Geologic Time Periods

This is the present eon. It began about 541 million years ago.

• Phanerozoic

• Cenozoic

• Quarternary

• Holocene

Tags

NGSS.MS-ESS1-4

This is the present era. It began about 66 million years ago.

• Cenozoic

• Phanerozoic

• Quarternary

• Holocene

Tags

NGSS.MS-ESS1-4

This is the present period. It began about 2.6 million years ago.

• Quarternary

• Phanerozoic

• Cenozoic

• Holocene

Tags

NGSS.MS-ESS1-4

These are the smallest main unit of geologic time. Periods are broken up into these.

• epochs

• eons

• eras

• unconformities

This is the present epoch. It began about 11,600 years ago.

• Holocene

• Phanerozoic

• Cenozoic

• Quarternary

Which graph shows the relative duration of geologic time for Earth's history?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ESS1-4

The Law of Superposition states

• Younger rocks layers are on top of older rock layers

• Fossils are found in sedimentary rocks

• Older rock layers are on top of younger rock layers

• Absolute age dating

Tags

NGSS.MS-ESS1-4

Which era was the longest, taking up 88% of geologic time?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Tags

NGSS.MS-ESS1-4

Which is the youngest rock layer?

• Siltstone

• Conglomerate

• Mudstone

• Limestone

Tags

NGSS.MS-ESS1-4

Which of the following organizes the divisions of geologic time from longest to shortest?

• eons, eras, periods, epochs

• epochs, periods, eras, eons

• periods, eons, epochs, eras

• eras, epochs, eons, periods

Tags

NGSS.MS-ESS1-4