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Geological Time Scale

Total questions: 80

Worksheet time: 1hrs 20mins

Name
Class
Date
1.

How many eons are there in geological time measurement?

a)

1

b)

2

c)

3

d)

4

2.

Which of the following is the subdivisions of eon?

a)

Era

b)

Period

c)

Epoch

d)

Age

3.

Why are fossils of organisms of the Archaeozoic era not found?

a)

Because they had soft bodies.

b)

Because they had spiny bodies.

c)

Because they had hard bodies.

d)

None of above

4.

About how many years ago did the Earth emerge.

a)

4.6 billion years ago

b)

10 billion years ago

c)

3.0 billion years ago

d)

20 billion years ago

5.

What was the source of energy at the time of origin of life?

a)

Heat, Cosmic Rays and Lightning

b)

Only Heat

c)

Only Rays

d)

Only Light

6.

If you go back about 4500 million years from today, when the atmosphere was reducing, how were the organisms at that time?

a)

Autotrophs, aerobic

b)

Chemo-autotrophs, Anaerobic

c)

Chemoheterotrophs, Anaerobic

d)

Heterotrophs, Anaerobic

7.

In which era did unicellular organisms originate?

a)

Paleozoic era

b)

Proterozoic era

c)

Archeozoic era

d)

Mesozoic era

8.

Which is the universal principle of organic evolution?

a)

Natural Selection

b)

Phase theory

c)

Synthesis theory

d)

Mutationism

9.

Which of the following did not have life?

a)

In Azoic era

b)

In Mesozoic era

c)

In Paleozoic era

d)

In Cenozoic era

10.

What is the main purpose of the geologic time scale?

a)

To organize the major eras of Earth's history

b)

To compare very short and very long periods of time

c)

To complete with other, non-geologic time scales

d)

To help people understand that the planet is really old

11.

Place the following units in order, from smallest to largest.

a)

Eon, epoch, period

b)

Period, eon, epoch

c)

Epoch, eon,period

d)

Epoch, period,eon

12.

Generally speaking, which rock layers are the oldest?

a)

The thinnest ones

b)

The thickest ones

c)

The ones furthest from the surface

d)

The ones closest to the surface

13.

What can you conclude from the fact that there have been just four eons in Earth's history

a)

Eons are very short periods of time

b)

Eons always last less than 1 billion years

c)

Geologists only began naming eons recently

d)

There have been at least eight periods in earth's history.

14.

What event might mark the end of a period?

a)

The fact that 100 million years had elapsed since the end of the previous period

b)

A major geologic change

c)

The appearance of one new species

d)

The gradual drifting of the continents

15.

How would the human time scale be different if we measured it in relative, instead of specific, time? Choose the best answer.

a)

Days would be longer than months

b)

One week might be longer or shorter than the next

c)

No one would know what time it was

d)

The future would occur before the past and present

16.

What does a Stratigraphist study?

a)

Dinosaurs

b)

Time

c)

Rock layers

d)

The formation of the earth

17.

How does radiometric dating differ from the ages of the geologic time scale?

a)

Radiometric dating involves absolute dates; the geologic time scale is measured with relative dates

b)

Radiometric dating can only be used on fossils; the geologic time scale applies only to rocks

c)

Radiometric dating involves unstable, radioactive isotopes; the geologic time scale deals only with stable rocks and compounds

d)

Radiometric dating involves relative dates; the geologic time scale is measured with absolute dates

18.

The second broadest category of geologic time is______________?. The Cenozoic is one of them.

a)

era

b)

eon

c)

epoch

d)

period

19.

Describes a group of living things that are no longer living.

a)

fossil

b)

endangered

c)

extinct

d)

dinosaur

20.

The geologic time scale is divided into four large units known as

a)

Eras

b)

Periods

c)

Eons

d)

Units

21.

In which eon do we know there was no life?

a)

Carboniferous

b)

Hadean

c)

Miocene

d)

Tithonian

22.

What is an eon?

a)

 Long span of geologic time. In formal usage, the longest portions of geologic time.

b)

the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed.

c)

very long span of geologic time; in formal usage, the second longest portions of geological time.

d)

Unit of geological time during which a rock series is deposited.

23.

What is an era?

a)

Long span of geologic time. In formal usage, the longest portions of geologic time.

b)

the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed.

c)

very long span of geologic time; in formal usage, the second longest portions of geological time.

d)

Unit of geological time during which a rock series is deposited.

24.

When did the formation of the moon occur?

a)

Hadean

b)

Archean

25.

When did the formation of the earth occur?

a)

Hadean

b)

Archean

26.

When was the first ocean formed?

a)

Hadean

b)

Archean

27.

