SS 8 PART 2

The measurement of the early history of the Earth.

• Evolution

• Geologic Time

• Adaptation

• Prehistory

The major division of Geologic Time that encompasses several million years.

• Epoch

• Era

• Period

• Eon

Unit of time measurement used to describe millions of years ago.

• Billion

• MYA (Millions of Years Ago)

• Century

• Decade

The first major division of geologic time, occurring from 541 to 252 million years ago.

• Mesozoic

• Paleozoic

• Cenozoic

• Cambrian

The second major division of geologic time, from 252 to 66 million years ago.

• Mesozoic

• Cenozoic

• Paleozoic

• Neogene

The third major division of geologic time, starting from 66 million years ago to the present.

• Paleozoic

• Mesozoic

• Cenozoic

• Cambrian

The period of the Paleozoic era that occurred from 541 to 485 million years ago, characterized by marine diversity.

• Ordovician

• Cambrian

• Devonian

• Silurian

Period from 485 to 443 million years ago, where life remained largely confined to the seas.

• Cambrian

• Ordovician

• Silurian

• Devonian

The period from 443 to 419 million years ago, where insects and plants first emerged.

• Cambrian

• Silurian

• Devonian

• Carboniferous

Period from 419 to 358 million years ago, characterized by the greatest diversity of fish life and the emergence of amphibians.

• Ordovician

• Silurian

• Devonian

• Carboniferous