Okay. So there is this chest in Gale Canyon that sits up on a ledge i can't get on, this ledge is above and to the right of a breakable boulder that blocks a narrow passage to a dead end with at least (don't remember how many at the moment) one chest in it. This ledge is also just below and to the left of a higher ledge which you can run around and onto. Now I've gone through the game and completed nearly all sidequests, gotten all characters, and have gained access to Demiurge Tower. I've tried nearly everything to get this one chest and have failed. Can someone help?

Use Sharon to shoot it down. Get some distance and use Sharons action.