古生代时期(Paleozoic) ，开始于前寒武纪的生物爆发(大约5亿4200万年前)，到二叠纪末期的生物大灭绝(大约2亿5100万年前)，约有3亿年之久。在古生代早期，大部分现存的生物门开始出现，在那时海底生物移居陆地。地球上目前许多自然资源的供给，如煤、石油和石灰岩，都是在古生代时期形成的。
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相关连结
1. The National Atlas shows where you might find various sorts of Paleozoic rocks (for those living in North America)
2. University of California Berkeley has a good site about the Paleozoic.
3. Palaeos also has a very fine site about the Paleozoic, thanks to M. Alan Kazlev.
4. If you want to know more about the Cambrian Explosion of life, learn about the Burgess Shale fossils at this site by Andrew MacRae of the University of Calgary.
5. The International Commission on Stratigraphy has a good list of the ages making up the Paleozoic at this site.
