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For the study of the natural history of the planet to be carried out, its age was divided into eras, periods, seasons, ages and stages.
The table below gives us an idea of the main events of each era.
Geologic Scales of Time
|Ages||Periods||Seasons||Time elapsed in years||Characteristics|
|Man and glaciation in the northern hemisphere.|
|Mammals and Phanerogams (*)|
|Gigantic and coniferous reptiles|
|Amphibians and cryptograms (**)|
|Devonian||400.000.000||Fish and vegetation on the continents|
|Invertebrates and large numbers of fossils: aquatic life|
|Upper Precambrian||Algonquian||Rare remains of bacteria, fungi, algae, sponges, crustaceans and coelenterates (***)|
|Middle Precambrian||More than two billion||Rare fossiliferous evidence, bacteria and fungi (?)|
|Lower Precambrian (Archeozoic)||Archean (Beginning of the Earth)||(4.5 billion)|
(*) vegetables whose reproductive organs are very evident (flowers, for example)
(**) non-flowering vegetables
(***) aquatic animals, usually marine, such as jellyfish and corals.