Geologic Time Scale Activity
Introduction
Understanding geologic time is critical to relating events in Earth’s history to those of today.
Scientists use several forms of the geologic time scale to classify the age of objects and to
become familiar with other events occurring simultaneously. Choose one of the options listed in
the procedures below to complete this assignment.
Materials
If you would like to create your geologic time scale by hand, you will need the materials listed.
Note: There are alternative procedures that do not require these materials.
Adding machine paper, or pieces of paper taped together to form a continuous line
ruler or meter stick
tape
colored pencils, crayons, or markers
digital camera, mobile device, or laptop camera to take a photograph of your time scale
Procedures:
Option 1 Procedures with materials
1. Cut a piece of adding-machine tape approximately 4.6 meters long or attach pieces of
paper in a continuous line using tape so it is approximately 4.6 meters long.
2. Tape the ends of your paper onto your table so it is easier to measure and label.
3. Label your paper “Geologic Time Scale” at the top left.
4. At the top right of your paper, include the following scale:
1 meter 1 billion geologic years (1 bya)
1 10 million geologic years (10 mya)
centimeter
1 millimeter 1 million geologic years (1 mya)
5. Starting from the left side of the paper, measure 5 centimeters to the right and draw a
vertical line. Label the line “today”.
6. Plot each era, period, and important event on the paper using the scale provided and
Table 1 below.
7. When you have completed your geologic time scale model, take an image of it and place
it into this document for your instructor to view.
Option 2: Procedures without materials
There are many different types of models. A timeline is one way to represent the
, geologic time scale, but there are other ways as well.
1. Below Table 1, you have been provided with the geological time scale. The time
scale is an approximation and is not to scale.
2. You will need to complete the scale by recording the significant biological and
geological events. You will need to identify at least two biological and two
geological events for each period. You may need to perform additional
research to gather your information to complete the time scale.
3. After you have completed the time scale answer the Reflection Questions.
Reflection Questions
Do not answer until you have completed the time scale located on the page following
Table 1.
1. How long (in centimeters and years) was the Precambrian period compared to the rest
of the scale?
About the same
2. How many years and “centimeters” of time separated the dinosaurs and humans on
Earth?
240mya (24.0 cm)
3. How many years and centimeters of time passed before life appeared on Earth?
33mya (3.30 cm)
4. For how many years of geologic time have humans existed?
7mya
5. Did dinosaurs exist at the same time as mammals? Explain your answer using the
geologic time scale. No, they did not. 65my passed after the dinos were extinct before
mammals appeared
Table 1
Complete the total time column for the table below to assist with answering the reflection
questions. The first one has been completed for you.
bya= billion years ago
mya= million years ago
1cm= 10 million years
Introduction
Understanding geologic time is critical to relating events in Earth’s history to those of today.
Scientists use several forms of the geologic time scale to classify the age of objects and to
become familiar with other events occurring simultaneously. Choose one of the options listed in
the procedures below to complete this assignment.
Materials
If you would like to create your geologic time scale by hand, you will need the materials listed.
Note: There are alternative procedures that do not require these materials.
Adding machine paper, or pieces of paper taped together to form a continuous line
ruler or meter stick
tape
colored pencils, crayons, or markers
digital camera, mobile device, or laptop camera to take a photograph of your time scale
Procedures:
Option 1 Procedures with materials
1. Cut a piece of adding-machine tape approximately 4.6 meters long or attach pieces of
paper in a continuous line using tape so it is approximately 4.6 meters long.
2. Tape the ends of your paper onto your table so it is easier to measure and label.
3. Label your paper “Geologic Time Scale” at the top left.
4. At the top right of your paper, include the following scale:
1 meter 1 billion geologic years (1 bya)
1 10 million geologic years (10 mya)
centimeter
1 millimeter 1 million geologic years (1 mya)
5. Starting from the left side of the paper, measure 5 centimeters to the right and draw a
vertical line. Label the line “today”.
6. Plot each era, period, and important event on the paper using the scale provided and
Table 1 below.
7. When you have completed your geologic time scale model, take an image of it and place
it into this document for your instructor to view.
Option 2: Procedures without materials
There are many different types of models. A timeline is one way to represent the
, geologic time scale, but there are other ways as well.
1. Below Table 1, you have been provided with the geological time scale. The time
scale is an approximation and is not to scale.
2. You will need to complete the scale by recording the significant biological and
geological events. You will need to identify at least two biological and two
geological events for each period. You may need to perform additional
research to gather your information to complete the time scale.
3. After you have completed the time scale answer the Reflection Questions.
Reflection Questions
Do not answer until you have completed the time scale located on the page following
Table 1.
1. How long (in centimeters and years) was the Precambrian period compared to the rest
of the scale?
About the same
2. How many years and “centimeters” of time separated the dinosaurs and humans on
Earth?
240mya (24.0 cm)
3. How many years and centimeters of time passed before life appeared on Earth?
33mya (3.30 cm)
4. For how many years of geologic time have humans existed?
7mya
5. Did dinosaurs exist at the same time as mammals? Explain your answer using the
geologic time scale. No, they did not. 65my passed after the dinos were extinct before
mammals appeared
Table 1
Complete the total time column for the table below to assist with answering the reflection
questions. The first one has been completed for you.
bya= billion years ago
mya= million years ago
1cm= 10 million years
