history of the world by Pvt Scott

By Pvt Scott
  • 570 BCE

    cambrain

    cambrain
    Though there is some scientific debate about what fossil strata should mark the beginning of the period, the International Geological Congress places the lower boundary of the period at 543 million years ago with the first appearance in the fossil record of worms that made horizontal burrows. The end of the Cambrian Period is marked by evidence in the fossil record of a mass extinction event about 490 million years ago. The Cambrian Period was followed by the Ordovician Period.
  • 443 BCE

    Silurian Period

    Silurian Period
    The Silurian Period occurred from 443 million to 416 million years ago. It was the third period in the Paleozoic Era. It followed the Ordovician Period and preceded the Devonian Period. During this time, continental landmasses were low and sea levels were rising
  • 358 BCE

    carboniferous period

    carboniferous period
    Arthropods were also very common, and many (such as Meganeura) were much larger than those of today. stratigraphy evident today. The atmospheric content of oxygen also reached their highest levels in geological history during the period, 35%compared with 21% today, allowing terrestrial invertebrates to evolve to great size.A major marine and terrestrial extinction event occurred in the middle of the period, caused by climate change.
  • 299 BCE

    permian period

    permian period
    Geologic time scale : Paleozoic Era
    The Permian Period The Permian period lasted from 299 to 251 million years ago* and was the last period of the Paleozoic Era. The distinction between the Paleozoic and the Mesozoic is made at the end of the Permian in recognition of the largest mass extinction recorded in the history of life on Earth. On land, a relatively smaller extinction of diapsids and synapsids cleared the way for other forms to dominate.
  • 65 BCE

    tertiary period

    tertiary period
    Tertiary The first period of the Cenozoic Era, which began 65 Ma ago and lasted approximately 63.2 Ma. The Tertiary followed the Cretaceous and comprises 5 epochs: Palaeocene; Eocene; Oligocene; Miocene; and Pliocene. Angiosperms superseded the gymnosperms as the dominant plants.