Paleology scale

By Guido Grimaldi
  • 538 BCE

    Cabrian explosion

    also known as Cambrian radiation or Cambrian diversification
  • Period: 498 BCE to 405 BCE

    Great Ordovician Biodiversificaton Event

    *GOBE was arguably the most important and sustained increase of marine biodiversity in Earth’s history. The GOBE may have had Cambrian roots and can be viewed as a follow-up to the Cambrian explosion. They seem to be linked as part of a single large-scale evolutionary package of marine life. Ref: Thomas etal 2009_Understanding the Great Ordovician Biodiversification Event (GOBE): Influences of paleogeography, paleoclimate, or paleoecology, doi: 10.1130/GSATG37A.1
  • 485 BCE

    Cambrian–Ordovician extinction event

  • 445 BCE

    Ordovician–Silurian extinction events