Geologic Timeline of the Rockies

  • Paleozoic Era

    Tectonic uplift creates the Ancient Rocky Mountains
  • Mesozoic Era

    Rocky Mountains erode and leave sediment at bottom of mountain range
  • Cenozoic Era

    Abnormal convergent plate boundaries pile crust on the Earth and leave the Rocky Mountains far inland from subduction zone boundary. Lava spews onto North America's coast