Eons

• Ga (Giga-annum): Represents a billion years.
• Ma (Mega-annum): Represents a million years.
• Ka (Kilo-annum): Represents a thousand years.
• Hadean

  • Hades, Greek word for hell
  • Earth's initial formation
  • Zircon
• Archean

  • life first formed
  • Prokaryotic Microbes
  • Ocean and continents, ozone layer, banded iron formation
  • Cyanobacteria
• Proterozoic

  • Under: Paleoproterozoic, Mesoproterozoic, Neoproterozoic
  • Snowball Earth, Rodinia, Oxygenation
  • Cratons
  • Stromatolites
• Precambrian

  • earliest part of history
  • under: Hadean, Archean, Proterozoic
• Phanerozoic

  • current eon
  • under: Paleozoic, Mesozoic, Cenozoic
• Paleozoic

  • Cambrian Period
  • Ordovician Period
  • Silurian Period
  • Devonian Period
  • Carboniferous Period
  • Permian Period
• Mesozoic

  • Triassic Period
  • Jurassic Period
  • Cretaceous Period
• Cenozoic

  • Paleogene
  • Neogene
  • Quaternary
• Paleogene

  • Paleocene Epoch
  • Eocene Epoch
  • Oligocene Epoch
• Neogene Period:

  • Miocene Epoch
  • Pliocene Epoch
• Quaternary Period:

  • Pleistocene Epoch
  • Holocene Epoch
• Five Mass Extinction

  • Ordovician
  • Late Devonian
  • End Permian
  • End Triassic
  • End Cretaceous
• End Ordovician

  • Resulted in the extinction of up to 85% of all living species. Suspected cause is continental drift and subsequent climate change.
• Late Devonian

  • Many tropical marine species went extinct during this even
• End Permian

  • Known as the largest mass extinction event in Earth’s history, it affected a range of species, including many vertebrates.
• End Triassic

  • This event is often mistaken as the one that killed off the dinosaurs.
• End Cretaceous

  • This is the event that led to the extinction of the dinosaurs
• Holocene

  • extinction due to human activities