Geological Eras Flashcards
1
Q
What is the order of the eras? (earliest to latest)
A
Precambrian, Paleczoic, Mesozoic, Cenozoic
2
Q
What was the longest era?
A
Precambrian ( 88% )
[4.6 bya - 570 mya ]
3
Q
What was the shortest era?
A
Cenozoic ( 1% )
[65 mya - now]
4
Q
What is the Precambrian era?
A
[4.6 bya - 570 mya ]
- longest area ( 88%)
- only singular / multi celluar organisms exist
- sponges & jellyfish
- canadian shield forms
5
Q
What is the Paleozoic era?
A
[570 mya - 245 mya ] ( 7% )
- Sedimentary rocks form
- age of marine life
- Mountains form
- largest mass extinction wiping out 96% marine life
- sharks & fish
6
Q
What is the Mesozoic era?
A
[245 mya - 65 mya ] (4%)
- era of dinosaurs
-western cordillera begins
- 65 mya dinosaurs got extinct
7
Q
What is the Cenozoic era?
A
[65 mya - now] (1%)
- era of animals
- cats dogs, horses, rabbits, monkeys
- lucy
- end of ice age
- start of human race
8
Q
What was the closest ancestor to us humans?
A
Australopithecus Afarensis
(LUCY)
