Evolution

Archaean Era : 3800 ~ 2500 millions years ago

3800 BCE

Toxic atmospheric layer formed, appeared simple prokaryotes.

Proterozoic Era : 2500 millions ~ 570 millions years ago

2500 BCE

Having twice of ice age, Appears bacteria and marine plants

Cambrian Period : 570 ~ 500 millions years ago

570 BCE

Marine plants released oxygen and flourishing of invertebrate and trilobite

Ordovician Period : 470 to 444 millions years ago

470 BCE

Flourish of invertebrate animals and corals

Silurian Period : 430 to 416 millions years ago

430 BCE

Appears of jaw fish and land animals with vascular tissue, in this period invertebrate and Mollusca was major.

Devonian Period : 398 to 359 millions years ago

398 BCE

First appear of primitive angiosperm and club mosses. An ammonite was common in the sea.

Mississippian Period : 354 to 318 millions years ago

354 BCE

Appears of giant tree and reptiles on land. Chondrichthyes appeared in the sea.

Pennsylvania Period : 311 to 299 millions years ago.

311 BCE

Appears of winged insects and huge insects. Diversity of reptiles and flourishing of corals in marine environments

Permian Period : 270 to 251 millions years ago

270 BCE

Appears of Pangaea. Extinctions of permian leading 95% of organisms disappear.

Triassic Period : 245 to 199 millions years ago.

245 BCE

Dinosaurs, mammals, pterosaur and crocodile appeared and became common.

Jurassic Period : 175 to 145 millions years ago

175 BCE

Gymnosperm and pteridophyte plants appears and flourished. Birds and lizards appears. Lots of dinosaur were flourished; Stegosaurus.

Cretaceous Period : 99 to 65 millions years ago.

99 BCE

New dinosaurs appeared such as tyrannosaur, titanosaurus and triceratops.

Paleocene : 55 millions years ago

55 BCE

After extinction of dinosaurs, diversity of mammals had begun.

Eocene : 34 millions years ago

33 BCE

Starting of Ice age and appears of ancient mammals such as Creodont or Condylarth

Oligocene : 23 millions years ago

23 BCE

Warm temperature, animals especially mammals fast evolution and spreads.

Miocene : 5.3 millions years ago

5 BCE

Flourishing of ancestors of horses and elephants and appears of apes.

Pliocene : 1.8 millions years ago

2 BCE

Appears of Australopithecus

Pleistocene : 0.01 millions years ago

1 BCE

Evolution of present human being.

Holocene : Present

1 BCE

Ending of Ice Age and started civilization of human.