Radiometric age dating
When granite rock hardens, it freezes radioactive elements in place.
The most common radioactive element in granite is Uranium-238.
As one moves to higher and higher layers, this concentration increases, but at a decreasing rate.However, before accepting any radiocarbon date, one should know how the technique works, its limitations, and its assumptions.One limitation is that the radiocarbon technique dates only material that was once part of an animal or plant, such as bones, flesh, or wood. To understand the other capabilities and limitations of radiocarbon dating, we must understand how it works and consider the flood. However, roughly one in a trillion carbon atoms weighs 14 atomic units. It is also called radio carbon because it is radio active (but not dangerous).The key questions then are: Has the atmospheric ratio of carbon-14 to carbon-12 changed in the past, and if so, why and how much?The assumption usually made, but rarely acknowledged, is that the ratio of carbon-14 to carbon-12 in the atmosphere before the industrial revolution has always been the sameabout one in a trillion.
Afterward, less carbon would be available to enter the atmosphere from decaying vegetation.