Science: Biology - Geologic Time Scale by Arthur Holmes 1913

Biology - Geologic Time Scale by Arthur Holmes 1913

  1. Cenozoic
    • Quarternary - human civilizations
    • Tertiary - age of mammals
  2. Mesozoic
    • Cretaceous - last of the dinosaurs
      • Jurrasic- dinosaurs abundant
      • Triassic - first mamals and dinousaurs
  3. Paleozoic
    • Permian - expansion of reptiles
      • Carboniferous - age of amphibians
      • Devonians - age of fishes
      • Silurian - few arthropods
      • Ordovician - first vertebrates
      • Cambriam - marine invertebrates
  4. Precambriam
    • primitive marine life

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