Geologic Time Scale

Bio 2

Eons in order (APrPh)

Archean, Proterozoic, Phanerozoic

Eras in order (PMC)

Paleozoic, Mesozoic, Cenozoic

Paleozoic Periods in order

cambrian, ordovician, siberian, Devonian, carboniferous, permian

after what periods in the paloezoic era were there mass extinctions?

Ordovician, Devonian, permian

mesozoic periods in order (TJC)

Triassic, Jurassic, Cretaceous

cenozoic periods in order (PN)

Paleogene, Neogene

after what periods were there mass extinctions in the mesozoic era?

triassic and creatceous

describe current mass extinction

overall decrease in diversity and global warming all mostly due to human activity

Archean eon

origin of earth
oldest fossils of cells (prokaryotes)
Oxygen begins to increase
Atmosphere temps decrease

Proterozoic eon

Oldest fossils of eukaryotic cells
diverse algae and soft bodied invertebrates

cambrian period

beginning of Paleozoic era

“cambrian explosion”

increase in many animal phyla

ordovician period

colonized land with plants and arthropods
followed by a mass extinction of marine life due to climate change and glaciation.

siberian period

diversify vascular plants

Devonian period

"Age of Fishes"

dominance of fish and first amphibians.

need with mass extinction

carboniferous period

Extensive vascular plants

origin of reptiles

amphibian dominant

Permian Period

reptiles expanded
ended with mass extinction and Pangaea formation

describe permian mass extinction

“the great dying”
many marine and terrestrial organisms died due to drastic climate changes and volcanic activity

ended Paleozoic era

triassic period

start of mesozoic era

rise of dinos and first mammals

conifers (cone bearing plants) dominated landscape

Jurassic Period

dinos diversified
first birds appeared
gymnosperms dominate

cretaceous period

dinosaurs dominate

angiosperms (flowering plants) appear

end with mass extinction and end of mesozoic era

describe cretaceous extinction

aka K-T extinction

caused by an asteroid impact and volcanic activity

extinction of many species including dinosaurs

paleogene period

age of mammals begins

birds diversify

flowering plants continue to thrive.

neogene period

ice ages
humans appear

current mass extinction

overall decrease in diversity and global warming due to human activity