The Cutler Group is composed of (youngest to oldest):

White Rim Sandstone

Organ Rock Shale

Cedar Mesa Sandstone

Halgaito Shale/Lower Cutler Formation Each layer has different characteristics as streams, near-shore sand dunes and marine environments interfingered during deposition. However, to the northeast, these four elements cannot be distinguished and the Group is referred to as Cutler Undivided.