The Silurian is a geological period believed by secular paleontologists to be between 443 and 417 million years ago. The fossil record shows that water-based life forms during the Silurian period included coral reefs, jawless fish, and freshwater fish. Land-based life included spiders and centipedes. Vascular plants first appear in the fossil record during the Silurian period. 
Young earth creation scientists view
Young earth creationist scientists state that there are numerous lines of evidence pointing to a young Earth and that the old Earth paradigm is errant and has many anomalies. (For details, see Geologic system and Young Earth Creationism.)
- Answer.com, Silurian 
- University of California Museum of Paleontology, The Silurian, 443 to 417 Million Years Ago 
- www.palaeos.com, The Silurian Period of the Paleozoic Era: 444 to 416 Mya 
- Examples of fossils from the Silurian period.