Page 137 - Science Course 3 (Book 2)

Mo11-L5a: Major Events During the Paleozoic Era

The Paleozoic era lasted for more than half of the Earth’s climate was warm during
Phanerozoic eon. the Early Paleozoic, and rising
seas f ooded the continents and
The Paleozoic era is often divided into three parts: formed many shallow inland seas.
early, middle, and late.
An inland sea is a body of water
formed when ocean water f oods
continents.

Inland
Sea

The Silurian and Devonian periods make up the
Middle Paleozoic.

The Cambrian and Ordovician periods make up the
Early Paleozoic.

Cambrian Period Ordovician Period Silurian Period Devonian Period
542 – 488 mya 488 – 444 mya 444 – 416 mya 416 – 359 mya

The organisms from the Cambrian explosion were Middle Paleozoic
invertebrates that lived only in the oceans.
There were so many types of f shes during the
This time is often called the age of invertebrates. Silurian and Devonian periods that the Middle
Paleozoic is often called the age of f shes.
Locations of Earth’s continents have changed since
the Early Paleozoic. On land, cockroaches, dragonf ies, and other insects
evolved.
The landmass that would become North America
was on the equator.

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