Geological Time Scale and Mass Extinctions

This chronological time chart is broken into different time chunks, the largest being the Eon, then Era, Period, and Epoch.

• Timeline

• Calendar

• Geological time scale

• Time chart

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Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

In what time period did Pangaea, the super continent, appear?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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The Permian mass extinction occurred about 248 million years ago. It was the greatest mass extinction ever recorded in

Earth's history. About ninety-five percent of all marine species became extinct as a result of the Permian extinction.

Although scientific theories vary, it is believed that _____________________ caused the Permian mass extinction.

• global warming

• an asteroid hitting Earth

• he introduction of dinosaurs

• the start of glaciation and climatic changes

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Periods during Earth's history when huge numbers of species suddenly disappeared are called...

• Variations

• Mass extinctions

• Period conclusions

• Isolations

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Which extinction is considered the largest mass extinction in Earth's history? Basically 96% of all species on Earth disappeared.

• Ordovician Extinction

• Devonian Extinction

• Permian Extinction

• Triassic Extinction

• Cretaceous Extinction

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What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct

• When multiple species from all over the earth suddenly go extinct 

• When one species goes extinct due to habitat changes

• When all life on earth is wiped out 

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NGSS.MS-LS4-1

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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NGSS.MS-LS4-1

Geologists assume the newest rock layers are on top of the older ones, unless some type of disturbance occurs, in known as …

• Law of Inclusions

• Law of Crosscutting

• Law of Conservation

• Law of Superposition

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