Timeline of Life on Earth

Timeline created by monicaresta
  • Precambrian Era 3.5 Billion Years Ago

    Precambrian Era 3.5 Billion Years Ago
    The Precambian Era is Earth's first era of time. This Era is divided in three periods: the Azoic, Archeozoic and the Vendian.
    All Precambrian life forms were simple one-cell to simple multi-cell creatures. These life forms were blind, brainless and soft bodied creatures, and they had no hard skeleton.
  • Oxygen entered in Atmosphere 3.52 billion BC

    Oxygen entered in Atmosphere 3.52 billion BC
    Early bacterial life introduced oxygen to the atmosphere. As the first free oxygen was released through photosynthesis by cyanobacteria, it was initially soaked up by iron dissolved in the oceans and formed red coloured iron oxide, which settled to the ocean floor. Over time, distinctive sedimentary rocks called banded iron formations were created by these iron oxide deposits. Once the iron in the oceans was used up, the iron oxide stopped being deposited and oxygen was able to start building up
  • First Cynobacteria appear 2.8 Billion Years Ago

    First Cynobacteria appear 2.8 Billion Years Ago
    Fossil evidence of Cyanobacteria indicates an age of up to 2.8 billion years
  • First Eukaryotes Appear - 1.2 Billion Years Ago

    First Eukaryotes Appear - 1.2 Billion Years Ago
    Approximately 1.5 billion years ago, in an oxygen-containing atmosphere, the first eukaryotes came into being. Eukaryotes have a nucleus, a nuclear membrane, a number of organelles, a ribosomal structure different from that of prokaryotes, reproduction by mitosis, and other features that distinguish them from prokaryotes.
  • Cambrian Period 540 - 505 Million Years Ago

    Cambrian Period 540 - 505 Million Years Ago
    The Cambrian Period is the time when the major groups of animals first appear in the fossil record. This event is often called the "Cambrian Explosion," because of the short time over which this diversity of forms appears. It was thought that Cambrian rocks contained the first and oldest fossil animals.
  • First Plats Appear - 500- 400 Million years ago

    First Plats Appear - 500- 400 Million years ago
    The hypothesis is that 400 million years ago freshwater, green, filamentous algae invaded the land. These probably had an isomorphic alternation of generations and were probably heterotrichous.
  • Ordovician Period 505 - 445 Miliion Years Ago

    Ordovician Period 505 - 445 Miliion Years Ago
    The Ordovician Period lasted 45 million years. During this period, the area north of the tropics was almost entirely ocean.
    The Ordovician is best known for the first multicellular organisms that apperared its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts.
  • First Vertebrates Appear - 500 Million Years Ago

    First Vertebrates Appear - 500 Million Years Ago
    The first vertebrates, or animals with internal skeletons, developed in the water on earth about 500 million years ago.
  • Silurian Period 438 - 408 Million Years

    Silurian Period 438 - 408 Million Years
    The Silurian was a time when the Earth had important repercussions for the environment and life. One result of these changes was the melting of large glacial formations. It was when plants and fungi moved onto land.
  • First Animals Appear on Land 417 Million Years Ago

    First Animals Appear on Land 417 Million Years Ago
    About 417 million years age during the Devonian era. As for creationism there are skeletons of humans who are much older than 6000 years. Fossils are facts, creationism is a myth.
  • Devonian Period 408 - 360 Million Years Ago

    Devonian Period 408 - 360 Million Years Ago
    The Devonian period was a time when the first amphibians, the first sharks, the first plants with roots, leaves appear. The Devonian is also known for its diversity of fish. Not only did fish with cartilage first appear, but fish with bony skeletons developed.
  • Carboniferous Period 360 - 278 Million Years Ago

    Carboniferous Period 360 - 278 Million Years Ago
    The Carboniferous Period lasted from about 359.2 to 299 million years ago* during the late Paleozoic Era. Its known because the plants covered the Earth.
  • First Fungi Appear - 300 Million Years Ago

    First Fungi Appear - 300 Million Years Ago
    By 300 million years ago, all forms of fungi existed, but earlier records are a bit sketchy. Nevertheless, there are some undisputed fossils of fungi from around 400-440 million years ago. Also, many of the earliest plant fossils show the presence of mycorrhizae.
  • Permian Period 283 - 247 Million Years Ago

