References

These are all the adresses from where we took information or pictures in order to develop a very concise work:


1. http://www.palaeos.com/Paleozoic/Paleozoic.htm
2. http://www.palaeos.com/Paleozoic/Silurian/Silurian.htm
3. http://www.palaeos.com/Paleozoic/Devonian/Devonian.htm
4. http://www.bobainsworth.com/fossil/palaeozoic.htm
5. http://www.fossils-facts-and-finds.com/paleozoic_era.html
6. http://www.ucmp.berkeley.edu/paleozoic/paleozoicloc.html