Rocky Crevice, Just Above Hyalite Creek, Gallatin National Forest, MT. In the ZMM Passage above => Note many location clues as to where this route may have been. The Narrator says they reach a cliff and it is bad enough that they must move along it in search for a way down.
….Although the previous WayPts N+C (I have shown on my "N+C Hypothetical Climb Trail" Map), fit very well to the ZMM Narrative, the “route down … in a rocky crevice”, from the Cliff, to Hyalite Creek, offers many reasonable routes down to the nearest roads.. Thus there may be much easier "N+C Hypothetical Climb Trails", than the one I have shown.

As Previously Mentioned => A Complete Field Study Is Needed, to determine a good route here from WayPt N+C 26 to N+C 29, and then a decision as to the final "N+C Hypothetical Climb Trail”,
….An inexperienced person, not having a topo map, might well stumble onto a very difficult cliff, like the Narrator. There are plenty over this way. But with a Topo Map, the Narrator, even in his emotional condition, should have been able avoid such a disaster!
….My Hypothetical Climbing Trail Map (discussed in these photos) essentially shows a bumbling idiot’s way down. This does have a rugged cliff that is close enough to a major mountain stream to hear its roar. This is of course upper Hyalite Creek.

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(Photo = September2006 00159 ...... ZMM Page = 230 & 231 ...... Photo simulate WayPt = N+C 28 8200ft = 10.89 mi fm DeWeese.)