Devil's Tower is likely an igneous intrusion, formed underground from molten rock that pushed up into sedimentary rock and became solid ~50 million years ago.

But what if it was a stump from an ancient giant tree? https://image.nostr.build/7cfe90c5dd5ca8748da869a651a9996e4bb8d18e541bc535658ea3b551d3d9a8.jpg