Geological Time Units

Question 1

What are the Geological time units from biggest to smallest?

Answer 1

Eon, era, periods, epochs, ages

Question 2

How many eons are there?

Answer 2

4

Question 3

How many eras are there?

Answer 3

10

Question 4

How many periods are there?

Answer 4

22

Question 5

How many epochs are there?

Answer 5

34

Question 6

How many ages are there?

Answer 6

99

Question 7

How long is an eon?

Answer 7

1/2 billion years or more

Question 8

How long is an era?

Answer 8

Several hundred million years

Question 9

How long is a period?

Answer 9

10-100 million years

Question 10

How long is an epoch?

Answer 10

10’s of millions of years

Question 11

How long are ages?

Answer 11

Millions of years