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The colors in the cliffs are created by the large amounts of minerals in the rock. The cliffs are composed of the Munising Formation of 500 million year old Cambrian period sandstone. The Munising Formation sits atop a Precambrian sandstone of the Jacobsville Formation. The mottled red Jacobsville Formation is the oldest rock in the park. On top of the Munising Formation is the younger Au Train Formation from the Ordovician period. The Au Train Formation is a hard sandstone and acts as a "cap" over the other layers. Streaks on the face of the cliffs come from the groundwater leaching out of the rock. With it come iron (red), manganese (black-white), limonite (yellow-brown), copper (pink-green) and other minerals. As the water evaporates, these minerals leave streaks of color.
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