Geography

Geological ages

Geological ages


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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

AgesPeriodsSeasonsTime elapsed in yearsCharacteristics
CenozoicQuaternaryHolocene
Pleistocene
11.000
1.000.000
Man and glaciation in the northern hemisphere.
TertiaryPliocene
Mitocene
Oligocene
Eocene
Paleocene
12.000.000
23.000.000
35.000.000
55.000.000
70.000.000
Mammals and Phanerogams (*)
MesozoicCretaceous
Jurassic
Triassic
135.000.000
180.000.000
220.000.000
Gigantic and coniferous reptiles
PaleozoicPermian
Carboniferous
270.000.000
350.000.000
Amphibians and cryptograms (**)
Devonian400.000.000Fish and vegetation on the continents
Silurian
Ordovician
Cambrian
430.000.000
490.000.000
600.000.000
Invertebrates and large numbers of fossils: aquatic life
Upper PrecambrianAlgonquianRare remains of bacteria, fungi, algae, sponges, crustaceans and coelenterates (***)
Middle PrecambrianMore than two billionRare 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.



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