
P
d.
Q
Hint
6.
What geologic principle states that in an undisturbed rock sequence, the oldest rocks are on the bottom and the youngest are on the top?
a.
uniformitarianism
b.
cross-cutting relationships
c.
superposition
d.
original horizontality
Hint
7.
What does a disconformity in a sedimentary rock sequence represent?
a.
a gap in the rock record
b.
a flood event
c.
a volcanic eruption
d.
duplicated strata in the rock record
Hint
8.
What principle of geology states that sedimentary rocks are deposited horizontally or nearly horizontally?
a.
uniformitarianism
b.
cross-cutting relationships
c.
superposition
d.
original horizontality
Hint
9.
The __________ states that the processes that have been occurring today have been occurring since Earth formed.
a.
principle of uniformitarianism
b.
principle of original horizontality
c.
principle of cross-cutting relationships
d.
principle of superposition
Hint
