The Treasure of Atlantis
"There was nothing to do but to make the best of it, and that meant getting under way. My rifles and ammunition were in the shelter, and one of the dogs had stayed behind. There was no use crossing the stream, for the opposing cliffs were sheer and apparently unscalable, though I thought I saw traces of a succession of rough steps that almost looked like masonry leading to a ledge halfway up the cliff. But there they ended definitely in a smooth wall. So I decided to follow the stream downward. It ran almost due northeast toward the Amazon, and I hoped that later it would widen and become navigable for a raft. Shorthanded as we were, that was a slim chance, but the only one in sight.
"It was useless to follow the carriers. The day was drawing to a close, and I determined to pass the night where we were. At sunset I heard a shout from the machete men, and found them groveling on the edge of the precipice. It was the mirage again, float