-
-
4.5 billion years ago earth was formed. Earth was formed by collision of gian disk-shaped cloud of material. Comment: All timelines dates above are wrong read discription to find how long ago it was
-
3.5 billion years ago oxygen entered the earths atmosphere. Early bacterial life introduced oxygen to the atmosphere.
-
3.4 billion years ago was the first sign of life on earth.
-
2.1 billion years ago was the first eukaryote that ever exsisted on earth.
-
1.8 billion years ago was the first homosaipen said to be found on earth.
-
600 million years ago the first multicellular organism was found.
-
443.8 million years ago the mass extinction Ordovician-Silurian took place. this was the third largest extinction in Earth's history, the Ordovician-Silurian mass extinction had two peak dying times separated by hundreds of thousands of years. During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.
-
375 million years ago Late Devoninan took place. which is a mass exstinction. Three quarters of all species on Earth died out in the Late Devonian mass extinction, though it may have been a series of extinctions over several million years, rather than a single event.
-
270 million years ago Pangea was formed.
-
250 million years ago the mass extinction of permian took place. The Permian mass extinction has been nicknamed The Great Dying, since a staggering 96% of species died out. All life on Earth today is descended from the 4% of species that survived.
-
200 million years ago panegea began breaking up.
-
65 million years ago the Cretaceous-Tertiary mass extinction took place. The Cretaceous-Tertiary mass extinction - also known as the K/T extinction - is famed for the death of the dinosaurs. However, many other organisms perished at the end of the Cretaceous including the ammonites, many flowering plants and the last of the pterosaurs.
-
18 million years ago the Triassic-Jurassic mass extinction took place. During the final 18 million years of the Triassic period, there were two or three phases of extinction whose combined effects created the Triassic-Jurassic mass extinction event. Climate change, flood basalt eruptions and an asteroid impact have all been blamed for this loss of life.
