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?
183
We know a lot about their size and appearance from fossil evidence.
T. rex
Giganotosaurus
Velociraptor
Geological time is always shown
with the oldest period at the bottom
of the list. It reflects the sequence in
which rocks are laid down.
