let's say that i'm using radiometric dating to get a time of formation for a rock. radiometric dating can give uncertainties, meaning that the date on a rock is not always precise. in this hypothetical situation, my rock turns out to be 255 million years old /- 20 million years (the /- means that it is possible that the rock was formed 20 million years later or earlier). what possible time periods could the rock have formed in?