Question

Fossils are evidence for what time scale?

Answer 1

Fossils reveal what may have been living in the surrounding environment hundreds of years ago.

Answer 2

Well, fossils can really come from anytime. For example fossils can come from  animal's preserved bones from long ago they can also be imprints of something like a old leaf or animal with a shell such as a Trilobite.

I'm sorry if this doesn't help I didn't really understand your question.