Only an indistinct rattling of small rocks disturbed the impressive stillness.
It might have been the weathering that goes on constantly, and it might have been an animal.

I inclined to the former idea till I saw Satan's ears go up.

Jones had told me to watch the ears of my horse, and short as had been my acquaintance with Satan, I had learned that he always discovered things more quickly than I.So I waited patiently.
From time to time a rattling roll of pebbles, almost musical, caught my ear.

It came from the base of the wall of yellow cliff that barred the summit of all those ridges.

Satan threw up his head and nosed the breeze.