The walls were ragged, barren, and dreary, yet majestic.

We missed the numerous trees which in the upper canyons had been so ornamental wherever they could find a footing on the rocks.

Here there were only low shrubs as a rule and these mainly along the immediate edge of the water, though high up on north slopes pines began to appear.

Altitude, latitude, and aridity combine to modify vegetation so that in an arid region one notices extraordinary changes often in a single locality.

The walls still had the tendency to break into turrets and towers, and opposite our next camp a pinnacle stood detached from the wall on a shelf high above the water suggesting a beacon and it was named Lighthouse Rock.