Fossils And The Geological Timescale

• Precambrian (3.8 billion to 570 million years ago)
• Bacteria and blue-green algae
• Cambrian (570 to 500 million years ago)
• First invertebrates
• Ordovician (500 to 440 million years ago)
• Silurian (440 to 410 million years ago)
• First land plants
• First land invertebrates
• Devonian (410 to 365 million years ago)
• First ferns and seed plants
• First insects
• First amphibians
• Carboniferous (365 to 290 million years ago)
• First flying insects
• First reptiles
• Permian (290 to 245 million years ago)
• Extinction of trilobites
• Triassic (245 to 210 million years ago)
• First dinosaurs
• First mammals
• Jurassic (210 to 140 million years ago)
• First birds
• Cretaceous (140 to 65 million years ago)
• First flowering plants
• First primates
• Extinction of dinosaurs
• Extinction of ammonites
• Paleocene (65 to 55 million years ago)
• Diversification and spreading of mammals
• Eocene (55 to 38 million years ago)
• Oligocene (38 to 25 million years ago)
• First grass
• Miocene (25 to 5 million years ago)
• Pliocene (5 to 2 million years ago)
• First hominids

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