Millions, actually.
I'm aware of only one claim of flexible tissue being preserved in a dino fossil, and no claim at all of any cells or DNA being found.
Fossilization varies in its ability to preserve. Amber is good, but there may be other instances where tissue has been preserved. It's pretty rare.
I was referring to skin imprints, of which there are many examples. The original question, even if it is only bones preserved, is how could so many be preserved, especially sea life on mountain tops?
I'm done.