Three Types of Time Zones

Zane

Mrs. Troester

Expository Classification Essay

April 7,2017

Three Types of Time Zones

            The Earth is very old. In fact, the Earth is so old that it has a verity of time zones and these time zones have other time zones. We will be talking about the three main types of Time Zones. These Time Zones hold our Earth’s past life, like fossils, rocks, and how the Earth’s climate changed from having no oxygen  and no Ozone Layer, to supporting life not only in the water, but on land as well.

The First Time Zone that will be talked about is the Era. The Era, which are marked by worldwide changes in the types of fossils present. At the end of the Mesozoic Era, many kinds of invertebrates, birds, mammals, and reptiles became extinct.

The Next Time Zone After the Era are the Periods. Periods are units of geologic time characterized by the types of life existing worldwide at the time.

Periods can be divided into smaller units of time.

The next Time Zone after the Periods are the epochs. Epochs also are characterized by differences in life-forms, but some of these differences can vary from continent to continent. Epochs of periods in the Cenozoic Era have been given specific names. Epochs of other periods usually are referred to simply as early, middle, or late.

Now these Time Zones may have been unimportant to those who don’t even care about what the Earth has to offer, but if that is how everybody feels about our Earth and our Earth’s history, but when we do care about our Earth and our Earth’s history, there is no limit to what we could learn about our Earth and its wonders.