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Geological Time Scale

Geological periods

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Periode - EpochBeginning - End
(106 years)
Cenozoic era
Quaternary Holocene 0 - 0.0115
Pleistocene 0.0115 - 1.81 Homo erectus - the evolution of anatomically modern humans
Tertiary Pliocene 1.81 - 5.3 The first recognizable hominins, the australopithecines, appeared
Mioscene 5.3 - 23 Origin of grass
Oligoscene 23 - 34 Rise of cats, dogs, pigs
Eoscene 34 - 56 Hoofed animals
Paleoscene 56 - 65 Primates
Mesozoic era Cretaceous 645 - 145 Demise of dinosaurs
Jurassic 145 - 200 First birds
Triassic 200 - 251 Many major groups of dinosaurs emerged
Paleozoic era Permian 251 - 299 Flowers, insect polination
Carboniferous 299 - 359 First conifers
Devonian 359 - 416 First vertebrates ashore
Silurian 416 - 444 Spore-bearing plants
Ordovician 444 - 488 Vertebrates appear
Cambrian 488 - 542 Most animal life aquatic
Pre-Cambrian Pre-cambrian III (Proterozoic) 542 - 2500  The first advanced single-celled, eukaryotes and multi-cellular life, first plant, jellyfish
Pre-Cambrian II (Archean) 2500 - 3850 Photosyntetic bacteria
Pre-Cambrian I (Hadean) 3850 - 4600 Earth formed 4600 million years ago
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Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

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