Index fossils

An organism that no longer exists on Earth is called

• Decayed
• Evolved
• Extinct
• Preserved

_{Which rock layer contains the newest fossils?}

• F
• E
• B
• C

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

The best index fossils have which two traits?

• widespread geographically, long lifespan
• widespread geographically, short lifespan
• specific place, long lifespan
• specific place, short lifespan

One of the oldest organisms discovered is called a(n) _________.

• dinosaur
• micro-organism
• trilobite
• cast and mold fossil

According to the law of superposition, which layer is the youngest?

• A
• B
• C

_{Which rock layer in the diagram seems to be the oldest?}

• F
• E
• B
• A

Which rock layer most likely contains fossils of the most recently evolved organisms?

• 1
• 2
• 3
• 4

To be considered an index fossil, it had to have lived for a relatively short period of time.

• True
• False

What type of fossil is an imprint in a rock?

• cast 
• trace 
• mold
• whole/part