Earth has an incredibly long history, as
it formed about 4,600 million years ago.
Geologists divided the passage of
time since then into huge
chunks called eras.
The dinosaurs
lived in the
Mesozoic Era.
Age of the dinosaurs
A question of time
Different dinosaurs lived at different
times, and many of the best-known
dinosaurs never actually met. For
example, no
T. rex
ever tried to kill a
Stegosaurus
because their existence was
separated by about 80 million years.
Age of the dinosaurs
Triassic: 248 to 206 million years ago Jurassic: 206 to 144 million years ago
MESOZOIC ERA
182
How do we know what dinosaurs looked like?
Eoraptor
Plateosaurus
Coelophysis
Brachiosaurus
Stegosaurus
