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Geological History Flashcards | StudBud
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Geological History
Geological History
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Flashcards
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1
What is an example of an index fossil?
amber
fern leaf
trilobites
2
Which is not a technique of absolute dating
examining radioactive elements
examining tree rings
examining varves
examining superposition
3
What type of lava do non-explosive volcanoes have?
basalt lava
high silica lava
4
88% of geologic time occurred in the
Precambrian era
Cenozoic era
Paleozoic era
Mesozoic era
5
What is the law of cross-cutting relationships?
sediments deposit in horizontal position
in undisturbed rock, the youngest is on top
a layer of rock that cuts through another is younger
6
Which era do we live in?
Paleozoic
Mesozoic
Cenozoic
Precambrian
7
What epoch do we live in?
Holocene
Pleistocene
Piliocene
Eocene
8
A missing section of time in the rock record
half-life
intrusion
extrusion
unconformity
9
What are two characteristics of index fossils?
one found in one region, organism existed for short time
found in many places, organism existed for short time
found in many places, organism exists presently
10
When was the first mass extinction?
end of the precambrian era
end of the mesozoic era
end of the paleozoic era
11
Which type of unconformity is this?
disconformity
nonconformity
angular conformity
12
What theory was believe that caused the second mass extinction?
Flooding due to increased ocean levels
Asteroid collides with Earth
Volcanic activity
Spread of disease
13
Varves are commonly found
near ice sheets and glaciers
in the desert
near volcanoes
in mountain ranges
14
Which part of this geologic column is the oldest?
4
3
2
1
15
Put the following units of time in order from broadest to most specific.
era, period, epoch
period, era, epoch
era, epoch, period
16
Absolute dating which predicts the time it takes ½ the parent element to decay
examining varves
examining radioactive decay
examining layers of rocks
examining tree rings
17
What is the law of superposition?
sediments deposit in horizontal position
in undisturbed rock, the youngest is on top
a layer of rock that cuts through another is younger
18
The type of dating that compares a rock's age with another.
Relative dating
Absolute dating
19
What type of rock is commonly found in geological columns
sedimentary
metamorphic
igneous
20
Lava hardening on the surface is an example of a(n)
Intrusion
Extrusion
Fault
21
If tree rings are close together this indicates
impossible to tell
poor growing conditions
good growing conditions
22
Which period do we live in?
Jurrasic
Carboniferous
Quaternary
Tertiary
23
Where are most fossils found in Virginia
Blue Ridge Mountains
Coastal Plains
Ridges and Valleys
Piedmont
24
The law of fragments states that a piece of rock in another rock is
younger than the surrounding rock
older than the surrounding rock
