These students have been taught that their faith requires a literal interpretation of Bible passages which portray both a young earth and a world-wide deluge that reshaped the earth’s surface.
The rock layers above the Vishnu Complex and Supergroup are fairly flat. The next up, not labeled in the figure above, is the Bright Angel Shale.
This is relatively soft, so it crumbles back, leaving slopes of rocks trailing onto the Tapeats.
An alternate point of view is Young Earth (YE) Creationism.
YE creationists hold to a literal interpretation of the Bible, which does not adequately take into account the intent of the Scriptures or the historical circumstances of their authorship.
The low rainfall in the region reduces vegetative cover, so the colorful rock layers remain exposed to view.