Isaac's Timescale of time

By IEngels
  • Cambrian
    570 BCE

    Cambrian

  • Ordovician
    488 BCE

    Ordovician

    a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.2 million years from the end of the Cambrian Period 485.4 (mya)
  • Silurian
    443 BCE

    Silurian

  • Devonian
    419 BCE

    Devonian

    The first significant adaptive radiation of life on dry land occurred during the Devonian
  • 359 BCE

    Carboniferous

  • 299 BCE

    Permian