1. Archaean period
   Read and learn about Archaean period...
   http: //academickids.com/encyclopedia/index.php/Arc...
   
   
2. Cambrian period
   Read and learn about Cambrian period...
   http: //academickids.com/encyclopedia/index.php/Cam...
   
   
3. Carboniferous
   Read and learn about Carboniferous Period..
   http: //academickids.com/encyclopedia/index.php/Car...
   
   
4. Cretaceous
   Read and learn about Cretaceous Period..
   http: //academickids.com/encyclopedia/index.php/Cre...
   
   
5. Devonian period
   Read and learn about Devonian period...
   http: //academickids.com/encyclopedia/index.php/Dev...
   
   
6. Hadean period
   Read and learn about Hadean period...
   http: //academickids.com/encyclopedia/index.php/Had...
   
   
7. Jurassic
   Read and learn about Jurassic Period..
   http: //academickids.com/encyclopedia/index.php/Jur...
   
   

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