Fossils And The Geological Timescale
Different
fossils
were laid down at different points in 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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