ESRT Pg 8 & 9

Front

What is the most recent Eon in Earth's geologic history?

Back

Phanerozoic

Front

Name the three Eras found in the Phanerozoic Eon.

Back

Cenozoic, Mesozoic, Paleozoic

Front

How many millions of years ago did the earliest amphibians first appear?

Back

359 million years ago (mya), during the late Devonian period of the Paleozoic Era.

Front

Which of the following three organisms existed the shortest: mammals, birds, ammonoids?

Back

Mammals.

Front

Put the following organisms in order of how long they lived on Earth, starting with the longest: trilobites, dinosaurs, ammonoids, mastodons.

Back

Ammonoids, Trilobites, Dinosaurs, Mastodons.

Front

What is the significance of the Phanerozoic Eon in Earth's history?

Back

It is characterized by abundant fossil evidence and the presence of complex life forms.

Front

What major events mark the boundaries of the Paleozoic Era?

Back

The Cambrian Explosion and the Permian-Triassic extinction event.

Front

What are the defining characteristics of the Mesozoic Era?

Back

It is known as the age of reptiles, including dinosaurs, and is marked by the breakup of Pangaea.

Front

What major extinction event occurred at the end of the Mesozoic Era?

Back

The Cretaceous-Paleogene (K-Pg) extinction event.

Front

What is the time frame of the Cenozoic Era?

Back

It began 66 million years ago and continues to the present.