human
Make a concise location description of a foreboding scene outside a canyon with indentations and boulders.
assistant
Overhead, the edge of one of the high rock walls has crumbled, sending a large pile of boulders down into the pass. Contrasting round and jagged edges protrude from the conglomeration of rock, effectively barring the pass from further movement to the south. Strangely, a few shallow indentations have been cut into the rock, perhaps as an aid to those who might wish to climb them.