Geological Timescale

  • Earth is formed

    Earth is formed
  • Period: to


  • Atmosphere forms

    [stuff]( )
  • Oxygen becomes more prominent

  • Oceans form

  • Early Life Forms Start

    Early Life Forms Start
  • Supercontinent Rodinia

    Supercontinent Rodinia
    stuff The supercontinent Rodinia broke up, splintering into smaller continents.
  • Period: to


  • Life evolved and diversified

    Life evolved and diversified
    stuff Life evolved and diversified greatly, in an event called the Cambrian Explosion. Invertebrates and the first shelled animals evolved at this time.
  • Abundance of marine invertebrates

    Abundance of marine invertebrates
  • Pangaea begins to split apart

    Pangaea begins to split apart
    [stuff]( Towards the end of the Triassic, Pangaea began to split apart,with Africa slowly moving from the Americas.
  • Period: to


  • The first dinosaurs

    The first dinosaurs
    stuff The first dinosaurs and mammals evolved at this time.
  • New oceans appeared

    New oceans appeared
  • a Great variety in the kinds of dinosaurs

    a Great variety in the kinds of dinosaurs
  • Period: to


  • Christmas break ends

    Christmas break ends