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Page 177


Evolutionary Geological Column
Era
Period
Biological Features
(First appearances of:)
Time
(In years ago:)
Age of:
CENOZOIC
Quaternary

Tertiary

Diversification of mammals and birds, man

70 million to the present

Mammals

MESOZOIC
Cretaceous

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

Silurian

Small land plants

440 to 410 million

Ordovian

Fish, clams, corals

500 to 440 million

Invertebrates, Seaweeds

Cambrian

Trilobites, mollusks, seaweed

600 to 500 million

PRE-CAMBRIAN
Algae, sponges, jellyfish, worms

Before 600 million

Algae


177
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