History of the Earth.

By Hainara___2006
  • Precambian.
    4500 BCE

    Precambian.

    It covers almost 90% of the history but the testimonies of events of the time are scarce because they have been destroyed or disappeared with the different geological events.
  • Guide fossils :stromatolites (cyanobacteria)
    4500 BCE

    Guide fossils :stromatolites (cyanobacteria)

    They are calcium carbonate formations created by the photosynthetic activity of some bacteria, such as cyanobacteria.
  • Climate event: first glaciations
    4500 BCE

    Climate event: first glaciations

    They were the longest in history.
  • Biological events:first life forms
    3800 BCE

    Biological events:first life forms

    They have been found among rocks and thanks to them it has been ruled that the earth is much older than we thought.
  • Eukaryotic cells (multicellular organisms).
    2500 BCE

    Eukaryotic cells (multicellular organisms).

    It happened thanks to the increase in oxygen that was released in the atmosphere and oceans.
  • Paleozoic Age fish and amphibian.
    541 BCE

    Paleozoic Age fish and amphibian.

    It was the time when the greatest explosion of life arose.
  • Biological events: Great explosion of life.
    541 BCE

    Biological events: Great explosion of life.

    Algae and invertebrates appear.
  • Climate event: hot and humid climate.
    541 BCE

    Climate event: hot and humid climate.

    This led to the creation of large forests of conifers and ferns and the appearance of first reptiles.
  • Guide fossils :arthropods
    541 BCE

    Guide fossils :arthropods

    the explosion was an event of diversification of species of great magnitude and importance. of life
  • First of fish .
    443 BCE

    First of fish .

    Appearance of fish and colonization of the terrestrial environment appearing the first gymnosperm.
  • First amphibians.
    419 BCE

    First amphibians.

    This was due to the creation of an ozone layer that protects against ultraviolet radiation.
  • Mesozoic Age of the reptil.
    252 BCE

    Mesozoic Age of the reptil.

  • Guide fossild:Dinosaurs
    252 BCE

    Guide fossild:Dinosaurs

    Colonice terrestrial and aquatic environments
  • Biological event:first insects and mammals
    252 BCE

    Biological event:first insects and mammals

    Small and nocturnal mammals. the first dinosaurs and first social insects.
  • Climate event: Dry and arid climate
    252 BCE

    Climate event: Dry and arid climate

  • Evolution of marine life
    201 BCE

    Evolution of marine life

    Accumulation of seedling, first birds and angiosperm flowers.
  • Extinction of species
    145 BCE

    Extinction of species

    Produced by a meteorite and intense volcanism.
  • Cenozoic: Age of mammals.
    66 BCE

    Cenozoic: Age of mammals.

  • Climate events: four glaciations alternating with warm periods.
    66 BCE

    Climate events: four glaciations alternating with warm periods.

  • Biological events:
    66 BCE

    Biological events:

    First birds, marsupials and placentals.
  • 23 BCE

    First deciduous trees.

    Herbaceous plants develop, diversification of mammals and birds.
  • First hominids and homosapiens.
    2 BCE

    First hominids and homosapiens.