I didn't know if it would be significant to cause an effect, and because they calculate a confidence interval for radiometric dating. Einstein's Theory of General Relativity says that the closer you get to a source of gravitation, the slower time runs. A GPS satellite has to correct for General Relativity and Special Relativity by 38 microseconds/day (GPS time runs 38 microseconds faster on average than on the surface of the Earth and they have to set the GPS clock wrong to make up for it). I know that rocks at higher altitudes don't have so much of a difference in altitude, but I was curious if General Relativity affects radiometric dating?