dpe - earth's history

Earth's age

4.6 billion years old

We live in...

Phanerozoic Eon, Cenozoic Era, Quaternary Period, Holocene Epoch

What eons make up the Pre-Cambrian? (HAP)

Hadean, Archean, Proterozoic

significance of hadean eon

earth's crust can’t become solid due to collisions with planetesimals; "hell"

significance of archean eon

crust forms, first sign of life: cyanobacteria

significance of proterozoic eon

first supercontinent: "Rodinia"

how are periods determined

the starts/ends of the appearance/disappearance of species

COS periods

Cambrian, Ordovican, Silurian

significance of cambrian period and how did it end

boom of species; diverse animals with shells, teeth, skeletons, and sea animals. ended: mass extinction/ice age

significance of ordovican period and how did it end

warmer climate causing sea level to rise. ended: mass extinction/ice age

significance of silurian period

first animals and plants that were permanent

DCP periods

Devonian, Carboniferous, Permian

significance of devonian period

age of fish; ammonites

significance of carboniferous period

age of plants; high oxygen created large insects; "coal-bearing" due to dead forest

significance of permian period and how did it end

pangea. ended: huge mass extinction - 90-95% marine life, 70% land-living

TJC periods

Triassic, Jurassic, Cretaceous

significance of triassic period and how did it end

first mammals, dinosaurs exist. ended: mass extinction due to volcanic activity and meteorite in canada

significance of jurassic period

dinosaurs on top (dominated)

significance of cretaceous period and how did it end

first flowering plants. ended: meteorite in gulf

PNQ periods

Paleogen, Neogene, Quaternary

what was the paleogene and neogene formally known as

tertiary period

significance of paleogene and neogene periods

mammals on top, first primates, biomes began to develop

significance of quaternary period

has reoccurring ice ages, rapid changes in sea level, flora and fauna, homosapiens came into existence 200,000 yrs ago

significance of holocene epoch

end of last ice age, humans begin to adapt