This method is used only on metamorphic and igneous rocks – not sedimentary rocks (which are rocks laid down by water – and is where the fossils are primarily found).The radio-dating calculations are based on a series of Assumptions: 1) The decay rate has not changed.
We do not know for sure if the rate of decay was the same 1000 years ago, let alone 10,000 years ago, or millions of years ago. Has there been contamination into the rock of either extra amounts of parent or daughter elements? 3) The starting point contains only the parent element.
In geology, the buzzword is “The present is the key to the past” – but today – no 100 mile cavern systems are being formed, vitually no fossils are being formed, and no new strata covering entire continents are being laid down. Unfortunately, uniformitarianism has gripped geology academia and no other viewpoints are allowed.