geologic era Flashcards
1
Q
What is Precambrian?
A
Canadian Shield was created
- first living organisms
- many cycles of mountain building and erosion
2
Q
What is Paleozoic?
A
- Canadian Shield worn down by erosion
- sedimentary rock forced upwards creating the Appalachian Mountains
- living organisms including fish, shellfish, amphibians
3
Q
What is Mesozoic?
A
- eastern Arctic and Innuitian Mountains formed
- warm climate creating huge swamps and forests
- living organisms including dinosaurs and reptiles
4
Q
What is Cenozoic?
A
- final changes giving Canada its present landforms
- four ice ages
- dinosaurs died out, human beings became dominant species
5
Q
What is geologic era is Canada in?
A
Cenozoic
