Geological Time

How old do Paleontologists believe the Earth is?

• 2015 years old

• 3.6 billion years old

• 4.6 billion years old

• 4.6 million years old

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

• Mesozoic 

• Paleozoic 

• Cenozoic 

• Precambrian 

Preserved remains of plant and animals from the remote past are called _______________.

• Rocks

• Dinosaurs

• Strata

• Fossils

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

• era

• eon

• epoch

• period

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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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Which of the following periods occurred first (is the oldest)?

• Cretaceous

• Triassic

• Jurassic

• Permian

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Earth is thought to be formed ______ years ago?

• 200 thousand

• 4.6 billion

• 3 million

• 13.8 billion

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The geologic time scale is divided into four large units known as

• Eras

• Periods

• Eons

• Units

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In which eon do we know there was no life?

• Carboniferous

• Hadean

• Miocene

• Tithonian

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