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Precambrian time
4,600 million years ago, the atmosphere weak, only bacteria. -
Cambian
542 million years ago, dramatic succession start Earth's evolutions -
Ordovician
488 million years ago, North tropics are completely wide of ocean. -
Silurian
444 million years ago, mass ice formations contributing to rising sea levels. -
Devonian
416 millions years ago, plants and animals form several plant species evolve -
Carboniferous, mississippian period
359 million years ago, mass sediment deposition in mississippi -
carboniferous, pennsylvanian period
318 million years ago, amphibians reach natural length, example: 7 meters -
Permain
299 million years ago, diversification spread of mammals, turtles, repidasauras, archosars. -
Triassic
251 million years ago, flying vertebra, weak version. -
Jurassic
200 million year ago, pangea separation begins rapidly moving. -
Cretaceous
146 million years ago, high sea levels create shallow inland seas. -
Paleocene
65.5 million years ago, extinction of non-avian dinosaurs and marine reptiles begin. -
Eocene
55.8 million years ago, extremely weak most mass extinctions occur. -
Oligocene
33.9 million years ago, tropical ecosystems advance, grasslands advance. -
Miocene
23 million years ago, warmer global climates miocene arise -
Pilocene
5.3 million years ago, continents move movements w/ changing temperatures -
Pleistocene
1.8 million years ago, ice age ends more advanced humid societies form. -
Holocene
0.0115 million years ago, warming age; 12,000 years old glaciers to glaciers from today melt. -
Anthropocene
Current date, human activities have impact on Earth's geology and economy.
