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Geological Time Scale
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34
Geology
Not Applicable
10/24/2014
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Term
Eon: present to 542 million years ago?
 Definition
phanerozoic
Term
Eon: 542 to 2500 million years ago?
 Definition
proterozoic
Term
eon: 2500 to 4000 million years ago?
 Definition
archean
Term
era: 0-65 million years ago?
 Definition
cenozoic
Term
era: 65-250 million years ago?
 Definition
mesozoic
Term
era: 250-542 million?
 Definition
paleozoic
Term
era: 542 million years to 1000?
 Definition
neo-proterozoic
Term
era: 1000-1600 million years ago?
 Definition
meso-proterozoic
Term
era: 1600-2500 million years
 Definition
paleo-proterozoic
Term
era: 2500-2800 million?
 Definition
neoarchean
Term
era: 2800-3200 million?
 Definition
mesoarchean
Term
era: 3200-3600 million years?
 Definition
paleoarchean
Term
era: 3600-4000?
 Definition
eoarchean
Term
period: 0-2.6
 Definition
quatemary
Term
period: 2.6 to 23?
 Definition
neogene
Term
period: 23-65
 Definition
paleogene
Term
period: 65-145
 Definition
cretaceous
Term
period: 145-200
 Definition
jurassic
Term
period: 250-300
 Definition
permian
Term
period: 300-360
 Definition
carboniferous
Term
period: 360-416
 Definition
devonian
Term
period: 416-443
 Definition
silurian
Term
period: 443-488
 Definition
ordovician
Term
period: 488-542
 Definition
cambrian
Term
period: 542-635
 Definition
ediacaran
Term
epochs: 0-0.0117
 Definition
holocene
Term
epoch 0.0117-2.6
 Definition
piestocene
Term
epoch 2.6 to 5.3
 Definition
pilocene
Term
epoch 5.3 to 23
 Definition
miocene
Term
epoch 23-34
 Definition
oligocene
Term
epoch 34-56
 Definition
ecocene
Term
epoch 56-65
 Definition
paleocene
Term
period 200-250
 Definition
triassic
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