The Cape Royal viewpoint is ~2.0 mi northeast; Dunn Butte is 2.0 north of the Colorado River, its drainage point.

The prominence geology of Dunn Butte is based on the massifs of Supai Group upon the cliff-former, (and therefore platform-former), of Redwall Limestone.

The Supai Group (and Redwall), massifs are also found on the parent (and connected landform), of Angels Gate, and neighboring butte northwest, Thor Temple.

The three prominence-bases of neighboring Angels Gate and Dunn Butte, and close by Thor Temple (northwest), are composed of Supai Group.

Unit 4, Supai, is the cliff-former, (and therefor platform-former), Esplanade Sandstone, that has a common, and sometimes thick presence, in nearly all regions of the Grand Canyon.