Homework # 4 Relative Dating
Section:
Name:
1.
Date:
The cross section below represents a portion of
Earth's crust. Letters A through D are locations
within the rock units.
5.
The sequence of rock types found in the walls
of the Grand Canyon are shown. The names
of rock formations are shown and the upper
and lower boundaries of each formation are
indicated by dashed lines. The rock layers have
not been overturned.
At which location is quartzite most likely
found?
A.
2.
A
B.
B
C.
C
The sequence of rock layers in the cross section
provides evidence that the Muave formation is
D. D
Base your answer(s) to the following question(s)
on the geologic cross section below, which
shows rock units 1 through 7 that have not been
overturned. Some of the rock units contain
New York State index fossils. An unconformity
exists between rock units 5 and 6.
A.
younger than the Temple Butte, but older
than the Bright Angel
B.
younger than both the Temple Butte and
the Bright Angel
C.
older than the Temple Butte, but younger
than the Bright Angel
D. older than both the Temple Butte and the
Bright Angel
Key
Basalt
Volcanic ash
Contact metamorphism
6.
The geologic cross section below shows bedrock
layers A through D. Line XY is a fault.
What evidence shown in the cross section
indicates that the basalt rock unit is the
youngest rock unit?
3.
4.
Bedrock from which entire geologic time period
is missing between rock units 5 and 6?
The fault most likely occurred after
Identify one metamorphic rock that could have
been formed by the contact metamorphism
within rock unit 1.
A.
all bedrock layers were formed
B.
layer C formed, but before layer D formed
C.
layer A formed, but before layer B formed
D. layer B formed, but before layer C formed
page 1
7.
Base your answer(s) to the following question(s)
on the cross section below. Rock units are
labeled 1 through 8. The line between A and
A' indicates an unconformity.
10.
The cross section of the bedrock layers of a
canyon is represented below. Letters A and B
represent rock layers on the sides of the canyon.
Layer A can best be correlated to layer B by
comparing the
A.
sediments on each side of the stream
B.
sequence of rock layers on each side of the
canyon
Which event occurred sometime after the
formation of the unconformity?
C.
organisms currently living in rock layers A
and B
A.
formation of rock unit 3
D. rate of erosion of rock layers A and B by
the stream
B.
tilting of rock unit 5
C.
deposition of the sediments that formed
rock unit 8
D. intrusion of rock unit 7
8.
9.
11.
Which characteristic of the granite intrusion
provides the most evidence that it solidi ed
deep underground?
A.
very hard
B.
C.
light color
D. felsic composition
Base your answer(s) to the following question(s)
on the block diagram below, which shows
bedrock units A through F and boundary XX 0 .
coarse texture
Earth has sedimentary bedrock of marine origin
that is four billion years old. Which inference
can be made from this information?
A.
Earth had oceans four billion years ago.
B.
Sedimentary rocks formed from magma
when Earth cooled four billion years ago.
C.
Most sedimentary rocks are at least four
billion years old.
The rock that formed in the contact
metamorphic zone between rock unit E and
rock unit D is
A.
hornfels
B.
marble
C.
schist
D. anthracite coal
D. Life existed on Earth four billion years
ago.
Section:
page 2
Homework # 4 Relative Dating
12.
Base your answer(s) to the following question(s)
on the geologic cross section of bedrock shown
below. A through G identify rock layers and Q
represents a fault. Lines W, X, Y, and Z are
locations of unconformities. The rocks have not
been overturned.
16.
Base your answer(s) to the following question(s)
on the geologic cross section below. Location A
is within the metamorphic rock.
Which rock is the youngest?
17.
Which rock or feature is oldest?
13.
A.
rock A
B.
rock G
C.
fault Q
D. unconformity Z
A.
shale
B.
sandstone
C.
igneous rock
D. rock at location A
Base your answer(s) to the following question(s)
on the cross section below and on your
knowledge of Earth science. The cross section
represents rock units that have not been
overturned. Lines CC0 and GG0 represent
unconformities. The geologic ages of some of
the lettered rock units are shown below the
cross section.
The movement of bedrock along fault Q most
probably produced
A.
gaps in the rock record
B.
an earthquake
C.
a volcanic lava ow
D. zones of contact metamorphism
14.
The unconformities shown in the cross section
represent
A.
buried erosional surfaces
B.
locations of index fossils
C.
volcanic ash deposits
The diagrams below represent three index
fossils found in one of the rock units.
D. boundaries between oceanic and continental
crust
15.
These fossils are most likely found in
Identify two processes that produced the
unconformity.
Section:
page 3
A.
rock unit I
B.
rock unit J
C.
rock unit K
D. rock unit M
Homework # 4 Relative Dating
18.
Base your answer(s) to the following question(s)
on the geologic cross section below in which
overturning has not occurred. Letters A
through H represent rock layers.
21.
Which two letters represent bedrock of the
same age?
A.
A and E
B.
C.
F and G
D. D and H
The cross section below represents four
di erent rock units. The symbol for contact
metamorphism has been omitted from the cross
section.
The sequence below represents the relative ages
of the rock units from oldest to youngest.
limestone ! granite ! shale ! sandstone
B and D
Which cross section below represents where the
symbol for contact metamorphism would be
located, based on the relative age sequence?
A.
19.
The diagram below represents three bedrock
outcrops. The layers have not been overturned.
Letters A through E identify di erent rock
layers. Fossils found in the rock layers are
shown.
B.
C.
Which fossil could be classi ed as an index
fossil?
A.
B.
C.
D.
D.
20.
Which scienti c principle states that younger
rock layers are generally deposited on top of
older rock layers?
a. superposition
b. evolution
c. original horizontality
d. includsion
Section:
page 4
Homework # 4 Relative Dating
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Section:
1.
Answer:
2.
Answer:
Homework # 4 Relative Dating
C
Basalt cuts across all other rock units. /
Contact metamorphism is shown between
the basalt and all rock layers.
3.
Answer:
Ordovician Period.
4.
Answer:
marble or hornfels
5.
Answer:
C
6.
Answer:
D
7.
Answer:
A
8.
Answer:
B
9.
Answer:
A
10.
Answer:
B
11.
Answer:
A
12.
Answer:
B
13.
Answer:
B
14.
Answer:
A
15.
Answer:
16.
Answer:
A
17.
Answer:
C
18.
Answer:
D
19.
Answer:
C
20.
Answer:
a.
21.
Answer:
A
09/28/2016