Fossils And The Geological Timescale
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Fossils And The Geological Timescale
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''
Precambrian
'' (3.8 billion to 570 million years ago)
---
Bacteria
and blue-green
Algae
---First complex multicellular organisms and soft-bodied animals,
Charnia
''
Cambrian
'' (570 to 500 million years ago)
---First
Invertebrate
s
''
Ordovician
'' (500 to 440 million years ago)
''
Silurian
'' (440 to 410 million years ago)
---First land
Plant
s
---First land invertebrates
''
Devonian
'' (410 to 365 million years ago)
---First ferns and seed plants
---First
Insect
s
---First
Amphibians
---First
Ammonite
s
''
Carboniferous
'' (365 to 290 million years ago)
---First flying insects
---First
Reptile
s
''
Permian
'' (290 to 245 million years ago)
---Extinction of
Trilobite
s
''
Triassic
'' (245 to 210 million years ago)
---First
Dinosaur
s
---First
Mammal
s
''
Jurassic
'' (210 to 140 million years ago)
---First
Bird
s
''
Cretaceous
'' (140 to 65 million years ago)
---First
Flowering Plant
s
---First
Primate
s
---Extinction of dinosaurs
---Extinction of
Ammonite
s
''
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
Hominid
s