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Geologic Time

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Total cards: 24•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

L - G ordering

Back (Answer)

Epochs - Periods - Eras - Eons

#2
Front (Question)

Eons in order

Back (Answer)

Hadean, Archean, Proterozoic, Phanerozoic

#3
Front (Question)

Hadean Eon

Back (Answer)

Formation of Earth

#4
Front (Question)

Archean

Back (Answer)

First single-celled organisms + stromatolites

#5
Front (Question)

Proterozoic

Back (Answer)

Oxygen abundance from cyanobacteria + first multicellular organisms

#6
Front (Question)

Eras in the Phanerozoic Eon

Back (Answer)

Paleozoic, Mesozoic, Cenozoic

#7
Front (Question)

Periods in the Paleozoic Era

Back (Answer)

Cambrian, Ordovician, Silurian, Devonian, carboniferous, Permian

#8
Front (Question)

Periods in the Mesozoic Era

Back (Answer)

Triassic, Jurassic, Cretaceous

#9
Front (Question)

Periods in the Cenozoic Era

Back (Answer)

Paleogene, Neogene, Quaternary

#10
Front (Question)

Neogene epochs

Back (Answer)

miocene and pliocene

#11
Front (Question)

Quaternary epochs

Back (Answer)

Holocene and pleistocene

#12
Front (Question)

Cambrian Period

Back (Answer)

mass diversification of life (Cambrian Explosion); shelled organisms

#13
Front (Question)

Ordovician Period

Back (Answer)

Marine invertebrates; first jawless fish

#14
Front (Question)

Silurian Period

Back (Answer)

First land plants

#15
Front (Question)

Devonian Period

Back (Answer)

Insects and amphibians venture on land; age of fish

#16
Front (Question)

carboniferous Period

Back (Answer)

massive coal plants and swamps (Pennsylvanian and Mississippian)

#17
Front (Question)

Permian Period

Back (Answer)

extinction event + pangea forms

#18
Front (Question)

Triassic Period

Back (Answer)

Dinasaurs appear with some rodent-like mammals

#19
Front (Question)

Jurassic Period

Back (Answer)

Dinosaurs + birds

#20
Front (Question)

Cretaceous Period

Back (Answer)

Extinction of dinosaurs (highest dinosaur pop.) except for birds + first flowering plants

#21
Front (Question)

Paleogene Period

Back (Answer)

Mammals evolve

#22
Front (Question)

Neogene Period (describe each epoch)

Back (Answer)

miocene (mtn. ranges + warming climate) and pliocene (global cooling + hominids)

#23
Front (Question)

Quaternary Period (describe each epoch)

Back (Answer)

Pleistocene (Ice ages, large mammal extinction) Holocene (Interglacial)

#24
Front (Question)

Paleogene Epochs

Back (Answer)

Paleocene- primitve mammals eocene-lush rainforests and torpical oligocene - cooling and drying modern mammals emerging