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Fossils and Geologic Time
Fossils and Geologic Time
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Review for Fossil and Geologic Time Test in Earth Science
Flashcards
33 cards
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Questions
33
Answers
1
The oldest rocks are at the bottom of an undisturbed rock sequence by using the principle of
Cross-cutting relationships
Superposition
Original horizontality
Uniformitarianism
2
The relative age of a rock layer that contains intrusion is
Younger than the source of the intrusion
Older than the source of the intrusion
Older than the layer below it
The same as the intrusion that cuts across it
3
You can tell that a fault is younger than the rock it cuts across by applying the principle of
Original horizontality
Superposition
Cross-cutting relationships
Uniformitarianism
4
According to scientist estimates, Earth is approximately
4.5 billion years old
450 million
4.5 million years old
4.5 thousand years old
5
What era ended with a 90% mass extinction event that scientist have no idea what happened.
Mesozoic
Cenozoic
Paleosoic
Phanerozoic
6
Which era is know as, "The Time of the mammals"...
Phanerozoic
Cenozoic
Paleosoic
Mesozoic
7
This period of time ranges from hundreds of thousands to several millions of years.
Epoch
Era
Eon
Period
8
This period of time ranges from millions of years to tens of millions of years.
Period
Eon
Epoch
Era
9
In an undisturbed rock sequence, the youngest rock layer is located
Below the sedimentary rock layer.
At the top of the sequence.
Below the unconformity.
At the bottom of the sequence.
10
What are the possibilities of the extinction of the dinosaurs?
Climate change or Chuck Norris killed them
Aliens
Comet, Disease or Climate Change
They're not dead, just hiding and ordering take-out
11
By measuring the radioactive isotopes of Carbon 14 we can find the "actual age" of a rock
False
True
12
The Precambrian has taken up what percent of Earth's history.
60%
90%
85.5%
50%
13
Which of the following list the time scales in order from LONGEST to shortest
Epoch, period, era, eon
period, eon, era, epoch
Eon, Era, Period, Epoch
Eon, Epoch, Era, period
14
The history of Earth is divided by groups of time. The longest period of time is an
Epoch
Period
Eon
Era
15
An example of a fossil with altered hard parts include(hard parts been replaced with minerals)
gastroliths
petrified wood
mummified human body
saber-toothed tiger in tar
16
Which era is know as, "The Time of the Dinosaurs"...
Paleozoic
Phanerozoic
Mesozoic
Cenozoic
17
Particles eroded from an underlying rock layer that gets incorporated into the new layer?
Fossils
Unconformities
Sills
inclusions
18
Sample of wood has 12.5% of its original isotopes and its 1/2 life is 100 years, how old is it?
125,000 years old
75 years old
300 years old
250 years old
19
Index fossils are useful to geologist if the fossils
have lived over a short period of time
are scarce
are not widely distributed geograhically
are not easily recognized
20
The principle that states, sedimentary rocks are deposited in horizontal layers is principle of
Cross-cutting relationships
Uniformitarianism
Original horizontality
Superposition
21
The history of Earth is divided by groups of time. The shortest period of time is an
Era
Period
Eon
Epoch
22
The principle of superposition can be used to determine
the relative densities of these rock layers
the relative age of these rock layers
the actual temperature of these rock layers
the actual age of these rock layers
23
Intrusions are younger than the rocks they cut across.
IDK
False
True
24
Eons are shorter than Eras.
False
True
25
Which layer is the youngest?
3
1
2
6
26
Amount of time it takes for one-half of the original amount of an isotope to decay is known as
half-life
correlation
radioactivity
period
27
The order from youngest to oldest is
3,1,6,4,5,2
3,1,6,2,5,4
3,1,6,2,4,5
3,2,1, 6,5,4
28
Evolution is the process by which organisms
leave behind evidence of their existence
digest and grind their food
adapt to changes in their environments
become preserved by mineral replacement
29
The principle that states that the processes ocuring today since Earth formed is
Uniformitarianism
Superposition
Original horizontality
Unconformity
30
An example of a trace fossil includes a
raindrop impression
mud crack
cast of a clam
worm trail
31
Which of these is used to determine the absolute age of a rock?
relative-age dating
radiometric dating
permineralization
correlation
32
Carbon 14 is used to determine the age of what type of materials?
lava or magma flows
igneous rock
inorganic materials
organic materials
33
Geologists have organized the events of Earth’s history and represented them on the
Uniformatarianism
Geologic Time Line
Period
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