-
3650 BCE
E
Earliest evidence of life (heterotrophic, prokaryotic bacteria) 3,650 MYA -
2500 BCE
F
First photosynthetic/ autotrophic bacteria appear 2,500 MYA -
2200 BCE
G
First Great Extinction, oxygen-producing bacteria "poison" the environment, age of aerobic organisms begins 2,200 MYA -
1750 BCE
H
First Eukaryotes appear 1,750 MYA -
650 BCE
I
Sexual Reproduction begins 650 MYA -
650 BCE
J
Multicellular life appears 650 MYA -
550 BCE
K
"Cambrian Explosion" --huge diversity and complexity increase in a relatively short period of time-- 550 MYA -
Period: 550 BCE to 3650 BCE
D
Precambrian Time -
505 BCE
L
Marine invertebrates appear 505 MYA -
438 BCE
M
Great Extinction, fish appear 438 MYA -
408 BCE
N
Land plants appear 408 MYA -
360 BCE
O
Great Extinction, amphibians appear 360 MYA -
286 BCE
P
Reptiles appear 286 MYA -
245 BCE
Q
Great Extinction, seed plants appear 245 MYA -
Period: 245 BCE to 66 BCE
B
Mesozoic Era -
Period: 245 BCE to 550 BCE
C
Paleozoic Era -
208 BCE
R
Great Extinction, mammals and dinosaurs appear 208 MYA -
144 BCE
S
Primitive birds appear 144 MYA -
66 BCE
T
Great Extinction, dinosaurs disappear 66 MYA -
Period: 66 BCE to 1 CE
A
Cenozoic Era -
60 BCE
U
Primates appear 60 MYA -
38 BCE
V
Anthropoids (day-active primates) appear 38 MYA -
37 BCE
W
Primitive horses appear 37 MYA -
1 CE
X
Humans appear 0.1 MYA -
1 CE
Y
Historical date of Jesus birth 0.002 MYA -
1 CE
Z
USA's declaration of independence 0.0002 MYA