    Permian Period  283  - 247 Million Years Ago
    The Permian Period is the final period of the Paleozoic Era. I The greatest mass extinction that has ever occurred on earth took place at the end of this 42-million-year period. During this period rocks were first found.
  • Triassic Period 247 - 203 Million Years Ago

    Triassic Period  247 - 203 Million Years Ago
    The Triassic Period is when the first Reptiles inherit the Earth, it was a time of growing new species to repopulate the planet. This time was the beginning of a new era, the Mesozoic Era.
  • First Dinosaurs Appear On Earth -230 Million Years Ago

    First Dinosaurs Appear On Earth -230 Million Years Ago
    The oldest dinosaur types are known from rocks in Argentina and Brazil and are about 230 million years old. The most primitive of these types, Eoraptor, was a small meat-eating dinosaur. Because Eoraptor's skeleton shows some advanced skeletal features, older dinosaurs may yet be found.
  • Jurassic Period 203 - 144 Million Years Ago

    Jurassic Period 203 - 144 Million Years Ago
    The Jurassic Period began as a large extinction took place at the end of the Triassic period. At the beginning, the continent, Pangaea, began to separate for the first time. This may have given cause to the mass extinction. This period was all about Dinosaurs domination.
  • First Mammals On Earth - 200 Million Years Ago

    First Mammals On Earth - 200 Million Years Ago
    00 million years ago, was the appearance of the first mammals. Mammals are vertebrates. They have a backbone, which encloses a sheath of nerves that leads in turn to a brain in a box or skull. They also have four limbs and special pentadactyl ends to these limbs. The first mammals evolved from a class of reptiles that evolved mammalian traits, such as a segmented jaw and a series of bones that make up the inner ear.
  • First Flowering Plants On Earth - 165 Million Years Ago

    First Flowering Plants On Earth - 165 Million Years Ago
    The first flowering plant appeared 140 million years ago from now.
    The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies (derived characteristics).
  • Cretaceous Period 144 - 67 Million Years Ago

    Cretaceous Period 144 - 67 Million Years Ago
    The Cretaceous period may have seen more dinosaurs then ever before. Birds became increasingly numerous & flowering plants were emerging. By the end of the Cretaceous period, all large and small ruling reptiles, except the crocodile went extinct.
  • Tertiary Period 67 - 2 Million Years Ago

    Tertiary Period 67 - 2 Million Years Ago
    The Tertiary Period marks the beginning of the Cenozoic Era. It began 65 million years ago and lasted more than 63 million years, until 1.8 million years ago. The Tertiary is made up of 5 epochs : The Paleocene Epoch - 65 to 54 million years ago
    The Eocene Epoch - 54 to 38 million years ago
    The Oligocene Epoch - 38 to 24 million years ago
    The Miocene Epoch - 24 to 5 million years ago
    The Pliocene Epoch- 5 to 1.8 million years ago
  • Five Mass Extincions - 65 Million Years Ago

    Five Mass Extincions - 65 Million Years Ago
    Mass extinctions are periods in Earth's history when abnormally large numbers of species die out simultaneously or within a limited time frame. The most severe occurred at the end of the Permian period when 96% of all species perished. This along with K-T are two of the Big Five mass extinctions, each of which wiped out at least half of all species. Many smaller scale mass extinctions have occurred, indeed the disappearance of many animals and plants at the hands of man in prehistoric, historic
  • First Humans Appear - 2 Million Years Ago

    First Humans Appear - 2 Million Years Ago
    Genus homo appeared about 2 million years ago. anatomically and behaviourally modern humans appeared about 30-70,000 years ago, depending on where on earth you're looking and what types of artefacts are considered to indicate behavioural modernity.
  • Quaternary Period 1 Million Years Ago Untill Today

    Quaternary Period 1 Million Years Ago Untill Today
    The Quaternary is the most recent geological period of time in Earth’s history, spanning the last two million years and extending up to the present day. The Quaternary period is subdivided into the Pleistocene (“Ice Age”) and the Holocene (present warm interval) epochs, with the Pleistocene spanning most of the Quaternary and the Holocene covering the past 10 000 years. The Quaternary period is characterized by a series of large-scale environmental changes that have profoundly affected and shap
  • Period: to

    Evolution of Earth