Time and Change by John Burroughs — Read

The north side of the canyon has been much more deeply and elaborately carved than the south side; most of the great architectural features are on the north side -- the huge temples and fortresses and amphitheatres. The strata dip very gently to the north and northeast, while the slope of the surface is to the south and southeast. This has caused the drainage from the great northern plateaus to flow into the canyon and thus cut and carve the north side as we behold it.

The visitor standing upon the south side looks across the great chasm upon the bewildering maze of monumental forms, some of them as suggestive of human workmanship as anything in nature well can be, -- crumbling turrets and foundations, forms as distinctly square as any work of man's hands, vast fortress-like structures with salients and entering angles and wing walls resisting the siege of time, huge pyramidal piles rising story on story, three thousand feet or more above their foundations, each successive story or superstructure faced by a huge vertical wall which rises from a sloping talus that connects it with the story next below. The slopes or taluses represent the softer rock, the vertical walls the harder layers. Usually four or five of these receding stories make up each temple or pyramid. Some of the larger structures show all the strata from the cap of light Carboniferous limestone at the top to the gray Cambrian sandstone at the bottom. From others, such as the Temple of Isis, all the upper formations are gone with a pile of disintegrated red sandstone, like a mass of brick dust on the top where the fragment of the old red wall made its last stand. In those masses, which are still crowned with the light gray limestone, one sees how surely the process of disintegration is going on by the fragments and debris of light gray rock, like the chips of giant workmen, that strew the deeper-colored slopes below them. These fragments fade out as the eye drops down the slopes, as if they had melted like bits of ice. Indeed, the melting of ice and the dissolution of a rock do not differ much except that one is very rapid and the other infinitely slow.