Unit 6 - Geologic Time

Question 1

Pre-Cambrian Supereon

Answer 1

Makes up for 87% of all time of the earth!!! 4.6 bya (which the formation of earth) - 541 mya (with the start of the Cambrian Period)

Question 2

Phanerozoic Eon

Answer 2

542 mya - present

Question 3

Paleozoic Era

Answer 3

542 - 252 mya
- First part of the Phanerozoic Eon
- Known for explosion of diversity in marine organisms
- Mass extinction marks end of era when 90% of marine animal species were wiped out

Question 4

Mesozoic Era

Answer 4

252 - 65.5 mya
-middle of the Phanerozoic Eon
- extinction of dinosaurs marked the end of this era

Question 5

Cenozoic Era

Answer 5

65.5 mya - present