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Evolutionary Geological Column
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Era
|
Period
|
Biological Features
(First appearances of:)
|
Time
(In years ago:)
|
Age of:
|
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CENOZOIC
|
Quaternary
Tertiary
|
Diversification of mammals and birds, man
|
70 million to the present
|
Mammals
|
|
MESOZOIC
|
Cretaceous
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Larger mammals, insecteating animals, multiplication of deciduous trees and grasses
|
135 to 70 million
|
Reptiles, Flowering Plants
|
|
Jurassic
|
Flying reptiles, birds, coniferous trees, small mammals
|
180 to 135 million
|
|
Triassic
|
Marine reptiles, dinosaurs, small mammals, flowering plants
|
225 to 180 million
|
|
PALEOZOIC
|
Permian
|
Reptiles and large insects
|
270 to 225 million
|
Amphibians, Seed Plants
|
|
Carboniferous
|
Insects, spiders, snails, large amphibians, seed plants
|
350 to 270 million
|
|
Devonian
|
Amphibians, sharks, small trees
|
410 to 350 million
|
Fishes, Land plants
|
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Silurian
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Small land plants
|
440 to 410 million
|
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Ordovian
|
Fish, clams, corals
|
500 to 440 million
|
Invertebrates, Seaweeds
|
|
Cambrian
|
Trilobites, mollusks, seaweed
|
600 to 500 million
|
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PRE-CAMBRIAN
|
Algae, sponges, jellyfish, worms
|
Before 600 million
|
Algae
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