A Fossilized Bone Is Still a Bone

Dinosaur fossils are genuine fossil bones, but fossilization often changes their composition and structure. Groundwater can fill bone pores with minerals (permineralization), replace some original minerals, or cause recrystallization. The changes vary from specimen to specimen, and some original bone components can remain. So “dinosaur bones” is a valid phrase; they are simply not necessarily unchanged bones like those of a living animal.