Which one of these is not an era in the Phanerozoic Eon?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Proterozoic

28.

Which eon has the extinction of dinosaurs?

a)

Phanerozoic

b)

Archean

c)

Proterozoic

d)

Hadean

29.

Humans evolved in what eon?

a)

Hadean

b)

Phanerozoic

c)

Archean

d)

Proterozoic

30.

Which one of the units is an Epoch?

a)

Paleocene

b)

Cenozoic

c)

Triassic

d)

Cambrian

31.

Which of the following periods occurred first (is the oldest)?

a)

Cretaceous

b)

Triassic

c)

Jurassic

d)

Permian

32.

Mesozoic is an example of an:

a)

epoch

b)

eon

c)

era

d)

period

33.

What does Phanerozoic mean?

a)

Visible Life

b)

Micro Life

c)

Microscopic Life

d)

Middle Life

34.

What are the three eras of the Phanerozoic?

a)

Hadean, Archean, Proterozoic

b)

Triassic, Jurassic, Cretaceous

c)

Paleozoic, Mesozoic, Cenozoic

d)

Cambrian, Triassic, Paleogene

35.

Which one of the units is a Period?

a)

Pliocene

b)

Paleozoic

c)

Pleistocene

d)

Paleogene

36.

How is relative time recorded?

a)

Moon

b)

Mountains

c)

Sand

d)

Rocks

37.

In which time period are we currently living?

a)

Precambrian Time

b)

Paleozoic Era

c)

Mesozoic Era

d)

Cenozoic Era

38.

Dinosaurs, small mammals, and birds are found in this time period.

a)

Precambrian Time

b)

Paleozoic Era

c)

Mesozoic Era

d)

Cenozoic Era

39.

What is the importance of studying fossils?

a)

to provide information about how current life forms would exist in previous environmental conditions

b)

to provide information about how life and environmental conditions may have changed

c)

to provide information about how previous life forms would exist in current environmental conditions

40.

Geologists assume the newest rock layers are on top of the older ones, unless some type of disturbance occurs, in known as …

a)

Law of Inclusions

b)

Law of Crosscutting

c)

Law of Conservation

d)

Law of Superposition

41.

Determines the “relative” order of past events but not the absolute age.

a)

Absolute age

b)

Relative age

c)

Real age

d)

New age

42.

Uses the decay of radioactive elements to find the ___________________________ of a rock or fossil.

a)

Relative age

b)

Absolute age

c)

New age

d)

Real Age

43.

These specialized fossils indicate to geologists the boundaries in geological time and determine the age of rocks.

a)

Index fossils

b)

Limestone fossils

c)

Amber fossils

d)

Cast fossils

44.

This chronological time chart is broken into different time chunks, the largest being the Eon, then Era, Period, and Epoch.

a)

Timeline

b)

Calendar

c)

Geological time scale

d)

Time chart

45.

History of life as documented by all fossils, preserved in sedimentary rock strata is known as the _________________________.

a)

Rock record

b)

Fossil record

c)

Geology record

d)

Petrified record

46.

Preserved remains of plant and animals from the remote past are called _______________.

a)

Rocks

b)

Dinosaurs

c)

Strata

d)

Fossils

47.

The end of life for a group of organisms, usually a species, is called a(n) ________________.

a)

Extinction

b)

Retirement

c)

Endangerment

d)

Catastrophe

48.

What division of time was the longest ?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Precambrian

49.

Which of the following is the subdivisions of eon?

a)

Era

b)

Period

c)

Epoch

d)

Age

50.

The following make up the 3 periods of the mesozoic era:

a)

Triassic

b)

Jurassic

c)

Cretaceous

d)

Permian

51.

The shape shown in the figure below is named_____________.

a)

Glacial grooves

b)

moon

c)

Pangea

d)

Pterosaurs

52.

_____________ were dominant Mesozoic land vertebrates that walked with legs positioned directly below their hips

a)

Dinosaurs

b)

Glacial grooves

c)

Pterosaurs

d)

Plesiosaurs

53.

_____________ were Mesozoic flying reptiles with large, bat like wings

a)

Dinosaurs

b)

Glacial grooves

c)

Pterosaurs

d)

Plesiosaurs

54.

______________ the two periods of Cenozoic

a)

Quaternary period and Tertiary period

b)

ordivion and devonian

c)

Cretaceous-Tertiary

d)

Triassic-Jurassic

55.

In what time period did Pangaea, the super continent, develop?

a)

Precambrian Time

b)

Paleozoic Era

c)

Mesozoic Era

d)

Cenozoic Era

56.

