@65dBnoise yes, not so extreme diffs, but 3 billion+ years is a loooong time. Take that rock for example (assuming it's of volcanic origin if the color scale says anything): I can still imagine it having been transported long distances in large floods (rounded sides at the bottom) and having spent some Myrs under water with corresponding alteration. Its final location & aspect can be a combination of erosion and dislodgment.