I'm afraid it's unrealistic to expect that every living organism will remain as an intact fossil. This is an argument right out of the fundamentalist ministries and it's merely an attempt to deny science, deny an ancient planet and deny biological evolution.Nope, we should litterally be walking on the bones of the millions of years worth of transitional mutants for every species on earth, if evolution produced them. Where are they? How long do you think it takes to turn a cow to turn into a Great Dane?
Bovine remain Bovine. Canine remain canine. Monkeys are still monkeys.
So, why has evolution stopped? Why are there no more transitions once modern man showed up? Are we still evolving into a different species now? Why not?
How do you explain the existence of fossil remains that are mush older than 6,000 years? Are you going to suggest that Noah walked dinosaurs which existed on the planet millions of years onto an Ark?