Which principle of relative dating can be used at siccar point in scotland to determine that the rocks below the unconformity were tilted to vertical before erosion occurred?

The principle of which relative dating can be used at Siccar Point in Scotland to determine that the rocks below the unconformity were tilted to vertical before erosion occurred is the original horizontality. Thank you for posting your question here. I hope the answer helps. 

C. naturally in the environment

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!