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Blackline Master 1
Who Dunit?



(used with permission from Steve Dutch, Univ. of Wisconsin, Green Bay)

Someone took the last cookie in the cookie jar last night.

The last person to leave the scene is the culprit. Who was it?

Clues:

The Butler walks to work.

The Handyman rides a bike.

The Cook rides a motorcycle.

The Maid drives a car.

The Nephew has a seeing-eye dog.


Blackline Master 2

Fossil Cards



Courtesy of http://www.ucmp.berkeley.edu/fosrec/BarBar.html#SETB with permission for educational uses.


Courtesy of http://www.ucmp.berkeley.edu/fosrec/BarBar.html#SETB with permission for educational uses.

Blackline Master 3

Fossil Information



Courtesy of http://www.ucmp.berkeley.edu/fosrec/BarBar.html#SETB with permission for educational uses.

Blackline Master 4

Layers and Laws Student Activity Sheet

Engage: Who Dunit?

Who do you think the culprit is? ______________________________


What evidence do you see that leads you to this conclusion? ___________________________________
________________________________________________________________________________________________________________________________________________________________________
Explore/Explain

Index fossils are fossils that are preserved in the rock record of the Earth and are specifically found in a particular time period or environment. These fossils are also called, guide fossils. What can the index fossils tell you about the organisms in the layers of rock with them, above them, or below them? ______
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Based on the information that is given about each type of fossil, what can you infer about the type of environment these fossils may have lived in? _______________________________________________

What evidence did you use to make your inference? _________________________________________


____________________________________________________________________________________

Are your oldest fossils and rock layers on the top or the bottom of your model? _____________________

Why did you arrange them this way? ______________________________________________________
____________________________________________________________________________________

The Law of Superposition states that in a series of sedimentary rock layers, the oldest layer is at the bottom, and layers from there upward become younger and younger. How is this related to how you organized your fossils and rock layers? ____________________________________________________


________________________________________________________________________________________________________________________________________________________________________

Think about your laundry. How might the Law of Superposition apply to which clothes have been in your laundry the longest (the oldest) and which clothes have been in your laundry the shortest (the youngest)? __________________________________________________________________________


________________________________________________________________________________________________________________________________________________________________________
Draw a picture that represents the Law of Superposition. Label the picture with which layers are the oldest and which layers are the youngest.

Blackline Master 5

Superposition Answer Guide for Fossil Cards
Figure 2-B. Stratigraphic Section for Set B (use as answer key)



Courtesy of http://www.ucmp.berkeley.edu/fosrec/BarBar.html#SETB with permission for educational uses.

Blackline Master 6

Layers and Laws Checking for Understanding



  1. Using the diagram above, which layer would contain the oldest fossils? (SC.7.E.6.3)

  1. Layer A

  2. Layer C

  3. Layer D

  4. Layer E




  1. Scientists can learn all of the following by studying fossils EXCEPT: (SC.7.E.6.4)

a. How life forms have changed over time

b. How the environment has changed over time

c. How the Earth’s surface has changed over time

d. How the surrounding rock layers have changed over time




  1. What evidence did scientists use to develop the Law of Superposition? (SC.7.N.1.6)

a. Fossils only

b. Rock layers only

c. Rock layers and fossils

d. Fossils and environment




  1. A new fossil is found in a rock layer in England. How can index fossils be used to help date the approximate age of the new fossil? (SC.7.E.6.4)

    1. Scientists use radioactive dating to get the exact age of the new fossil.

    2. Scientists compare the new fossil directly to known fossils to find its age.

    3. Scientists use the fossils around the new fossil to compare to known fossils.

    4. Scientists ask other scientists to date the fossils based on known information.



Blackline Master 6 – Answer Keys

Layers and Laws Student Activity Sheet – Answer Key

Engage: Who Dunit?

Who do you think the culprit is? student responses will vary. Correct answer is nephew walking dog


What evidence do you see that leads you to this conclusion? student responses will vary but should include that these foot prints were over top all of the others, indicating that it happened most recently.
Explore/Explain

Index fossils are fossils that are preserved in the rock record of the Earth and are specifically found in a particular time period or environment. These fossils are also called, guide fossils. What can the index fossils tell you about the organisms in the layers of rock with them, above them, or below them? student responses will vary but should include that index fossils can tell you that the organisms in the same layer are approximately the same age and lived at approximately the same time, fossils in layers on top of the index fossils are younger, fossils in the layers below the index fossils are older.
Based on the information that is given about each type of fossil, what can you infer about the type of environment these fossils may have lived in? student responses will vary but should point to the idea that this was an aquatic environment.

What evidence did you use to make your inference? student responses will vary but should include that there is mention on the “Fossil Information” page that the students were “swimmers” or lived in “aquatic” or “marine” environments. There are many mentions of “fish” which students should recognize as living in water.

Are your oldest fossils and rock layers on the top or the bottom of your model? student responses will vary. Correct answer is that the oldest rock layers are at the bottom.

Why did you arrange them this way? student responses will vary but should include an explanation that newer layers cannot be layed until older layers are already established.


The Law of Superposition states that in a series of sedimentary rock layers, the oldest layer is at the bottom, and layers from there upward become younger and younger. How is this related to how you organized your fossils and rock layers? student responses will vary but should include that putting the fossil layers in order from the oldest layers that talk about “extinct” organisms to the more recent organisms that say “still in existance” follows the law of superposition that oldest layers are on the bottom and newest layers are on the bottom.
Think about your laundry. How might the Law of Superposition apply to which clothes have been in your laundry the longest (the oldest) and which clothes have been in your laundry the shortest (the youngest)? student responses will vary but could include that the oldest laundry is in the bottom. Every time the student dirties more clothes, they get put on top of the older, dirty clothes. The ones on the bottom have been in the laundry the longest, the ones on top the shortest.

Draw a picture that represents the Law of Superposition. Label the picture with which layers are the oldest and which layers are the youngest. student drawings may vary but should generally look like this:





Checking for Understanding – Answer Key



  1. Using the diagram above, which layer would contain the oldest fossils? (SC.7.E.6.3)

  1. Layer A

  2. Layer C

  3. Layer D

  4. Layer E




  1. Scientists can learn all of the following by studying fossils EXCEPT: (SC.7.E.6.4)

a. How life forms have changed over time

b. How the environment has changed over time

c. How the Earth’s surface has changed over time

d. How the surrounding rock layers have changed over time


  1. What evidence did scientists use to develop the Law of Superposition? (SC.7.N.1.6)

a. Fossils only

b. Rock layers only



c. Rock layers and fossils
d. Fossils and environment


  1. A new fossil is found in a rock layer in England. How can index fossils be used to help date the approximate age of the new fossil? (SC.7.E.6.4)

  1. Scientists use radioactive dating to get the exact age of the new fossil.

  2. Scientists compare the new fossil directly to known fossils to find its age.

  3. Scientists use the fossils around the new fossil to compare to known fossils.

  4. Scientists ask other scientists to date the fossils based on known information.




Layers and Laws page

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