AN ALLEN SCREW IN ANCIENT ROCK? 🔧🦖 Found in sedimentary shale layers. This isn't just a nail; it’s a socket head screw (designed for an Allen key). Shale forms from mud at the bottom of ancient oceans over millions of years. How can a modern standardized screw be trapped inside? Was there high-tech industry on Earth before the first mammals appeared? #ShaleScrew #AncientTech #OOPArt #ImpossibleArtifact #ChronoArchives ü