Question: whats the oldest fossil you have looked at

Duncan Murdock answered on 15 Mar 2010:

For my own research the oldest fossils I look at are from a time known as the Lower Cambrian, about 520 million years ago, which is more than twice as old as the oldest dinosaurs! But some of my colleagues work with even older fossils, that I’ve been able to see, which are the oldest animals ever found at more than 600 million years old.