Evolution Over Time

By: Lena Martens


  • Earliest Fossil Bacteria
  • 2,750 Million Years Ago
  • Precambrian Era



  • Origin of O2 by Photosynthesis
  • 2,500 Million Years Ago
  • Precambrian Era



  • First Eukaryotes
  • 1,500 Million Years Ago
  • Precambrian Era



  • Early Eukaryotes
  • 1,500 Million Years Ago
  • Precambrian Era




  • Diverse Protists
  • 1,000 Million Years Ago
  • Precambrian Era



  • Earliest Multicellular Organism
  • 700 Million Years Ago
  • Precambrian Era



  • Origin of Major Animal Phyla
  • 520 Million Years Ago
  • Cambrian Period


  • Origin of All Major Animal Phyla
  • 510 Million Years Ago
  • Cambrian Period


  • Animal Diversity Abounds ; First Jawless Fish
  • 500 Million Years Ago
  • Ordovician Period



  • First Mass Extinction
  • 440 Million Years Ago
  • Ordovician Period


  • Plants and Arthropods Invade Land ; Jawed Fish First Appear
  • 440 Million Years Ago
  • Ordovician Period



  • Bony Fish Became Abundant
  • 400 Million Years Ago
  • Devonian Period



  • Early Amphibians
  • 370 Million Years Ago
  • Devonian Period



  • Second Mass Extinction
  • 360 Million Years Ago
  • Devonian Period



  • Early Reptiles
  • 350 Million Years Ago
  • Carboniferous Period



  • Third Mass Extinction
  • 250 Million Years Ago
  • Carboniferous Period



  • The First Dinosaurs and Mammals
  • 240 Million Years Ago
  • Triassic Period



  • Fourth Mass Extinction
  • 200 Million Years Ago
  • Triassic Period



  • Dinosaurs
  • 180 Million Years Ago
  • Jurassic Period



  • Appearance of Flowering Plants
  • 120 Million Years Ago
  • Cretaceous Period


  • Fifth Mass Extinction
  • 65 Million Years Ago
  • Cretaceous Period


  • Birds and Mammals Spread
  • 60 Million Years Ago
  • Tertiary Period


  • Major Mammal Groups Evolve
  • 40 Million Years Ago
  • Tertiary Period



  • Mammals Abundant on Land
  • 20 Million Years Ago
  • Tertiary Period


  • Appearance of Australopithecus
  • 5 Million Years Ago
  • Tertiary Period



  • First Homo Sapiens
  • .5 Million Years Ago
  • Quaternary Period