Potassium Argon is not much better:
“Scientists got dates of 164 million and 3 billion years for two Hawaiian lava flows. But these lava flows happened only about 200 years ago in 1800 and 1801.
(”Dry bones and other fossils” by Dr. Gary Parker)
One thing at a time. Who told you that carbon dating has shown that the same animal is several MILLIONS of years difference between different parts of it’s body?