The muscle and blood found in a salamander fossil are the latest soft-tissue evidence in a long line of similar discoveries. Earlier, these flexible branching structures in T. rex bone have justifiably been identified as blood vessels, while microscopic structures squeezed out of the blood vessels look distinctly like cells, as evolutionary researchers themselves have admitted. Soft-tissue evidence such as muscle, blood and cells should not be there if the fossils really are millions of years old.
http://creation.com/muscle-and-blood-in-fossil