A block of sandstone, flat on all sides, is not shaped like a dune. Would think that pretty obvious myself.
And the blocks of wood in my workshop are not shaped like trees. Yet by looking at them, I can tell you what kind of tree they are from, what that tree was shaped like, which parts of the wood grew in "good" years and which in "bad", and on and on. Yet the blocks of wood are not shaped like trees. How can this be?
Could it be because I have taken the time to actually learn something about trees and the boards they are sometimes turned into? Could it be that those who study geology have similarly learned how to recognise the characteristics of dunes in the blocks of sandstone they sometimes become?
PS: If you have some big trees that you want to move from one place to another after you've killed them, the Hayes HDw in my avatar photo is one hell of a tool for accomplishing that task.