In which type of rock are fossils found?

a)

igneous rock

b)

sedimentary rock

c)

punk rock

d)

hard rock

57.

Events in Earth's crust that were the result of violent or sudden changes.

a)

Uniformitarianism

b)

Law of Superposition

c)

Catastrophism

d)

The Great Dying

58.
What was Pangea?
a)
An ancient Mountain Range that divided Africa
b)
A large valley where civilization began.
c)
A supercontinent where all Earth's land masses were joined.
d)
A large meteor that hit Earth and destroyed all of the dinosaurs
59.
The Mesozoic Era was the Age of Reptiles, and the current Cenozoic Era is the Age of
a)
Birds
b)
Ice
c)
Mammals
d)
Humans
60.
The _________ was an era dominated by the dinosaurs
a)
Precambrian
b)
Paleozoic
c)
Mesozoic
d)
Cenozoic
61.
What is the definition of Geologic Time Scale ?
a)
A record of the geologic events and life forms in Earth’s history
b)
Fossils of widely distributed organisms that lived during only one short period.
c)
A fossil that is a copy of an organism’s shape, formed when minerals seep into a mold
d)
Fossils of widely distributed organisms that lived during only one short period.
62.
Known as the age of the mammals?
a)
Mesozoic Era
b)
Holocene Epoch
c)
Cenozoic Era
d)
Cambrian
63.
Which shows the correct order of Geologic Time units from longest to shortest?
a)
Eon - Period - Epoch - Era
b)
Era - Epoch - Eon - Period
c)
Eon - Era - Period - Epoch
d)
Period - Eon - Epoch - Era
64.
3. In what time period did Pangaea, the super continent, appear?
a)
A. Precambrian Time
b)
B. Paleozoic Era
c)
C. Mesozoic Era
d)
D. Cenozoic Era
65.
States that younger rocks lie above older rocks if the layers have not been disturbed
a)
Law of crosscutting
b)
Law of superposition
c)
Relative Dating
d)
Unconformity
66.
A break in the geologic record that is made when rock layers are eroded over a long period of time
a)
Law of Superposition
b)
Law of Crosscutting
c)
Relative Dating
d)
Unconformity
67.
How does the law of crosscutting explain the age of a fault?
a)
The fault is younger than the rocks above it.
b)
The fault is younger than the rocks it cuts through.
c)
The fault is older than the rocks above it.
d)
The fault is older than the rocks it cuts through.
68.
What are the relative ages of the features in order from oldest to youngest?
a)
Limestone, Basalt, Fault, Siltstone
b)
Siltstone, Fault, Basalt, Limestone
c)
Limestone, Fault, Basalt, Siltstone
d)
Limestone, Siltstone, Fault, Basalt
69.
The age of a rock compared to the ages of other rocks is the rock's
a)
absolute age
b)
geologic age
c)
sedimentary age
d)
relative age
70.
Analyze the seashell found in the white layer.  Which statement is true of the rock layer that contains this fossil?
a)
It could also contain a fossil from the bottom layer.
b)
It is older than the layers below it.
c)
It is younger than the layers above it.
d)
It is older than the layers above it.
71.
Used to determine whether an object is older or younger than other objects
a)
Superposition
b)
Relative Dating
c)
Fossil
d)
Unconformity
72.

Relative dating determines the

a)

precise age of fossils

b)

age of rock layers and fossils compared to others

c)

climate fossils survived in

d)

movement of continents

73.

How does absolute age differ from relative age?

a)

Only absolute dating indicates which rock is older than another

b)

Only absolute dating finds the age in years

c)

Only relative dating finds the age in years

74.

The __________of rocks is the numerical age and real age of rocks.

a)

relative age

b)

half-life

c)

absolute age

d)

earth age

75.

Geologist use _________ to determine the absolute age of rocks.

a)

absolute age dating

b)

relative age dating

c)

radiation dating

d)

radioactive dating

76.

All organisms contain the element_________, so it is used to find the ages of fossils.

a)

carbon-14

b)

carbon-12

c)

carbon

d)

carbon age

77.

Geologist use the time it takes for a radioactive isotope to decay to half its original mass called a___________.

a)

radioactive decay

b)

isotope

c)

half-life

d)

carbon dating

78.

A long-lived natually occurring radioactive carbon isotope:

a)

half-life

b)

Isotope

c)

Carbon-12

d)

Carbon-14

79.

Using the graph, How much Carbon-14 does a 10,000 yr old fossil emit?

a)

10 %

b)

20 %

c)

30 %

d)

40 %

80.

How much Carbon-14 would a foosil that is 6,000 yrs old?

a)

about 40%

b)

about 50%

c)

about 60%

d)

about 70%

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