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Correlation Of Rock Layers
Test Description: Factors in fossil formation, correlation of rock layers by index fossils and volcanic ash.
Instructions: Answer all questions to get your test result.
1) Layers of volcanic ash often serve as useful geologic time markers because ash layers usually
A
can be sampled easily
B
are older than the surrounding rock
C
deposit quickly over a wide area
D
darken with age
2) Which kind of bedrock would most likely contain fossils?
A
a basalt lava flow from an ancient volcano
B
a high-grade metamorphic rock layer made from mixed igneous and sedimentary layers
C
a series of alternating layers of shale and sandstone
D
a mass of granite in the core of a mountain
3) In order for an organism to be used as an index fossil, the organism must have been geographically widespread and must have
A
lived on land
B
lived in shallow water
C
existed for a geologically short time
D
been preserved by volcanic ash
4) Sedimentary rock units several hundred kilometers apart could best be correlated by comparing the
A
fossils found in each rock unit
B
color and thickness of each rock unit
C
types of soil located above each rock unit
D
degree of weathering and erosion of each rock unit
5) A fossil is not likely to be found in
A
shale
B
basalt
C
sandstone
D
limestone
6) Which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area?
A
index fossils
B
cementing agent
C
texture
D
color
7) Which bedrock would be most likely to contain fossils?
A
Middle-Proterozoic quartzite
B
Cambrian shale
C
Pleistocene basalt
D
Precambrian granite
8) Which rock type most often contains fossils?
A
quartzite
B
limestone
C
metaconglomerate
D
gabbro
9) Which processes most often cause fossil evidence to be preserved in rock?
A
weathering and erosion
B
melting and faulting
C
deposition and cementation
D
folding and metamorphism
10) Living corals are found in warm, shallow seas. Coral fossils have been found in the sedimentary rocks of Alaska. These findings suggest that
A
coral usually develops in cold climates
B
Alaska once had a tropical marine environment
C
ocean currents carried the coral to Alaska
D
Alaska's cold climate fossilized the coral
*select an answer for all questions
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