Potassium 40 dating rocks
Due to the long half-life of Although it finds the most utility in geological applications, it plays an important role in archaeology.One archeological application has been in bracketing the age of archeological deposits at Olduvai Gorge by dating lava flows above and below the deposits.
Entrained argon—diffused argon that fails to escape from the magma—may again become trapped in crystals when magma cools to become solid rock again.
By this he means that argon gas in his rock has come from the melting of some older rocks deep underground and contaminated his sample with a higher concentration of argon-40, which is why its age is too old.
This is a standard explanation and is essentially a new story about the past, different from the original story that explained how potassium-argon dating works.
We could ask ourselves which of the details of this story have been observed.
It is a story about older rocks, melted rocks, solidified rocks and argon gas.