La tierra, supongo

Biological histoy of the Earth

By Friofrioo
  • Period: 4600 BCE to 541 BCE

    Precambrian

    Guide fossil: Stromatolites. Geological event: The tectonic plates start moving
    The supercontinent Rodinia is formed. Climate event: There were many glaciation
  • 3800 BCE

    1st life forms→ 4:10 h

    1st life forms→ 4:10 h
    The first type of living beings were unicellular and prokaryotic. These organisms were bacteria, the simplest form of life.
    As an example we have the stromatolites, a type of cyanobacteria that are now fossilized and look like rocks.
  • 635 BCE

    1st most complex life forms→ 9:07 h

    1st most complex life forms→ 9:07 h
    The cyanovacteria and the rest of early life started evolving, creating more pluricellularcand eukaryotic forms of life. AS an example of this evolution we can find the Dickinsonia, along other life forms.
  • 541 BCE

    Great explosion of life→ 21:10 h

    Great explosion of life→ 21:10 h
    The change of estate of the atmosphere from a reducing atmosphere to a oxidizing atmosphere that happened during the precambrian, allowed the explosion of life thanks to the gigantic amount of oxygen.
    Many new species appeard, but ultimately, they would all die during the three firsts mass extintions.
  • Period: 541 BCE to 252 BCE

    Paleozoic

    Guide fossil: Triboleites. Geological event: As Rodiania fragmentates, Pangea is formed.
    Sea leve rises.
    Higher volcanic activity
    Climate event: Global warming.
    Many glaciations
  • 485 BCE

    Age of the fish→ 21:37 h

    Age of the fish→ 21:37 h
    The marine enviroment that was predominet in the precambrian gave way to an explosion of sea life, it was the Age of Fish.
    This age ended with the Precambrian and the appereance of amphibians.
  • 443 BCE

    First terrestrial plants (gymnosperms) → 21:48 h

    First terrestrial plants (gymnosperms) → 21:48 h
    After the millions of life in the sea, the living beings start moving to the land.
    Oone of the prime examples are the firts plants. These plants were gymnosperm,in other words, asexual plants because they did not have flower
  • 359 BCE

    Amphibian age → 22:13 h

    Amphibian age → 22:13 h
    The amphibians appeared during the devonian period, around 419 million years ago. It was the first living beings that needed to live on land to search for food, but need the water to lay their eggs, hence their name, from the greek "amphi" (both) and "bios" (life).
  • 299 BCE

    Age of the reptiles → 22:43 h

    Age of the reptiles → 22:43 h
    After many years of evolution, during the carboniferous, the reptiles appeared. Their first characteristic to differentiete them from the amphibians, is that the reptiles only live on land, the first animals to do so. These animals are col-blooded, thus they need the sun to warm and be ablo to move.
    They would be the main species during the permian period.
  • Period: 252 BCE to 66 BCE

    Mesozoic

    Guide fossil: Amonites Geological event: Pangea brakes. Climate event: Low sea level and high temperatures.
    No glaciations
  • 201 BCE

    1st angiosperms→ 23:22 h

    1st angiosperms→ 23:22 h
    Plants, just like animals, evolve, but unlike them, the plants evolved but not entierely. Many gymnosperms evolved to be angiosperm. The changes between these types are that the newer form reproduces by pollen that is transported by many factos, like bees, wind or water. The most efective ways are the bees, this is the reasopn behind the colours that this type of flower has.
  • 145 BCE

    Age of the birds→ 23:39 h

    Age of the birds→ 23:39 h
    After many mass extintions, along with the dinosours, the birds appeared during he jurraic period. Their golden age lasted during the cretaceus, around 145 million years ago.
  • Period: 66 BCE to 1 BCE

    Cenozoic

    Guide fossil: Numulites Geological event: End of the continental drift.
    Alpine range is formed.
    Formation of the polar ice caps. Climate event: 4 small glaciations alternated with hot periods.
  • 6 BCE

    1st hominids→ 23:53 h

    1st hominids→ 23:53 h
    The early hominids were just like the other types, but for survivasl purpuses, our ancestors started waliking in two legs.The astroloithecus started to exist around 6.000.000 million years ago in modern-day Ethipia.
    As time moved on so did the early humans, as they started populating all corners of the Earth and evolving to our today species.
  • 3 BCE

    1st Homo sapiens→ 23:59 h

    1st Homo sapiens→ 23:59 h
    The first homo sapiens, the current form of the human beings appeared around 300.000 years ago in many places around Africa.
    It is the most widely spreaded hominid and can be found in all continents with a population of 7.8 billion people mainly concentrated in southeast Asia.