Perhaps there was less C14 produced in the past, which would imply that even the relatively young C14 dates are too old. The C14/C12 ratio of living things and organic matter on the surface of the earth is about the same as in the atmosphere because carbon is constantly exchanged between living things and the atmosphere.
After an organism dies, if it is buried and left undisturbed, the C14 in it gradually decays into nitrogen 14. Thus the ratio of C 14 to C12 in the remains of the organism gradually decreases with time.
Here are some specific results along this line; many more could be cited.
This means that the amino acid can have two different configurations, “D” or “L” which are mirror images of each other.
Robert Service wrote in Science: The [soft tissue fossil] claims were met with howls of skepticism from biochemists and paleontologists who saw no way that fragile organic molecules could survive for tens of millions of years, and wondered whether her samples were contaminated with modern proteins.
Ancient protein specialist Michael Collins noted, “Proteins decay in an orderly fashion. This shows that there are many such finds of protein in fossil specimens, and also that experts in the field have trouble seeing how proteins could survive in bone for millions of years.
Even more, proteins in this tissue retain their structure.
Extraordinary efforts were made to eliminate all contamination from the measuring apparatus.