古生代時期(Paleozoic) ，開始於前寒武紀 的生物爆發(大約5億4200萬年前)，到二疊紀末期的生物大滅絕(大約2億5100萬年前)，約有3億年之久。在古生代早期，大部分現存的生物門開始出現，在那時海底生物移居陸地。地球上目前許多自然資源的供給，如煤、石油和石灰岩，都是在古生代時期形成的。
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相關連結
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.
4. The International Commission on Stratigraphy has a good list of the ages making up the Paleozoic at this site.
This work by Eric & Chun-Chih Hadley-Ives is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.