Geological time

By Mkarla Valdés
  • Period: 541 BCE to 252 BCE

    Paleozoic

    The Paleozoic or Paleozoic era is a division of the geological time scale that belongs to the Phanerozoic eon. The weather was still hot and humid. This favored the proliferation of increasingly complex organisms and their subsequent evolution.At this time invertebrates evolved and grew in number. During the first years, the life of the sea was limited to small animals, but then fish began to appear.
  • Period: 541 BCE to 485 BCE

    Cambrian

    In this period the "Cambrian Explosion" occurred. Plant and animal life was confined to the seas. The first snails and cephalopod mollusks appeared; also the first chordates. In the plant kingdom, algae predominated in the oceans and lichens on land. Their enormous proliferation contributed to the increase of oxygen in the Earth's atmosphere .Another fundamental evolutionary advance in the Cambrian was the formation of the first skeletons and exoskeletons. Rodina breaks up.
  • Period: 485 BCE to 444 BCE

    Ordovician

    The Ordovician is a stage that can be characterized by the passage of organisms from water to the mainland. With the appearance of the first plants, the lands began to be enriched in nutrients and to change their shape, giving at the end of the Ordovician an ecosystem rich in mosses and the first plants with vascular system appeared: ferns.In addition, the first great extinction occurred.
  • Period: 444 BCE to 419 BCE

    Silurian

    During this time the first land plants appeared. Silurian fossils show evidence of extensive reef construction and early signs that life is beginning to develop in freshwater and terrestrial ecosystems .Invación de la tierra por plantas, artrópodos, y vertebrados primitivos sin mandíbulas. Caledonian orogeny.
  • Period: 419 BCE to 359 BCE

    Devonian

    It is known as the Age of Fish, as it produced a considerable variety of mainly freshwater fish, early trees and early amphibians.
  • Period: 359 BCE to 299 BCE

    Carboniferous

    Ferns were the dominant plant group, abundant sharks and crinoids, early reptiles. Pangea forms.
  • Period: 299 BCE to 252 BCE

    Permian

    Radiation from reptiles, which displace amphibians as the dominant group, widespread glaciation occurred. Hercynian orogeny.
  • Period: 252 BCE to 201 BCE

    Triassic

    Domain of flowering plants extinction of large reptiles and ammonites at the end of the period.
  • Period: 201 BCE to 145 BCE

    Jurassic

    Dominant reptiles on land, sea and air, first birds, archaic mammals, the dominant plants on the surface of the earth were gymnosperms, diversity of dinosaurs first aquatic reptiles and flying. Pangea begins to break up.
  • Period: 145 BCE to 66 BCE

    Cretaceous

    Early dinosaurs, turtles, ichthyosaurs, cycad plesiosaurs and dominant conifers. First flowering plants, mass extinction of dinosaurs by meteorite impact and ammonites. Large rise in the eart's sea level, warm climate in all parts of the globe.
  • Period: 66 BCE to 20

    Cenozoic

    It is a division of the geological time scale, known as "The Age of Mammals". Its most important feature has been evolution.
  • Period: 66 BCE to 2 BCE

    Tertiary

    Rise of birds and placental mammals. Alpine orogeny begins.
  • Period: 2 BCE to 20

    Quaternary

    Modern species of mammals ,extintion of large forms, such as mammoth, dominance of human. Glaciation in the Northern Emisphere
  • Period: 252 to 66

    Mesozoic

    During the course of this time some current vertebrates, flowering plants and a staggering number of insects appear, in addition to the appearance, development and extinction of dinosaurs.The weather was warmer and more humid.