Carbon dating supports evolution
Igneous incursions into sedimentary layers can be dated using Uranium decay. Again small changes in the amount of Uranium or the amount of Lead can lead to large differences in the estimated age of the igneous layers.Also the calculation are based on assumptions that the layer started with no lead and 100% uranium and no erosion has occurred.
This rate of decay is constant for a given isotope, and the time it takes for one-half of a particular isotope to decay is its radioactive half-life.
Geologist Ralph Harvey and historian Mott Greene explain the principles of radiometric dating and its application in determining the age of Earth.