Funny. This map calls Clayton Ravine Shonash Ravine. That must be the old Indian name for it. It's perfect.
7 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:41:37.212 in the DVD version of the movie.
Quote context
[...]
- Theoretically speaking, could it be done?
- Tell me, when does the next train come through here?
- Right, Doc, but according to this map, there is no bridge.
- Well, Doc, we can scratch that idea.
- I mean, we can't wait a year and a half, for this thing to get finished.
[...]