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  Evolution timeline
     
c. 4 billion years ago
 
Narrative history in HistoryWorld    
The earth's surface settles into a heaving turmoil of rock and water      
c. 3.5 billion years ago
 
Narrative history in HistoryWorld    
Fossilized bacteria have been found in rock 3.5 billion years old in Africa      
c. 3 billion years ago
 
Narrative history in HistoryWorld    
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
 
Narrative history in HistoryWorld     
Sponges and jellyfish drift in the sea, to be joined later by more purposeful shrimps and lobsters       
c. 500 million years ago
 
Narrative history in HistoryWorld    
The earliest known creature with a skeleton evolves as a form of fish      
c. 400 million years ago
 
Narrative history in HistoryWorld    
Plants, previously living only in the seas and rivers, begin to establish themselves on land