GEO TIME SCALE REVIEW

CAMBRIAN PERIOD

• 544-448 million years ago.
• Water- trilobite, bacteria and algae.
• There was no life on land.
• Ended with extinction.

ORDOVICIAN PERIOd

• 448-443 million years ago.
• No life on land.
• Water- trilobite, algae, brachiopod and squid.

SILURIAN PERIOD

• 443-416 million years ago.
• Land- simple plants and bugs.
• Water- jawfish, brachiopod and jawless fish.
• Other- when land first came.

DEVONIAN PERIOD

• 416-360 million years ago.
• Land- plants, tree and frogs.
• Water- fish with jaws and trilobite.

CARBONIFEROUS PERIOD

• 360-300 million years ago.
• Land- tree and dragonflies.
• Water- brachiopod, trilobite.
• The name came from when cowl was formed.

PERMIAN PERIOD

• 299-251 million years ago.
• Land- cold blooded mammals, reptiles.
• Water- brachiopod, algae, fish.
• Killed over 90% of living things in water and some on land.

TRIASSIC PERIOD

• 251-200 million years ago.
• Land- dinosaurs, mammals.
• Water- sharks, brachiopod and trilobite.

JURASSIC PERIOD

• 206-144.5 million years ago.
• Land- reptiles, mammals, plants, birds and dinosaurs.
• Water- marine reptiles.
• Ended when asteroid hit Earth.
• Humid weather.

CRETACEOUS PERIOD

• 142-65 million years ago.
• Land- flowering flowers, plants and insects.
• Water- fish.
• Ends with two large extinctions.

PALEOGENE PERIOD

• 66-23 million years ago.
• Land- forests, rodents and reptiles.
• Water- fish.
• Reptiles go extinct.

NEOGENE PERIOD

• 23-2.6 million years ago.
• Land- dinosaurs.
• Water- trilobite and sharks.

QUATERNARY PERIOD

• 2.6- present.
• Land- tiger, elephants..
• Water- sharks, whales, dolphins, fish..
• Most recent ice age.

TODAY

• We are still in the quaternary period.

THE THREE ERAS

• Palezoic (old life)
• Mesozoic (middle life)
• Cenozoic (recent life)