I can't comment on the 6,000 year thing, but I believe dinosaurs were described in the Bible - and not as fossils but as living breathing creatures that the reader understood.
Just look up behemoth and leviathon. No matter what your Bible concordance may say, they were not an elephant or an aligator. ;)
And you know that how?
I don't know of anyone who believes in an old earth that also believes dinos survived into the Biblical era.