Four Eras of Geologic History

Question 1

What did the Precambrian Era form

Answer 1

Formation of the Canadian Shield

Earliest life forms (single-celled organisms)

Question 2

What did the Paleozoic era form

Answer 2

Formation of sedimentary rock from shallow seas

Development of marine life, fish, and early land plants

Question 3

What did the Mesozoic era form

Answer 3

Formation of the Western Cordillera and Interior Plains

Dinosaurs and first birds

Question 4

What did the Cenozoic era form

Answer 4

Ice Age shaped landforms through glaciation

Mammals and humans evolved