Tertiary Period: The Start Of A “Age Of Mammals”

It’s hard to imagine, but there was a time when people didn’t exist. A time when we didn’t have any need for tools or language because all of the work that we needed to do as humans was done by animals. NO LONGER! The “age of mammals” is how scientists like to describe the time period around 70 million years ago when we started evolving into primates and eventually humans. This article takes a look at this age through fossil records and mentions some other interesting things that happened during this time, such as the start of the tertiary period. 

The tertiary period is a time period that covers the years from 65.5 to 1 million years ago. This was an age of great change, both for our planet and for life on it. During this time, we began to evolve into primates, and eventually humans. We saw the start of the tertiary period with the arrival of the first primates in North America about 45 million years ago. Other events that took place during this time include the start of the Quaternary period, which is when we started seeing ice age cycles; and the extinction of many species of dinosaurs.

How long did the Tertiary period last?

The Tertiary period lasted for approximately 65 million years. It began around 65.5 million years ago and ended around 5.3 million years ago. 


“Tertiary Period.” The Geological Time Scale. British Geological Survey, 22 Mar. 2010. Web. 24 Apr. 2016.

What happened to the dinosaurs during the period of time?

The tertiary period is the start of a “age of mammals”. During this time, many things changed for the dinosaurs. Some scientists say that global warming caused the extinction of the dinosaurs. Other scientists say that other animals, like the asteroid, killed most of them. It is still unknown what really happened to them.

What are some characteristics that mammals have?

Mammals are characterized by four primary characteristics: warm blooded, hairy, bipedal, and having a brain. Mammals evolved from therian mammals, which are animals that have scales or hair on their bodies and live in cold environments. The four primary characteristics of mammals are an adaptation to warm environments and an increase in brain size.

How is a Tertiary Period different from a Secondary Period?

The Tertiary Period is a period of Earth’s history that is made up of the Paleogene and Neogene epochs. The Paleogene Period is the time period between the Cretaceous-Paleogene extinction event and the start of the Neogene Period. The Neogene Period is the time period from the end of the Paleogene Period to present. The Tertiary Period is different from the Secondary Period because during the Secondary Period, there was an increase in animal life. However, during the Tertiary Period, there was a decrease in animal life. 

Why were there no mammals during the Secondary Period?

The Secondary Period was a time when the Earth was without mammals. Scientists aren’t sure why this was, but it seems that something happened to prevent mammals from developing during this time. It’s possible that there were no suitable environments for them to live in or that they simply didn’t evolve enough. Whatever the reason, it was a gap in Earth’s history that we now know about and can learn from. 

What kinds of animals did exist during the Secondary Period?

During the Secondary Period, there were a variety of different animals living on Earth. Some of these animals included amphibians, reptiles, and mammals. However, there was a gap in the history of mammals, so we don’t know much about them. Scientists are hoping to learn more about this period and its animals in the future, so that we can better understand how they evolved and what role they played in Earth’s history.

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