The Goosenecks are a good example of downcutting - a meandering stream was flowing across a flat plain with little gradient, and then the region was uplifted and the meanders remained in place as the river cut down into the rocks beneath it due to its vastly increased erosional power due to the increased gradient.
And since the Goosenecks are in the same region as the slot canyons, it decimates the claim of this post that the canyons in the region were formed by a global flood.