-
1 CE
USA's declaration if Independence
-
2
historical date of Jesus birth
-
10
humans appear
-
37
Primitive horses appear
-
38
Anthropoids appear
-
60
Primates appear
-
66
Great Extinction
Dinosaurs disappear -
Period: 66 to 1 CE
Cenozoic Era
-
144
Primitive birds appear
-
208
Great Extinction
mammals and dinosaurs appear -
245
Great Extinction
seed plants appear -
Period: 245 to 66
Mesozoic Era
-
286
Reptiles appear
-
360
Great Extinction
amphibians appear -
408
Land plants appear
-
438
Great Extinction
fish appear -
505
Marine Invertebrates appear
-
550
Cambrian Explosion
huge diversity and complexity increase in a relatively short period of time -
Period: 550 to 245
Paleozoic Era
-
650
Sexual Reproduction begins
-
650
Multicellular life appears
-
First eukaryotes appear
-
First Great Extinction
oxygen producing bacteria "poison" the environment, age of aerobic organisms begins -
First photosynthetic/autotrophic bacteria appear
-
Earliest evidence of life
-
Period: to 550
Precambrian Era