The Fowkes Formation is an alluvial deposit, much like the Wasatch
Formation. The chemical and climatic conditions of deposition were
different from those of the Wasatch, and the extensive red-beds are not
developed.
Small lakes were present in which limestone and marlstone accumulated.
The puddingstone may be a mudflow. Volcanic activity left its record in
the ash found in the Fowkes Formation.
In the past, the Fowkes Formation had a greater distribution.
Postdepositional faulting down dropped parts of the Fowkes protecting
them from subsequent erosion.