EARTH SCIENCE 11 - Geologic Time Scale | Quizlet

Geologic time scale

formal subdivision of Earth time and it was developed using both absolute and relative dating techniques

eons, eras, periods, and epochs

the geologic time scale is divided into..

Hadean eon

the beginning of Earth when it was like hot and molten like "hell" with the bombardment of asteroids and massive volcanic activity

Archean eon

this is the eon when Earth created the first oceans and continent and Life began with the oldest rocks and fossils

Proterozoic eon

the longest eon when the great oxygenation event and ice happened and there was new land and new life

Phanerozoic eon

Earth's current eon containing the paleozoic, mesozoic, and cenozoic era

Paleozoic era

the era that contains the cambrian, ordovician, silurian, devonian, carboniferous, and permian period

Cambrian period

period best known for the _________ explosion where marine-shelled invertebrates also happened

Ordovician period

the period when Earth was mostly water and marine life further diversed and the first vertebrates appeared before 85% were wiped out by the late _________ mass extinction

SIlurian period

1st vascular plants appeared on land and arthropods (the first early animals) and climate started to stabilize

Devonian period

age of fishes, animals transitioned from water to land, first amphibians and forests. the Late ___________ Mass Extinction happened due to lack of oxygen in the ocean

Carboniferous period

ferns were dominant, major events was carbon from the formation of coal and there were extensive forests

Permian period

reptiles dominated land, the supercontinent Pangaea was formed and then the Great Dying where 90-96% of marine species and 70% of terrestrial vertebrates went extinct

Mesozoic era

the era that contains the triassic, jurassic, and cretaceous when dinosaurs were dominant

Triassic period

life was recovering from the great dying and the 1st dinosaurs appeared along with mammals

Jurassic period

dinosaurs dominated the earth and the first early birds appeared

Cretaceous period

a giant asteroid hit causing the extinction of dinosaurs and the dominance of mammals

Cenozoic era

Earth's current era, containing the tertiary and quaternary period

Tertiary period

a period that contains the paleocene, eocene, oligocene, miocene, and pliocene epoch

Paleocene epoch

recovery from the giant asteroid and mammals rise

Eocene epoch

mammal diversification and more animals, major continental drift and Antarctica fully separated and was put into place

Oligocene epoch

"ice house" Earth with the appearance of mountain ranges and apes

Miocene epoch

ecosystems expanded, horses, deers, elephants, and camels are more common and human ancestors split from the apes

Pliocene epoch

Panama was formed, the evolution of humans, ecological change happened and then climate change became more modern and stable, marking the end of the tertiary period

Quarternary period

Earth's current period, containing the pleistocene and holocene epoch

Pleistocene epoch

Ice age, rise of man and mammals and glaciers

Holocene epoch

Earth's current epoch, the rise of homosapiens and they transitioned from hunting to farming