Human beings
(homo sapiens)
didn't appear until
very recently in
Earth's history.The Cretaceous period
was ruled by an amazing
variety of dinosaurs.The Jurassic period saw
the emergence of massive
plant-eating dinosaurs.The Triassic period, the
oldest, saw the appearance
of Earth’s first dinosaurs.The Mesozoic Era
This era is divided into
three time spans, or periods:
Age of the dinosaurs
Curiosity quiz
Look through the Age
of the dinosaurs pages
to identify each of the
picture clues below.
Albertosaurus
was a Cretaceous
dinosaur.Cretaceous: 144 to 65 million years ago Homo sapiens
Become
an expert
184-185 What is
a dinosaur?
208-209 What
happened?We know a lot about their size and appearance from fossil evidence.^183
T. re xGiganotosaurusVelociraptorGeological time is always shown
with the oldest period at the bottom
of the list. It reflects the sequence in
which rocks are laid down.