First Children Encyclopedia

(Marvins-Underground-K-12) #1
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 x

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.
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