Well, here’s the periods!

Cambrian Period

543-490 mya

Cambrian explosion!

Ordovician Period490-443 mya

Extinction (60% of invertabrates extinct due to climate change)

Beginning and middle end

Marine invertebrates trilobites & brachiopods

Silurian Period

443-417 mya

Ancestors of spiders and centipedes

Stable climateGlaciers meltedOcean levels went up

Vascular plants

Coral reef

Devonian Period417-354 mya

Tetrapods! Seed plants like gymnosperms

North=drySouth =cool, temperate, ocean-covered

Age of fishes! Increase of terrestrial animals

Carboniferous Period

354-290 mya

Large plants and trees

Forest swamps covered land!

amphibians

Reptiles - Amniotic egg was covered with a leathery/hard shell

Permian

290-248 myaamphibians

prevalent More prevalent

MASS EXTINCTION DRY!Great seasonal fluctuations

Pangaea formed & it was

Gymnosperms replaced ferns

triassic

248-206 mya

Gymnosperms still dominant plant

TRUE MAMMALS

LOTS OF REPTILES!

jurassic

Gymnosperm still plentiful

Early bird-like creatures/archaeopteryxReptiles continued to be dominant including dinos

206-144 mya

cretaceous

3rd MASS EXTINCTION

144-65 mya

tertiary 65-1.8 mya

Mammals diversify

Angiosperm =dominant land plant

quaternary

1.8 mya - now

Hominids become more like humans