Assumptions behind radiometric dating
These three assumptions can never be proved about rocks in the past.
After all, who was there to continuously measure the rate to verify it stayed the same as today’s rate? And who has continuously monitored the process to confirm that it was not contaminated? No matter what dating method we choose, it is only as good as its assumptions.
To make matters worse, even if radioactive material is present, it must have produced sufficient by-products for accurate measurement.
But the human evolution and migrations are too recent to be useful, if you accept evolutionary assumptions. The argon-argon method, as it’s called, can date rocks associated with recent human remains.
Measuring the quantities of those elements enables us to estimate an age based on how far along the process has gone.
For this method to work with human artifacts or bones, however, they need to be entombed in limestone containing uranium, such as that in cave deposits.
One speaks of slow movement and gradual migrations over thousands of generations.
That does happen occasionally, such as the Homo naledi bones recently found in the Rising Star Cave, South Africa. Of course, radiocarbon can be used, and has been, to date human bones and artifacts if they still have organic carbon in them.
However, secularists assume radiocarbon essentially disappears after 50,000–60,000 years, so they don’t even look for it among ancestors they believe lived over hundreds of thousands of years ago.
The other, which starts with God’s historical record, says the Lord divided human languages at Babel—just over 4,000 years ago—and all human migrations and cultures have occurred since that time. The problem is not with the Bible or the data that scientists gather, but with their assumptions about the past.
How do we fit these few scattered artifacts and bones into a coherent history? Secular investigators start with the assumption that humans evolved from a common ancestor with the apes and then dispersed across the globe over millions of years.