Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Tertiary 65 MYRBP Quaternary 1.8 MYRBP

Not until 20,000 years ago do large permanent human settlements appear, and this is associated with the rise of agriculture. Bigger social groups produced more complex interactions, encouraging the development of language. By 10,000 years ago the first cities have appeared, and from these emerged our modern world.

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