PERIOD Flashcards
In the Phanerozoic Eon it is divided into 3 era “Paleozoic Era
Mesozoic Era
Cenozoic Era”
“The term ‘Paleozoic’ has been derived from Greek words: palaios meaning ‘ancient’ and zoe meaning ‘life’
Marks the beginning of life on our planet.
It was the period of early life where plants, corals, mollusks, insects, fish, and many other living organisms emerged.” Paleozoic Era
The time period of this era is 542 - 252 MA Paleozoic Era
The atmosphere of this era is Nitrogen
oxygen
The geology of this era is Formation of continents Formation of mountain chains
formation of coal beds. Earth’s surface experienced a lot of activity
The climate of this era is There are extreme shifts in climate in each era Paleozoic Era
The life forms of this era are Invertebrates (animals without backbones) such as corals
brachiopods
“60% of invertebrates in the oceans and seas became extinct.
May be triggered by volcanic eruptions (Paleozoic era)” Late Ordovician Mass Extinction
“Permian-Triassic Mass Extinction
most severe extinction in our planet’s history
(Paleozoic era)” THE GREAT DYING EVENT
This eon is 253 to 66 million years ago Mesozoic Eon
The geology of this eon is Separation of the supercontinent Pangaea Mesozoic Eon
“The climate is warm throughout the triassic and jurassic period but towards the middle of the cretaceous period the climate became warmer.
Then global cooling occurred at the end of the Mesozoic” Mesozoic Eon
The life forms of this eon is Appearance of dinosaurs
birds
“At the end of the Mesozoic, the Cretaceous-Tertiary Mass Extinction occurred.
This was the extinction event that killed the dinosaurs (among others).
(Notable event of Mesozoic era)” The K-Pg Event
The time period is 67 million years ago to present Cenozoic era
