Environmental History Vocabulary

noun a geological era that began 65 million years ago and continues to the present, characterized by the development of mammals and birds

• The Cenozoic era is also known as the Age of Mammals, spanning from 66 million years ago to the present.
• The Cenozoic era is when all the cool animals like mammoths and saber-toothed tigers lived.
• The Cenozoic era was like the ultimate party for mammals, they were living it up!
• The Cenozoic era was like the dawn of a new age for life on Earth, with so many evolutionary changes taking place.

adjective relating to or characteristic of the Aftonian glacial stage in North America, which occurred approximately 1 million years ago

• The aftonian period refers to a specific time in geological history.
• I read about the aftonian era in my science class.
• The aftonian is like ancient history in the world of rocks.
• His knowledge of the aftonian era is as deep as the Grand Canyon.