Geologic History Notes

Pre-Cambrian Era

4.6Bya – 500 MYA – Hadeaon EON – Formation of ____________________ & ___________________

Archean EON – FIRST__________________.

o Single-Celled ________________________

Proterozoic EON – First multi-cellular _______________________ by the end.

Paleozoic Era

Cambrian

542-488 mya

Known as the Cambrian ________________!

*Trilobites

*Warming Anomalocaris:____________________________________

________________________________________________

________________________________________________

Adaptation: ______________________________________

________________________________________________

Ordovician488-444 mya

- Diversifications of _____________ ____________________

- Development of Coral _______________________.

- Evolution of ___________________ on to land.

- Ends with __________________________

Silurian444-416 mya

- Start of __________________________ life on dry land.

- First __________________plants

- Sea________________________

Devonian416-359 mya

- Age of ____________________!

- Placoderms, __________________________, ___________________,

and ______________________________.

- First true ___________________

- Ends in ____________________________

CarboniferousMississippian&Pennsylvanian

359-299mya

- Known as the age of ______________________.

- Known as the age of ______________________.

- Evolution of the ___________________________egg in reptiles

Permian299-252 mya

- Great diversity of ____________________ and

________________________.

- Therapsides were common (___________________________________)

- Greatest diversity of _________________________.

- The period ends with the largest mass extinction of the past __________

million years.

Mesozoic Era

Triassic Period252-200 mya

- Late Triassic – the origin and rise of the ____________________ and the

first land mammals.

- Icthyosaur – Giant marine ______________

- _________________event towards the end.

Jurassic Period200-146 mya

- The age of ________________________!

- Origin of ____________! Example: Pterosaurs –

Achaeopteryx

Cretaceous146-65.5 mya

- Huge _______________ deposits were created because of the

accumulatio of deadmaring algea.

- Sauropods, Iguanodon, triceraops, T-Rex, spinosaurus, and

________________

- Giant __________________ crater in Central America

- Mass Extinction

Cenozoic Tertiary65.5-2.6 mya

- _________________ flourished in the skies – They were the holdouts of

the dinosaur age.

- _________________ becomes the most successful plant on Earth

- Grazing ________________ emerge

- Dugongs – Related to the elephant

- _________________appears as the biggest shark of all.

- Two-footed Hominis split from chipmanzees

Quarternary2.6 to present mya

- Age of ______________!

- Whales and _____________ rules the seas

- Large mammals such as _________________, adapt to ice ages.

- _________________ are the result of the Earth’s wobbly orbit around

the sun.