Geological Time Periods and Eras

The video provides an overview of the geological time scale, explaining how it describes the order and duration of major events on Earth over the last 4.5 billion years. It introduces the four major eons: Hadian, Archaean, Proterozoic, and Phanerozoic, and explains how these are subdivided into eras, periods, and epochs. The video highlights the significance of these divisions in understanding Earth's history and concludes with a mention of mnemonics to aid learning.

How old do scientists believe the Earth is?

• 10 billion years

• 1 billion years

• 100 million years

• 4.5 billion years

What is the largest division of geological time?

• Period

• Era

• Eon

• Epoch

Which eon is known for having no eras due to a lack of rocks?

• Hadian

• Archaean

• Proterozoic

• Phanerozoic

Which era is the oldest in the Phanerozoic eon?

• Cenozoic

• Paleozoic

• Proterozoic

• Mesozoic

How many periods are in the Paleozoic era?

• Five

• Three

• Four

• Six

Which period is not part of the Mesozoic era?

• Triassic

• Jurassic

• Cretaceous

• Permian

What is the youngest period in the Cenozoic era?

• Quaternary

• Tertiary

• Neogene

• Paleogene

Which epoch is the most recent in the Cenozoic era?

• Eocene

• Miocene

• Holocene

• Pleistocene

How many epochs are there in the Cenozoic era?

• Five

• Six

• Eight

• Seven

Which of the following is not an epoch in the Cenozoic era?

• Pliocene

• Carboniferous

• Oligocene

• Paleocene