Geologic Time

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

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

• A
• B
• C

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons

Which is the most recent era of time- the one that we are currently in?

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

What principle proves Layer 1 is younger than 2.

• superposition
• crosscutting
• inclusions
• horizonality

How do most fossils form?

• Living things die and their remains are covered by sediment
• The hard parts of an organism dry out in the air
• The soft parts of an organism change to stone
• Freezing preserves the remains of an organism

Relative dating of rock layers tells us that the deeper we dig, _______.

• the younger the rocks get
• the smellier the rocks get
• the harder the rocks get
• the older the rocks get

Which fossil is an impression left by the original organism?

• cast
• mold
• trace
• preserved remains

The best index fossils have which two traits?

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