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Evolution timeline
c. 4 billion years ago
The earth's surface settles into a heaving turmoil of rock and water
c. 3.5 billion years ago
Fossilized bacteria have been found in rock 3.5 billion years old in Africa
c. 3 billion years ago
Single-celled water creatures, such as algae, begin the 2-billion-year process of evolving into slightly more complex forms of life
c. 1 billion years ago
Sponges and jellyfish drift in the sea, to be joined later by more purposeful shrimps and lobsters
c. 500 million years ago
The earliest known creature with a skeleton evolves as a form of fish
c. 400 million years ago
Plants, previously living only in the seas and rivers, begin to establish themselves on land
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