Riders of the Purple Sage by Zane Grey

When the storm abated Venters sought his own cave, and late in the night, as his blood cooled and the stir and throb and thrill subsided, he fell asleep.

With the breaking of dawn his eyes unclosed. The valley lay drenched and bathed, a burnished oval of glittering green. The rain-washed walls glistened in the morning light. Waterfalls of many forms poured over the rims. One, a broad, lacy sheet, thin as smoke, slid over the western notch and struck a ledge in its downward fall, to bound into broader leap, to burst far below into white and gold and rosy mist.