Question

Choose the correct order:

• A. Eon → Epoch → Era → Period
• B. Eon → Era →Epoch → Period
• C. Period → Eon →Era → Epoch
• D. Eon → Era → Period → Epoch

Answer 1

The correct option is D

Eon → Era → Period → Epoch

The largest defined unit of time in geological scale is the supereon which is composed of eons. Each eon is made up of around a billion years, and is divided into eras. Eras comprise of several hundred million years and are further divided into periods, comprised of tens to one hundred million years. Periods are further divided into epochs which are made up of tens of millions of years.