What are the two rock units that the fault below the Cheops Pyramid formed between?

The correct choice identifies the two rock units between which the fault below the Cheops Pyramid formed as the Bright Angel Formation and the Dox Formation. This relationship is crucial because understanding the geological context of faults can provide insights into the tectonic processes that have shaped an area over geological time.

The Bright Angel Formation is a significant geological unit in the Grand Canyon area, primarily composed of sedimentary rock that formed in a fluvial environment. It is often characterized by its distinctive layering and fossil content, indicating its age and the conditions under which it was formed. The Dox Formation, on the other hand, consists of more recent sedimentary rocks that were deposited in different conditions compared to the Bright Angel Formation.

The presence of a fault between these two formations suggests a history of tectonic activity that may have caused displacement along the geological boundary. By recognizing the specific formations involved, geologists can piece together a more comprehensive picture of the area's geological history, including the forces that have influenced the landscape and the age of the formations relative to each other.

The other combinations of rock units listed involve formations or materials that either do not accurately reflect the geological context of the Cheops Pyramid or do not coincide with known formations in the area discussed. Thus, the identification of the