Uneducated people often claim we have not observed evolution. In fact we have. We have observed small variations. Large variations require millions of years, so the way to observe evolution is to note the differences and progression of fossils in rocks of different ages. We can age many rocks by radio isotope measurements.
Too many assumptions when "dating" rocks. You have to assume there was no daughter product at the beginning. You have to assume there was no parent or daughter product leached out. You have to assume there has been no parent or daughter product contamination in the subject material for the millions of years prior to testing it.
I recently read about a rock picked up at the bottom of Grand Canyon. It was broken into different parts. Different dating methods by different laboratories came up with dates that varied over a billion years for the samples from the same rock.
