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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
darken with age
B
are older than the surrounding rock
C
can be sampled easily
D
deposit quickly over a wide area
2) Which kind of bedrock would most likely contain fossils?
A
a series of alternating layers of shale and sandstone
B
a mass of granite in the core of a mountain
C
a basalt lava flow from an ancient volcano
D
a high-grade metamorphic rock layer made from mixed igneous and sedimentary layers
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 in shallow water
B
lived on land
C
been preserved by volcanic ash
D
existed for a geologically short time
4) Sedimentary rock units several hundred kilometers apart could best be correlated by comparing the
A
types of soil located above each rock unit
B
degree of weathering and erosion of each rock unit
C
color and thickness of each rock unit
D
fossils found in each rock unit
5) A fossil is not likely to be found in
A
sandstone
B
basalt
C
shale
D
limestone
6) Which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area?
A
texture
B
color
C
cementing agent
D
index fossils
7) Which bedrock would be most likely to contain fossils?
A
Middle-Proterozoic quartzite
B
Pleistocene basalt
C
Precambrian granite
D
Cambrian shale
8) Which rock type most often contains fossils?
A
quartzite
B
metaconglomerate
C
gabbro
D
limestone
9) Which processes most often cause fossil evidence to be preserved in rock?
A
deposition and cementation
B
folding and metamorphism
C
melting and faulting
D
weathering and erosion
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
ocean currents carried the coral to Alaska
C
Alaska's cold climate fossilized the coral
D
Alaska once had a tropical marine environment
*select an answer for all questions
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