8th Geological Time Scale - Fossil Record

Eras are subdivided into ________.

• eons

• periods

• epochs

• land bridges

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What is an eon?

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

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

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

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

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Division of periods in geological history

• Eons

• Epoch

• Era

• Law of Superposition

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

• era

• eon

• epoch

• period

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Which fossil is the youngest?

• fossil A

• fossil B

• fossil C

• fossils A and B are the same age

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What is the importance of studying fossils?

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

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

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

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Chronological chart that shows the events and past lives of organisms in Earth's history.

• Geological Time Scale

• Cambrian Explosion

• Eon

• Era

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NGSS.MS-LS4-1

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

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

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

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

• fossil

• endangered

• extinct

• dinosaur

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