A Summary of the Million Dollar RATE Research Project (Radioisotopes and the Age of The Earth) Introduction: Rocks and fossils do not come with dates on them.
In fact, the very concept of strata representing long ages does not come from the rock strata themselves.
It assumes radioactive decay has never been interrupted by worldwide cataclysmic events.
Scientists do not disagree with the amount of daughter isotopes found in rock formations, but rather the constancy of the rate of decay.
That concept began with eighteenth-century French naturalist Georges Cuvier, picked up steam with Charles Lyell, and it has been in vogue ever since.