Timeline of the earth eras.

By lucarodperrod
  • Period: 4600 BCE to 560 BCE

    precambrian

    Guide fossil: Estromatolites
    Geologycal events:Appeareance of Rodinia
    Climate events: Average temp. (4000º - 12º)
  • 3800 BCE

    Origin of life

    The first forms of life were unicellular bacterias, without an especific core. They were anaerobic ( didn´t use oxygen) and heterotroph ( fed of inorganic matter).
  • Period: 560 BCE to 250 BCE

    Paleozoic

    Guide fossil: Trilobites
    Geological events: Pannotia fracture
    Climate events: second glatiation
  • 540 BCE

    arthropds and cephalopds

    there was the first forms of life in develop an exoesqueleton and a soft body.
  • 500 BCE

    Start fish era

    During the orvodician period, exist primitive fishes or agnates fishes (fishes without jaw), and ostracoderms fishes ( armored fishes)
  • 435 BCE

    First lands plants

    the first plants were similar to mosses, they were very simple and non vascular and grow in wet floors (Liver).
  • First bony fish
    395 BCE

    First bony fish

    This fishes after develop lunges, swim bladders, and bony skeleton.They were formed two groups : fishes with ray fins and lobed fins.
  • First reptils
    310 BCE

    First reptils

    they fed from bugs and lived in marshy atmosphere, his succes comes from the ways they reproduced,putting amniotic eggs on land.
  • Formation of Pangaea
    280 BCE

    Formation of Pangaea

    Pangea occurs because of tectonic plates shock, and fusioned continental masses.
  • Period: 250 BCE to 66 BCE

    Mesozoico

    Guide fossil: Ammonites, Belemmites
    Geological event: Pangea fracture
    Climate event: posible impact of a meteorite
  • First dinosaurs and mammals
    225 BCE

    First dinosaurs and mammals

    The firsts dinosaurs were very small creatures bipedal and they reproduced by amniotic eggs, about the mammals, they were simple, nocturnal and they fed of bugs.
  • Domine of plants
    145 BCE

    Domine of plants

    During the hurassic period, the wet and humid climate, let the plants envolved and expand, givind food to the herbivorous dinosaurs
  • Domine of dinosaurs
    100 BCE

    Domine of dinosaurs

    Due to the adaption of the dinosaurs in the cretaceous period, they developed bigger digestive system and specialized teeths.
  • Period: 66 BCE to 24 BCE

    Cenozoic

    Guide fossil: numulites
    Geological event: Cotinue the separation of Pangea
    Climate event: Appear first mountains ranges.
  • Terror birds
    65 BCE

    Terror birds

    As the dinosaurs died for the massive extintion, the birds start to become biggers until reasing meatures of 10 feet.
  • Megadolons and mammuths
    3 BCE

    Megadolons and mammuths

    Megalodons were giant prehistoric sharks but the increment of the temperature in the ocean and competrition wiyh others predators finished with they . Mammoths were big mammals too like elephants, but the hunted of them, by the human for food and materials became the extinct for them.
  • Human evolution and expansion
    1 CE

    Human evolution and expansion

    The mammipheres start to evolve to primates and then to homo abilis... the first hominid comes from Africa and then it started to expand.